CN102136876B - Light line protection acceleration circuit, light line protection system and method - Google Patents
Light line protection acceleration circuit, light line protection system and method Download PDFInfo
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- CN102136876B CN102136876B CN201110036195.1A CN201110036195A CN102136876B CN 102136876 B CN102136876 B CN 102136876B CN 201110036195 A CN201110036195 A CN 201110036195A CN 102136876 B CN102136876 B CN 102136876B
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Abstract
The invention discloses a light line protection acceleration circuit, a light line protection system and method. The light line protection acceleration circuit comprises a light power detection circuit and a switching-off controller, wherein the light power detection circuit is used for detecting light power output by a first light path and a second light path, the first light path is the current working channel of the light line protection system, and the second light path is a standby working channel of the light line protection system; and the switching-off controller is used for switching off the first light path so that the first light path stays in the loss of signal warning state if the light power detection circuit detects that the light power output by the first light path is smaller than the light power output by the second light path and the difference value between the light power output by the second light path and the light power output by the first light path is greater than a switching-off threshold value. In the embodiment of the invention, when smaller attenuation occurring in the current working channel reaches the switching-off threshold value, the first light path can be switched off so as to switch the current working channel from the first light path to the second light path, and the quick switching of the current working channel is realized.
Description
Technical field
The embodiment of the present invention relates to light path resist technology field, particularly relates to a kind of Optical Line Protection accelerating circuit, optical link protecting system and method.
Background technology
Optical Line Protection (Optical Line Protection; Be called for short: OLP) veneer is for building the subsystem carrying out automatic switching protection based on optical link, OLP veneer has 6 optical ports usually, as shown in Figure 1a, for the structural representation of existing optical link protecting system, OLP veneer function in light path generally includes: the light entered by port Tx divides equally output (two) by T1, T2 two-way; Select a road from the light of R1, R2 two-way input, export (choosing is received) through port Rx.When optical fiber/optical cable primary on optical link surprisingly fracture or performance degradation time; under optical link automatic switching protection equipment or systemic effect; switched by switch; automatically primary for optical transmission line route optical fiber/lightguide cable link can be switched to spare fibre/lightguide cable link at the appointed time, realize the normal operation of optical transport.For Fig. 1 a, when master channel interrupts, downstream website such as: wavelength division multiplexing (Wavelength Division Multiplexing; Be called for short: WDM)/synchronous digital hierarchy (Synchronous Digital Hierarchy; Be called for short: the primary light signal that SDH)/router (Router) network etc. receives is lost, trigger optical switch and start handover operation, now the optical switch at two ends be all switched to receive alternate channel light signal (Fig. 1 a at the middle and upper levels system to the passage of downstream website, R2 can be switched to from R1), thus ensure that upper system is as the normal operation of WDM/SDH/ router network.Except the OLP system of two fine two-way (a pair optical fiber) of above-mentioned introduction, the principle of up-downgoing different wave length can be utilized, an optical fiber also can be adopted to build single fiber bi-directional OLP system.
Generally, Optical Line Protection switching time requires as being not more than 50ms, and Optical Line Protection can be divided into following two kinds of application scenarioss:
Scene one, power amplifier section route protection
As shown in Figure 1 b, be the schematic diagram of existing a kind of power amplifier section route protection, by each wdm system website such as: multiplexing (the Optical Terminal Multiplexer of optical terminus; Be called for short: OTM) website (as: between OTM website A and OTM website B) or light amplification (Optical LineAmplifier; Be called for short: OLA) website (as: between OA website 1 and OA website 2) increases OLP veneer, can realize the OLP protection of each luminous power being amplified to section, this protected mode also can provide OLP protection piecemeal for chain SDH system.Each luminous power amplifies primary, spare channel optical cable parameter index needs close (length, attenuation, dispersion etc.) that section adopts, OLP luminous power is two to be sent out, an active and standby routing power all declines, and then follow-up OLP switches repeatedly, causes business to reach 1 second complete recovery time.
