CN102377480B - Evaluating method and parameter testing method for optical equipment of dense wavelength division multiplexing (DWDM) system - Google Patents
Evaluating method and parameter testing method for optical equipment of dense wavelength division multiplexing (DWDM) system Download PDFInfo
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- CN102377480B CN102377480B CN201010254329.2A CN201010254329A CN102377480B CN 102377480 B CN102377480 B CN 102377480B CN 201010254329 A CN201010254329 A CN 201010254329A CN 102377480 B CN102377480 B CN 102377480B
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Abstract
The invention discloses an evaluating method and a parameter testing method for optical equipment of a dense wavelength division multiplexing (DWDM) system and provides a standard parameter and an evaluating method for the optical equipment of the DWDM system as well as a testing method for the parameter. The evaluating method for the optical equipment comprises the following steps of: determining a phase parameter testing value of the optical equipment to be evaluated; comparing the phase parameter testing value with a phase parameter threshold; and evaluating whether the optical equipment is available or not. The parameter testing method comprises the following steps of: adjusting the phase parameter of the optical equipment within the determined channel frequency range; and when the transmission performance of the system is ensured, taking the phase parameter at the time as a first phase parameter threshold for evaluating the optical equipment within the channel frequency range.
Description
Technical field
The present invention relates to optical communication field, particularly relate to the assessment of dense wavelength division multiplexing system light device and parameter test method.
Background technology
Along with the growth of communication bandwidth, optical transmission system development rapidly.At present, dense wave division multipurpose (DWDM, the Dense Wavelength Division Multiplexing) system of single channel rate 40Gb/s, frequency interval 50GHz is commercial.Because speed increases, as 40Gb/s speed, OOK (on-off keying) modulation system transmission impairment is originally comparatively large, applies limited, and DPSK (differential phase-shift keying (DPSK)) or DQPSK (the strong control of difference four phase orthogonal phase shift) equiphase modulation system is generally used.This phase modulation method of business carries, and the optical filter parameter of equipment is larger to systematic influence.Originally at the light device that 10Gb/s system can normally work, when transmitting 40Gb/s, the normal work of system can not be ensured.
Group delay (the Group delay of the 50GHz comb optical filter (interleaver) shown in Fig. 1, GR) compose, this device can ensure system worked well in 10Gb/S system, but will introduce excessive cost, system cisco unity malfunction in 40Gb/s system.
Suitable parameter is not also found to carry out specification high speed dense wave division multipurpose (DWDM) system light device (mainly referring to optical filter) at present.
Summary of the invention
The technical problem to be solved in the present invention is to provide the assessment of a kind of dense wavelength division multiplexing system light device and parameter test method, for dwdm system light device provides the method for testing of standard parameter and appraisal procedure and this parameter.
For solving the problems of the technologies described above, the invention provides a kind of dense wavelength division multiplexing system light device appraisal procedure, comprising:
Determine the phase parameter test value of light device to be assessed, described phase parameter test value and phase parameter threshold value are compared, assess described light device and whether can use.
Further, describedly determine that the step of the phase parameter test value of light device to be assessed comprises: the channel frequence scope determining described light device, then determine the phase parameter test value within the scope of this channel frequence.
Further, described phase parameter threshold value adopts following methods to obtain: within the scope of the channel frequence determined, regulate the phase parameter of light device, when the transmission performance of system is ensured, using the first phase parameter threshold described channel frequence within the scope of of phase parameter now as the described light device of assessment.
Further, regulate the spectral width of single channel flank speed light signal, it is made to be greater than the described channel frequence scope determined, heighten channel frequence scope, now regulate the phase parameter of light device, when the transmission performance of system is ensured, using the second phase parameter threshold current channel frequency range in of phase parameter now as the described light device of assessment.
Further, described described phase parameter test value and phase parameter threshold value to be compared, whether can with refer to: described phase parameter test value and described first phase parameter threshold are compared, to assess the transmission performance whether described light device can ensure system if assessing described light device.