Scene two, optical multiplexing section route protection
As illustrated in figure 1 c; for the schematic diagram of existing a kind of optical multiplexing section route protection; OLP equipment is increased by the OTM website (as: between OTM website A and OTM website B) at wdm system; and set up standby usage passage, the OLP of multiplex section is protected, in this case: wdm system is each has power fade margin across section; when optical fiber Insertion Loss becomes large; when exceeding this power attenuation allowance thresholding, business has started to occur error code, the situations such as LOF.But; if be configured with circuit 1+1 protection in wdm system to switch; the switching standards of optical receiving end OLP veneer is that the power difference of the primary channel of test point is greater than certain value (as 5dB); but it is more apart from the power amplifier number of this test point; the decay that optical fiber Insertion Loss needs is larger, and optical fiber Insertion Loss is greater than the OLP board switchover of certain value (i.e. optical fiber Insertion Loss attenuation threshold) ability trigger downstream website.Therefore; if optical fiber abnormity point is more from the power amplifier number of test point, optical fiber Insertion Loss attenuation threshold may be greater than power attenuation allowance thresholding, then when the value of optical fiber Insertion Loss attenuation is in the middle of these two thresholdings; the OLP veneer of light-receiving list cannot be switched, and defencive function lost efficacy.Switch if pull out fibre, because power drop needs the time, the time between 2 power threshold may more than 50ms, and at this moment business board break period will be long, causes protection switch time more than 50ms.
In sum, prior art is when optical link breaks down, and Optical Line Protection switching time is long.
Summary of the invention
The invention provides a kind of Optical Line Protection accelerating circuit, optical link protecting system and method, to break down line protection reverse time in time long defect in order to solve optical link in prior art, realize switching fast of Optical Line Protection.
The embodiment of the present invention provides a kind of Optical Line Protection accelerating circuit, it is characterized in that, comprising:
Luminous power testing circuit, for detecting the luminous power that the first light path and the second light path export, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system;
Turn off control unit, if detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit, then described first light path is turned off, make described first light path be in lossing signal alarm status.
The embodiment of the present invention also provides a kind of optical link protecting system, comprising: light transmitting terminal and optical receiving end, and described smooth transmitting terminal and optical receiving end are connected a switching control circuit separately; At least one Optical Line Protection accelerating circuit is comprised between the switching control circuit that described smooth transmitting terminal and optical receiving end connect;
Described smooth transmitting terminal is connected with described optical receiving end by described Optical Line Protection accelerating circuit, and form the first light path and the second light path, described first light path is work at present passage, and described second light path is service aisle for subsequent use;
Described Optical Line Protection accelerating circuit comprises: luminous power testing circuit and shutoff control unit;
Described luminous power testing circuit, for detecting the luminous power that the first light path and the second light path export, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system;
Described shutoff control unit, if detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit, then described first light path is turned off, make described first light path be in lossing signal alarm status;
Described switching control circuit, if be in lossing signal alarm status for described first light path, then by work at present passage from described first optical path switching to described second light path.
The embodiment of the present invention provides a kind of Optical Line Protection method, comprising:
The luminous power that the first light path between Optical Line Protection accelerating circuit detection light transmitting terminal and optical receiving end and the second light path export, described smooth transmitting terminal connects and composes described first light path and described second light path by described Optical Line Protection accelerating circuit and described optical receiving end, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system;
If the luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value; then described first light path turns off by Optical Line Protection accelerating circuit; after making described first light path be in lossing signal alarm status, the switching control circuit that described smooth transmitting terminal is connected with optical receiving end by work at present passage from the first optical path switching to the second light path.
Optical Line Protection accelerating circuit provided by the invention, optical link protecting system and method; when the less decay that work at present passage occurs reaches shutoff threshold value; first light path can be turned off; the current switching of the first light path is made to be in lossing signal alarm (LOS) state; the luminous power of the reception of optical receiving end is made to rapidly drop to the level that can trigger; thus work at present passage is switched to the second light path from the first light path, realize switching fast of work at present passage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 a is the structural representation of existing optical link protecting system;
Fig. 1 b is the schematic diagram of existing a kind of power amplifier section route protection;
Fig. 1 c is the schematic diagram of existing a kind of optical multiplexing section route protection;
The schematic diagram of the Optical Line Protection accelerating circuit that Fig. 2 a provides for the embodiment of the present invention one;
The schematic diagram of the example one of control unit is turned off in the Optical Line Protection accelerating circuit that Fig. 2 b provides for the embodiment of the present invention one;
Fig. 2 c comprises the schematic diagram of power amplifier for Optical Line Protection accelerating circuit that the embodiment of the present invention one provides;
The schematic diagram of the example two of control unit is turned off in the Optical Line Protection accelerating circuit that Fig. 2 d provides for the embodiment of the present invention one;
The schematic diagram of the optical link protecting system that Fig. 3 a provides for the embodiment of the present invention two;
Fig. 3 b is that optical multiplexing section route protection light is put number and triggers the attenuation corresponding relation schematic diagram switched;
Fig. 3 c is the schematic diagram that optical multiplexing section route protection is switched fast;
The schematic diagram of effect is switched in the optical link protecting system that Fig. 3 d provides for the embodiment of the present invention two;
The schematic diagram of the Optical Line Protection method that Fig. 4 provides for the embodiment of the present invention three.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
The schematic diagram of the Optical Line Protection accelerating circuit that Fig. 2 a provides for the embodiment of the present invention one, as shown in Figure 2 a, this Optical Line Protection accelerating circuit comprises:
Luminous power testing circuit 21, for detecting the luminous power that the first light path and the second light path export, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system; Quick poll can be adopted to detect (ms level), the luminous power that the first light path, the second light path export is detected respectively.
Turn off control unit 23, if detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit 21, then described first light path is turned off, make described first light path be in lossing signal alarm status.
Wherein, turn off control unit specific implementation and can adopt following example:
Example one, shutoff control unit can adopt optical switch (Optical Switches; Be called for short: OSW) realize.
The schematic diagram of the example one of control unit is turned off in the Optical Line Protection accelerating circuit that Fig. 2 b provides for the embodiment of the present invention one, as shown in Figure 2 b, turn off control unit 23 comprise the first optical switch OSW1, the second optical switch OSW2 and turn off controller (not shown);
The input RI11 of described first optical switch OSW1 and output RO1 is connected on described first light path M1, and the unglazed end RI12 of described first optical switch OSW1 opens a way;
The input RI21 of described second optical switch OSW2 and output RO2 is connected on described second light path M2, and the unglazed end RI22 of described second optical switch OSW2 opens a way;
Described shutoff controller, if detect for described luminous power testing circuit, the difference of the luminous power of described second optical switch OSW2 and described first optical switch OSW1 is greater than shutoff threshold value, then closed by the output RO1 of described first optical switch OSW1 and unglazed end RI12.
Particularly, under initial condition, the input RI11 and the output RO1 that turn off the first optical switch OSW1 of control unit close, and the input RI21 of the second optical switch OSW2 and output RO2 closes.Because the unglazed end RI12 of the first optical switch OSW1 and the unglazed end RI12 of the second optical switch OSW2 can not connect input (namely unglazed), if a certain moment, luminous power testing circuit detects that the luminous power of the first optical switch OSW1 output is less than the luminous power of the second optical switch OSW2 output, and the difference of the luminous power of the second optical switch OSW2 and the first optical switch OSW1 (i.e. the luminous power that exports of the second light path M2 and the first light path M1 export the difference of luminous power) is greater than and turns off threshold value such as: during 5dB, turn off controller the output RO1 of the first optical switch OSW1 and unglazed end RI12 to be closed, the first light path is made to turn off and be in lossing signal alarm (LOS) state.The output RO1 of the first optical switch OSW1 and unglazed end RI12 is closed, the first light path can be made to turn off, thus accelerator downstream fast detecting is in lossing signal alarm (LOS) state to the first light path, thus the optical power change of main optical path is delivered to rapidly downstream website (such as: the Optical Line Protection accelerating circuit in optical receiving end or downstream), the processing time of each optical switch is short, fast work at present passage can be switched to the second light path M2 from the first light path M1 at optical receiving end, such as: the processing time of each optical switch is about 1 millisecond (ms), such as: 30 websites are divided into 5 sections, 5 Optical Line Protection accelerating circuits can be set, overall switching time can be met the requirement of 50 milliseconds.