Further, described described phase parameter test value and phase parameter threshold value to be compared, whether can with refer to: described phase parameter test value and described first phase parameter threshold are compared if assessing described light device, described phase parameter test value and described second phase parameter threshold are compared, to assess the transmission performance whether described light device can ensure system.
Further, described phase parameter comprises group delay flatness (GDR) value and/or phase place flatness (PR) value.
Further, described light device comprises: optical filter, optical terminus multiplexer (OTM), optical add/drop multiplexer (OADM) or reconstructable OADM equipment (ROADM).
For solving the problems of the technologies described above, present invention also offers a kind of dense wavelength division multiplexing system light device parameter test method, comprising:
Within the scope of the channel frequence determined, regulate the phase parameter of light device, when the transmission performance of system is ensured, using the first phase parameter threshold described channel frequence within the scope of of phase parameter now as the described light device of assessment.
Further, regulate the spectral width of single channel flank speed light signal, it is made to be greater than the described channel frequence scope determined, heighten channel frequence scope, now regulate the phase parameter of light device, when the transmission performance of system is ensured, using the second phase parameter threshold current channel frequency range in of phase parameter now as the described light device of assessment.
Further, described phase parameter comprises group delay flatness (GDR) value and/or phase place flatness (PR) value.
Further, described transmission performance is weighed by one or more in following parameter: optical signal-noise-rate penalty (OSNR Penalty), the error rate (BER).
Adopt the method for the invention, compared with prior art, due to channel frequence scope (channel frequency range) is combined with group delay, thus solve an assessment difficult problem for dense wavelength division multiplexing system light device mass parameter, improve system level, avoid Practical Project system and occur that light device phase parameter is undesirable and the problem causing system cisco unity malfunction, improve system transfers reliability.
Under the method for the invention scene that namely single channel rate is higher in high speed DMDW system, have more meaning.
Accompanying drawing explanation
Fig. 1 is a kind of insertion loss (Insertion loss) spectrum and group delay spectrogram of 50GHz comb optical filter;
Fig. 2 is embodiment of the present invention light device appraisal procedure flow chart.
Embodiment
The invention provides a kind of appraisal procedure of light device: the phase parameter test value determining light device to be assessed, described phase parameter test value and phase parameter threshold value are compared, assess described light device and whether can use.
Describedly determine that the step of the phase parameter test value of light device to be assessed comprises: the channel frequence scope determining described light device, then determine the phase parameter test value within the scope of this channel frequence.Described light device channel frequence scope obtains by the frequency range reading the upper substantially flat position of insertion loss spectrum.The phase parameter within the scope of this channel frequence of described light device is determined by following methods: the group delay from the group delay spectrum of described light device in fetch channel frequency range, from the group delay within the scope of channel frequence, read phase parameter.
Described phase parameter threshold value adopts following methods to obtain: within the scope of the channel frequence determined, regulate the phase parameter of light device, when the transmission performance of system is ensured, using the first phase parameter threshold described channel frequence within the scope of of phase parameter now as the described light device of assessment.The described channel frequence scope determined refers to the channel frequence scope meeting system transfers performance.
Preferably, regulate the spectral width of single channel flank speed light signal, it is made to be greater than the described channel frequence scope determined, heighten channel frequence scope, now regulate the phase parameter of light device, when the transmission performance of system is ensured, using the second phase parameter threshold current channel within the scope of of phase parameter now as the described light device of assessment.
Described described phase parameter test value and phase parameter threshold value to be compared, whether can with refer to: described phase parameter test value and described first phase parameter threshold are compared, to assess the transmission performance whether described light device can ensure system if assessing described light device.
Preferably, described phase parameter test value and phase parameter threshold value to be compared, whether can with refer to: described phase parameter test value and described first phase parameter threshold are compared if assessing described light device, described phase parameter test value and described second phase parameter threshold are compared, to assess the transmission performance whether described light device can ensure system.When phase parameter test value can meet the requirement of second phase parameter threshold, represent its transmission performance that still can ensure system when the optical signal rate higher (being greater than " the channel frequence scope determined ") inputted.