Further; Optical Line Protection accelerating circuit can be provided with power amplifier; as shown in Figure 2 c; the Optical Line Protection accelerating circuit provided for the embodiment of the present invention one comprises the schematic diagram of power amplifier; each optical switch of Optical Line Protection accelerating circuit can connect a power amplifier respectively; due to the route stand-by effect of power amplifier, can guarantee that route stand-by is independent.Wherein, first light path M1 accesses the input RI11 of the first optical switch OSW1; what input the unglazed end RI12 of the first optical switch OSW1 does not take over; the output RO1 of the first optical switch OSW1 is received in power amplifier OA1 corresponding in the first light path; and the downstream website (directly can connect the OLP veneer of the first light path M1 at optical receiving end 13, also can connect the OLP veneer of the first light path M1 at optical receiving end 13 by several Optical Line Protection accelerating circuit) of the first light path M1 is connected by power amplifier OA1.Second light path M2 accesses the output RI21 of the second optical switch OSW2; what input the unglazed end RI22 of the second optical switch OSW2 does not take over; the power amplifier OA2 receiving correspondence on the second light path M2 of the output RO2 of the second optical switch OSW2; and the downstream website (directly can connect the OLP veneer of the second light path M2 at optical receiving end 13, also can connect the OLP veneer of the second light path M2 at optical receiving end 13 by several Optical Line Protection accelerating circuit) of the second light path M2 is connected by power amplifier OA2.
As shown in Figure 2 c, during initialization, the input RI11 of the first optical switch OSW1 all on the first light path M1 and output R01 closes, the input RI21 of the second optical switch OSW2 all on the second light path M2 and output RO2 closes, and distinguish closed communicating on the first light path M1 at the OLP veneer of light transmitting terminal 11 and optical receiving end 13, make the first light path M1 be work at present passage.If the first light path M1 decay becomes large, such as: the luminous power coincidence formula on the first optical switch OSW1 and the second optical switch OSW2 detected: P (RI21)-P (RI11) > 5dB, then the first optical switch OSW1 closes from the closed output R01 and unglazed end RI12 that is switched to of input RI11 and output R01, thus the luminous power of the first light path M1 is declined fast, the optical switch OSW on the OLP veneer of the optical receiving end 13 being finally switches to the second light path M2 from the first light path M1 rapidly.
If example two Optical Line Protection accelerating circuit comprises power amplifier, turn off control unit and can also pass through software simulating, such as: if turn off control unit also detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit, then turn off the laser of the power amplifier of described first light path; Or, reduce the driver current of the power amplifier of described first light path, make the power amplifier of described first light path turn off and be in lossing signal alarm status; Or, turn off described first light path by wavelength-selective switches.
Further, turn off control unit can also be used for: if described luminous power testing circuit detects that luminous power that the second light path exports is less than luminous power that the first light path exports and the difference of luminous power that described first light path and described second light path export is greater than shutoff threshold value, then described second light path is turned off, make described second light path be in lossing signal alarm status.Thus when comparatively large-signal decay also occurs the second light path, the second light path is turned off, prevents from switching by mistake or switching back and forth.
Wherein, the schematic diagram of the example two of control unit is turned off in the Optical Line Protection accelerating circuit that Fig. 2 d provides for the embodiment of the present invention one, as shown in Figure 2 d, the shutoff control unit in website can be arranged on system communication and control (system control and Communication; Be called for short: SCC) on unit or other veneer entities, can communicate with power amplifier fast, obtain instant luminous power, and be handed down to power amplifier fast to control laser.In SCC, increase a software module can realize, compared with example one, can not optical switch be increased, but utilize SCC to the fast light power detection of the power amplifier OA1 of the first light path M1 and the power amplifier OA2 of the second light path M2.If a certain Optical Line Protection accelerating circuit occurs that the optical power down of the optical power ratio second light path M2 of the first light path M1 is more, exceed shutoff threshold value, shutoff control unit then in SCC can turn off the laser of the power amplifier OA1 of the first corresponding light path M1, or reduce the driver current of the power amplifier OA1 of the first light path M1, or the power shutdown function of power amplifier OA1 of the first light path M1 is realized by light crossover device such as WSS, appointment amplifier (i.e. the power amplifier OA1 of the first light path M1) Output optical power is finally made to decline rapidly, thus make the first light path M1 turn off and be in lossing signal alarm (LOS) state.