Preferably, described phase parameter comprises group delay flatness (Group Delay Ripple, GDR) value and/or phase place flatness (Phase Ripple, PR) value.
Described transmission performance is weighed by one or more in following parameter: optical signal-noise-rate penalty (OSNRPenalty, Optical Signal to Noise Ratio Penalty), the error rate (BER, Bit Error Ratio).
Described light device comprises: optical filter, optical terminus multiplexer (OTM), optical add/drop multiplexer (OADM) or reconstructable OADM equipment (ROADM).
The present invention is using the mass parameter of the phase parameter of channel frequence scope as described equipment, and the light device for high speed DWDM provides new standard parameter.Determine phase parameter by the joint passage frequency range and group delay, propose easy reliable phase parameter appraisal procedure.
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme:
Fig. 1 is a kind of insertion loss spectrum and group delay spectrum of 50GHz optical filter.The centre wavelength of filter shown in figure is 1534.64nm, and channel frequence scope is 1534.64 ± 0.08nm, and within the scope of this channel frequence, group delay is uneven.
Experimental result, this optical filter is suitable for the transmission that single channel flank speed is the 50GHzDWDM system of 10Gb/s, but is unsuitable for the transmission that single channel flank speed is the 50GHz dwdm system of 40Gb/s.
Fig. 2 is light device threshold testing method flow diagram of the present invention.Comprise the steps:
The first step, by light device connecting system, simulates the operational environment of this light device, and ensures that the channel frequence scope of this light device is in the scope of system transfers performance requirement;
Light device channel frequence scope obtains by the frequency range reading the upper substantially flat position of insertion loss spectrum.
Hereinafter this channel frequence scope is called Src Chan frequency range.
Second step, regulates the phase parameter of this light device to ensure system transfers performance, and the phase parameter determining now is the phase parameter threshold value in Src Chan frequency range, i.e. first threshold;
The method of light device phase parameter is regulated to adopt existing techniques in realizing.
Group delay from the group delay spectrum of described light device in fetch channel frequency range, phase parameter is read from the group delay within the scope of channel frequence, comprise group delay flatness (Group Delay Ripple, GDR) value and/or phase place flatness (Phase Ripple, PR) value, regulates described phase parameter to ensure dwdm system transmission performance.
Transmission performance is weighed by one or more in following parameter: optical signal-noise-rate penalty (OSNRPenalty, Optical Signal to Noise Ratio Penalty), the error rate (BER, Bit Error Ratio).Described guarantee system transfers performance is the requirement of instigating system transfers performance can reach default, and one or more namely in above-mentioned parameter reach threshold requirement.
3rd step, regulate the spectral width of this light device single channel flank speed light signal of input, it is made to be greater than Src Chan frequency range, Src Chan frequency range is regulated to obtain current channel frequency range (i.e. N Src Chan frequency range doubly, N is frequency range parameter, N be greater than 1 real number), regulate the phase parameter of this light device to ensure system transfers performance, the phase parameter determining now is the phase parameter in current channel frequency range, i.e. Second Threshold.
The measured value that the phase parameter that table 1 and table 2 are respectively 50GHz interval light filter is GDR and phase parameter when being PR and the comparison sheet of threshold value, wherein, N=2, g1, g2, p1, p2 are phase parameter threshold value, are positive number, and g2 >=g1, p2 >=p1.
Table 1
Table 2
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (10)
1. a dense wavelength division multiplexing system light device appraisal procedure, comprising:
Determine the phase parameter test value of light device to be assessed, described phase parameter test value and phase parameter threshold value are compared, assess described light device and whether can use; If described phase parameter test value is less than described phase parameter threshold value, commenting described light device can use;
Describedly determine that the step of the phase parameter test value of light device to be assessed comprises: the channel frequence scope determining described light device, then the phase parameter test value within the scope of this channel frequence is determined, the channel frequence scope of described light device is obtained by the frequency range reading the upper substantially flat position of insertion loss spectrum, group delay from the group delay spectrum of described light device in fetch channel frequency range, reads phase parameter from the group delay within the scope of channel frequence;
Described phase parameter threshold value adopts following methods to obtain: within the scope of the channel frequence determined, regulate the phase parameter of light device, when the transmission performance of system is ensured, using the first phase parameter threshold described channel frequence within the scope of of phase parameter now as the described light device of assessment.