Further; in order to recover normally in the first light path; can work at present passage be switched in the first light path rapidly; by work at present passage from the first optical path switching to the second light path after; through the closing time of setting, the first light path can also be closed, therefore; as shown in Figure 2 a, this Optical Line Protection accelerating circuit 15 can also comprise:
Closed control unit 27, if described first light path turned off for described shutoff control unit, makes the first light path be in lossing signal alarm status, then through the closing time of setting, described first light path is closed; If described second light path turns off by described shutoff control unit, make the second light path be in lossing signal alarm status, then through the closing time of setting, described second light path is closed.Closed control unit 27 can after the lower passage of switch-off power, automatic or manually light path is again communicated with, and again enters preparation switch status, to switch next time.
The present embodiment is when the less decay that work at present passage occurs reaches shutoff threshold value, first light path can be turned off, make currently to switch to lossing signal alarm (LOS) state, the luminous power that optical receiving end is received rapidly drops to the level that can trigger, thus work at present passage is switched to the second light path from the first light path, realize switching fast of work at present passage.
Embodiment two
The schematic diagram of the optical link protecting system that Fig. 3 a provides for the embodiment of the present invention two, as shown in Figure 3 a, this optical link protecting system can comprise: light transmitting terminal 11 and optical receiving end 13, light transmitting terminal 11 is connected a switching control circuit 17 separately with optical receiving end 13, comprises at least one Optical Line Protection accelerating circuit 15 between the switching control circuit 17 that light transmitting terminal and optical receiving end connect; Wherein, the structure of this Optical Line Protection accelerating circuit 15 can adopt any one structure in embodiment one, and light transmitting terminal and light transmitting terminal can be OTM website etc.
Wherein, light transmitting terminal 11 is connected with optical receiving end 13 by described Optical Line Protection accelerating circuit 15, forms the first light path M1 and the second light path M2, and described first light path M1 is work at present passage, and described second light path M2 is service aisle for subsequent use; If the first light path is the current main service aisle of acquiescence, then the first light path also can be called main optical path, and the second light path also can be called standby light path.
Described Optical Line Protection accelerating circuit 15, for detecting the luminous power that described first light path M1 and described second light path M2 exports, if the luminous power that the first light path M1 exports is less than luminous power that the second light path M2 exports and the difference of luminous power that described second light path M2 and described first light path M1 exports is greater than shutoff threshold value, then described first light path M1 is turned off, make described first light path be in lossing signal alarm (LOS) state;
Described switching control circuit 17, if be in lossing signal alarm (LOS) state for described first light path M1, is then switched to described second light path M2 by work at present passage from described first light path M1.
Further; in order to prevent switching and switching back and forth when decay appears in the second light path by mistake; Optical Line Protection accelerating circuit also for: if the luminous power that the second light path exports is less than luminous power that the first light path exports and the difference of luminous power that described first light path and described second light path export is greater than shutoff threshold value; then described second light path is turned off, make described second light path be in lossing signal alarm status.
Fig. 3 b is that optical multiplexing section route protection light is put number and triggers the attenuation corresponding relation schematic diagram switched; Fig. 3 c is the schematic diagram that optical multiplexing section route protection is switched fast; in order to solve the problem of standby usage channel switching time length, a kind of method is: networking diagram is revised as Fig. 3 c from Fig. 1 c.Every certain across section (such as: Fig. 1 d limits across in section), configure the acceleration that an OLP single-chip protection carries out route protection.Another situation, when application scenarios one, is revised as Fig. 3 c by networking diagram from Fig. 1 b.Configure across section (such as: Fig. 1 d limits across in section) acceleration that an OLP single-chip protection carries out route protection every certain, the main optical path that the standby light path of power amplifier and power amplifier are set up in this amendment requirement is completely independent.Although Fig. 3 c carries out an optical multiplexing section route protection at interval of several sections, can reduce and certain switch number of times, switch moment at optical switch, two channel services are all lossing signal alarm (Lost Of Signal; Be called for short: LOS) state, the 1+1 protection switch status of downstream website is all chaotic, and switching time, still at about 1 second, does not reach the requirement of 50ms.