2. the method for claim 1, is characterized in that:
Regulate the spectral width of single channel flank speed light signal, it is made to be greater than the described channel frequence scope determined, heighten channel frequence scope, now regulate the phase parameter of light device, when the transmission performance of system is ensured, using the second phase parameter threshold current channel frequency range in of phase parameter now as the described light device of assessment.
3. the method for claim 1, is characterized in that:
Described described phase parameter test value and phase parameter threshold value to be compared, whether can with refer to: described phase parameter test value and described first phase parameter threshold are compared, to assess the transmission performance whether described light device can ensure system if assessing described light device; If described phase parameter test value is less than described first phase parameter threshold, comment the transmission performance that described light device can ensure system.
4. method as claimed in claim 2, is characterized in that:
Described described phase parameter test value and phase parameter threshold value to be compared, whether can with refer to: described phase parameter test value and described first phase parameter threshold are compared if assessing described light device, described phase parameter test value and described second phase parameter threshold are compared, to assess the transmission performance whether described light device can ensure system; If described phase parameter test value is less than described first phase parameter threshold, and described phase parameter test value is less than described second phase parameter threshold, then comment the transmission performance that described light device can ensure system; Described first phase parameter threshold is less than or equal to described second phase parameter threshold.
5. the method according to any one of claim 1-4, is characterized in that:
Described phase parameter comprises group delay flatness GDR value and/or phase place flatness PR value.
6. the method according to any one of claim 1-4, is characterized in that:
Described light device comprises: optical filter, optical terminus multiplexer OTM, optical add/drop multiplexer OADM or reconstructable OADM equipment ROADM.
7. a dense wavelength division multiplexing system light device parameter test method, comprising:
Within the scope of the channel frequence determined, regulate the phase parameter of light device, when the transmission performance of system is ensured, using the first phase parameter threshold described channel frequence within the scope of of phase parameter now as the described light device of assessment;
Determine the phase parameter test value of light device to be assessed, described phase parameter test value and phase parameter threshold value are compared, assess described light device and whether can use;
Describedly determine that the step of the phase parameter test value of light device to be assessed comprises: the channel frequence scope determining described light device, then the phase parameter test value within the scope of this channel frequence is determined, the channel frequence scope of described light device is obtained by the frequency range reading the upper substantially flat position of insertion loss spectrum, group delay from the group delay spectrum of described light device in fetch channel frequency range, reads phase parameter from the group delay within the scope of channel frequence;
Described phase parameter threshold value adopts following methods to obtain: within the scope of the channel frequence determined, regulate the phase parameter of light device, when the transmission performance of system is ensured, using the first phase parameter threshold described channel frequence within the scope of of phase parameter now as the described light device of assessment.
8. method as claimed in claim 7, is characterized in that:
Regulate the spectral width of single channel flank speed light signal, it is made to be greater than the described channel frequence scope determined, heighten channel frequence scope, now regulate the phase parameter of light device, when the transmission performance of system is ensured, using the second phase parameter threshold current channel frequency range in of phase parameter now as the described light device of assessment.
9. method as claimed in claim 7 or 8, is characterized in that:
Described phase parameter comprises group delay flatness GDR value and/or phase place flatness PR value.
10. method as claimed in claim 7 or 8, is characterized in that:
Described transmission performance is weighed by one or more in following parameter: optical signal-noise-rate penalty OSNR Penalty, error rate BER.
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| US7340166B1 (en) * | 2004-07-15 | 2008-03-04 | Verizon Services Corp. | Methods and apparatus for automated testing and analysis of dense wavelength division multiplexing (DWDM), wavelength selective and/or optical switching devices |
| CN101145838A (en) * | 2006-09-13 | 2008-03-19 | 中兴通讯股份有限公司 | A method for obtaining DWDM system optical S/N ratio |
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