The schematic diagram of effect is switched in the optical link protecting system that Fig. 3 d provides for the embodiment of the present invention two, as shown in Figure 3 d, compared with Fig. 3 c, in the embodiment of the present invention, Optical Line Protection accelerating circuit is not owing to being that OLP light splitting sends, route stand-by has independent OA, power does not affect by the changed power of main optical path, what can solve the light section of putting route protection frequently switches problem, protection switch time is end to end made to meet 50 milliseconds of requirements, and the use amount of OLP veneer can be saved without the need to increasing OLP veneer (only need arrange OLP veneer in first place as switching control circuit).Such as: if the point of interruption distance test point of Fig. 1 c system (as 15 sections of optical fiber) has 15 sections of optical fiber; according to every 5 sections, an Optical Line Protection accelerating circuit is set; the point of interruption only has 5 sections from the test point accelerated; and within 5 sections; if main optical path decay reaches threshold value; the Optical Line Protection accelerating circuit of this section cuts out main optical path at once, and the route stand-by luminous power producing very high attenuation simultaneously at the corresponding levels is constant, and the downstream power of route stand-by is therefore unaffected.And the very high attenuation of Work route makes next stage Optical Line Protection accelerating circuit start at once, the like, the same point of interruption, can activating light road protection system switch at once, thus ensures that switching time is up to standard.If do not have accelerator as illustrated in figure 1 c, with reference to figure 1d when from test point 7 sections, Line Attenuation will reach 16dB, just can switch at test point.Due to service disconnection when Line Attenuation reaches 8.5dB, so sustained traffic break period will more than 50mS
The present embodiment is when the less decay that work at present passage occurs reaches shutoff threshold value, first light path can be turned off, thus make currently to switch to los state, the power amplifier response in downstream is very fast, thus the luminous power making the OLP veneer of downstream optical receiving end receive rapidly drops to the level that can trigger, work at present passage is switched to the second light path from the first light path, realizes switching fast of work at present passage.
Embodiment three
The schematic diagram of the Optical Line Protection method that Fig. 4 provides for the embodiment of the present invention three, as shown in Figure 4, this Optical Line Protection method comprises:
The luminous power that the first light path between step 101, Optical Line Protection accelerating circuit detection light transmitting terminal and optical receiving end and the second light path export, described smooth transmitting terminal connects and composes described first light path and described second light path by described Optical Line Protection accelerating circuit and described optical receiving end, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system;
If the luminous power that step 102 first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value; then described first light path turns off by Optical Line Protection accelerating circuit; after making described first light path be in lossing signal alarm status, the switching control circuit that described smooth transmitting terminal is connected with optical receiving end by work at present passage from the first optical path switching to the second light path.
Further; in order to prevent switching and switching back and forth when decay appears in the second light path by mistake; if the luminous power that the second light path exports is less than luminous power that the first light path exports and the difference of luminous power that described first light path and described second light path export is greater than shutoff threshold value; then described second light path turns off by Optical Line Protection accelerating circuit, makes described second light path be in lossing signal alarm status.
Wherein, in a step 102, if the difference of luminous power that the second light path and the first light path export is greater than shutoff threshold value, the mode that the first light path turns off can be comprised following example:
Example one, shutoff control unit are realized by optical switch, such as: see Fig. 2 b, turn off control unit and comprise the first optical switch, the second optical switch and turn off controller; The two ends of described first optical switch are connected in described first light path, the unglazed end open circuit of described first optical switch; The two ends of described second optical switch are connected in described second light path, the unglazed end open circuit of described second optical switch;
In example one, described first light path is turned off and is specially: the output of described first optical switch and unglazed end are closed.
In addition, see Fig. 2 c, the first light path between Optical Line Protection accelerating circuit and described optical receiving end and the second light path are respectively arranged with power amplifier, due to power amplifier its Output optical power synchronous change quickly when inputting fast-changing.Thus the LOS that optical switch causes, also can be diminished by the output of power amplifier and be delivered to next accelerator or last OLP test point very soon;
Example two, shutoff control unit pass through software simulating, like this, described first light path is turned off and is specially: if described luminous power testing circuit detects that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value, then turn off the laser of the power amplifier of described first light path; Or, reduce the driver current of the power amplifier of described first light path, the power amplifier of described first light path is turned off; Or by the optical module that can turn off light path of other kinds, such as wavelength-selective switches (WSS) turns off described first light path.
Further, in order to first light path recover normal time can work at present passage be switched in the first light path rapidly, by work at present passage from the first optical path switching to the second light path after, through setting closing time, by closed in the first light path, can also be specially:
If described first light path turns off by described shutoff control unit, make the first light path be in lossing signal alarm status, then through the closing time of setting, described first light path is closed; If described shutoff control unit will turn off, make described second light path be in lossing signal alarm status, then through the closing time of setting, described second light path will be closed.
The present embodiment is when the less decay that work at present passage occurs reaches shutoff threshold value, first light path can be turned off, thus make currently to switch to los state, the power amplifier response in downstream is very fast, thus the luminous power making the OLP veneer of downstream optical receiving end receive rapidly drops to the level that can trigger, work at present passage is switched to the second light path from the first light path, realizes switching fast of work at present passage.In addition, because the luminous power of service aisle for subsequent use does not change, power amplifier also can not action, can prevent last OLP veneer from occurring switching by mistake, thus shorten switching time, switching time can be controlled within 50ms.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. an Optical Line Protection accelerating circuit, is characterized in that, comprising:
Luminous power testing circuit, for detecting the luminous power that the first light path and the second light path export, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system;
Turn off control unit, if detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit, then described first light path is turned off, make described first light path be in lossing signal alarm status, and make optical receiving end that work at present passage is switched to described second light path from described first light path; Wherein, described shutoff control unit comprises the first optical switch, the second optical switch and turns off controller;
The input of described first optical switch and output are connected in described first light path, the unglazed end open circuit of described first optical switch;
The input of described second optical switch and output are connected in described second light path, the unglazed end open circuit of described second optical switch;
Described shutoff controller, if detect that the luminous power of the first optical switch output is less than the luminous power of the second optical switch output and the difference of the luminous power of described second optical switch and described first optical switch is greater than shutoff threshold value for described luminous power testing circuit, then the output of described first optical switch and unglazed end are closed.
2. Optical Line Protection accelerating circuit according to claim 1, is characterized in that, Optical Line Protection accelerating circuit is provided with power amplifier.
3. Optical Line Protection accelerating circuit according to claim 2, is characterized in that:
Described shutoff control unit, if also detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit, then turn off the laser of the power amplifier of described first light path; Or, reduce the driver current of the power amplifier of described first light path, the power amplifier of described first light path is turned off; Or, turn off described first light path by wavelength-selective switches.
4. an optical link protecting system, is characterized in that, comprising: light transmitting terminal and optical receiving end, and described smooth transmitting terminal and optical receiving end are connected a switching control circuit separately; At least one Optical Line Protection accelerating circuit is comprised between the switching control circuit that described smooth transmitting terminal and optical receiving end connect;
Described smooth transmitting terminal is connected with described optical receiving end by described Optical Line Protection accelerating circuit, and form the first light path and the second light path, described first light path is work at present passage, and described second light path is service aisle for subsequent use;
Described Optical Line Protection accelerating circuit comprises: luminous power testing circuit and shutoff control unit;
Described luminous power testing circuit, for detecting the luminous power that the first light path and the second light path export, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system;
Described shutoff control unit, if detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit, then described first light path is turned off, make described first light path be in lossing signal alarm status, and make optical receiving end that work at present passage is switched to described second light path from described first light path;
Described switching control circuit, if be in lossing signal alarm status for described first light path, then by work at present passage from described first optical path switching to described second light path;
Wherein, described shutoff control unit comprises the first optical switch, the second optical switch and turns off controller;
The input of described first optical switch and output are connected in described first light path, the unglazed end open circuit of described first optical switch;
The input of described second optical switch and output are connected in described second light path, the unglazed end open circuit of described second optical switch;
Described shutoff controller, if detect that the luminous power of the first optical switch output is less than the luminous power of the second optical switch output and the difference of the luminous power of described second optical switch and described first optical switch is greater than shutoff threshold value for described luminous power testing circuit, then the output of described first optical switch and unglazed end are closed.
5. optical link protecting system according to claim 4, is characterized in that:
Described shutoff control unit, if also detect that luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value for described luminous power testing circuit, then turn off the laser of the power amplifier of described first light path; Or, reduce the driver current of the power amplifier of described first light path, the power amplifier of described first light path is turned off; Or, turn off described first light path by wavelength-selective switches.
6. an Optical Line Protection method, is characterized in that, comprising:
The luminous power that the first light path between Optical Line Protection accelerating circuit detection light transmitting terminal and optical receiving end and the second light path export, described smooth transmitting terminal connects and composes described first light path and described second light path by described Optical Line Protection accelerating circuit and described optical receiving end, described first light path is the work at present passage of optical link protecting system, and described second light path is the service aisle for subsequent use of optical link protecting system;
If the luminous power that the first light path exports is less than luminous power that the second light path exports and the difference of luminous power that described second light path and described first light path export is greater than shutoff threshold value, then described first light path turns off by Optical Line Protection accelerating circuit, after making described first light path be in lossing signal alarm status, the switching control circuit that described smooth transmitting terminal is connected with optical receiving end by work at present passage from the first optical path switching to the second light path; Wherein, the shutoff control unit of described Optical Line Protection accelerating circuit comprises the first optical switch, the second optical switch and turns off controller; The two ends of described first optical switch are connected in described first light path, the unglazed end open circuit of described first optical switch; The two ends of described second optical switch are connected in described second light path, the unglazed end open circuit of described second optical switch;
Described described first light path shutoff is specially: the output of described first optical switch and unglazed end are closed; Or, turn off the laser of the power amplifier of described first light path; Or, reduce the driver current of the power amplifier of described first light path, the power amplifier of described first light path is turned off; Or, turn off described first light path by wavelength-selective switches; Wherein, the first light path between described Optical Line Protection accelerating circuit and described optical receiving end and the second light path are respectively arranged with described power amplifier.
7. Optical Line Protection method according to claim 6, is characterized in that, also comprise:
If the luminous power that the second light path exports is less than luminous power that the first light path exports and the difference of luminous power that described first light path and described second light path export is greater than shutoff threshold value; then described second light path turns off by Optical Line Protection accelerating circuit, makes described second light path be in lossing signal alarm status.
8. the Optical Line Protection method according to claim 6 or 7, is characterized in that, also comprise:
If described first light path turns off by the shutoff control unit of described Optical Line Protection accelerating circuit, then through the closing time of setting, described first light path closes by Closed control unit; If described second light path turns off by the shutoff control unit of described Optical Line Protection accelerating circuit, then through the closing time of setting, described second light path closes by Closed control unit.
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| CN104301026B (en) * | 2013-07-17 | 2016-12-28 | 中国电信股份有限公司 | Image intensifer and fibre circuit guard method thereof |
| CN103795458A (en) * | 2013-11-27 | 2014-05-14 | 国家电网公司 | Optical fiber switching protection system and control method thereof |
| CN104301032A (en) * | 2014-10-29 | 2015-01-21 | 国家电网公司 | Optical line automatic switching protection system |
| US9766403B2 (en) * | 2015-07-07 | 2017-09-19 | Huawei Technologies Co., Ltd. | Apparatus and method for tuning and switching between optical components |
| US9703048B2 (en) | 2015-07-07 | 2017-07-11 | Huawei Technologies Co., Ltd. | Apparatus and method for tuning optical components |
| CN107294596B (en) * | 2016-03-30 | 2019-12-17 | 青岛海信宽带多媒体技术有限公司 | Optical signal processing method in optical module and optical network unit |
| CN106059657A (en) * | 2016-05-20 | 2016-10-26 | 烽火通信科技股份有限公司 | Optical link protection system integrated with optical time domain reflectometer |
| CN106059658A (en) * | 2016-08-15 | 2016-10-26 | 桂林创研科技有限公司 | Optical line protection system |
| CN110870231A (en) * | 2017-07-19 | 2020-03-06 | 华为技术有限公司 | Method, device and system for selecting wavelength |
| CN110995336B (en) * | 2019-11-15 | 2021-05-11 | 武汉光迅信息技术有限公司 | OLP transmission link switching method and device, storage medium and OLP |
| CN110933533B (en) * | 2019-11-18 | 2022-07-01 | 中通服咨询设计研究院有限公司 | Optical path backup method and device |
| CN111327976B (en) * | 2020-03-27 | 2021-10-15 | 国网河南省电力公司信息通信公司 | A kind of optical fiber communication network protection circuit |
| CN114826389B (en) * | 2022-04-27 | 2024-04-19 | 浙江广联有线电视传输中心 | Optical cable line safety level assessment method and assessment system thereof |
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