CN222636340U - A three-mode OLT optical device - Google Patents
A three-mode OLT optical device Download PDFInfo
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- CN222636340U CN222636340U CN202420860539.3U CN202420860539U CN222636340U CN 222636340 U CN222636340 U CN 222636340U CN 202420860539 U CN202420860539 U CN 202420860539U CN 222636340 U CN222636340 U CN 222636340U
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Abstract
The utility model belongs to the field of optical fiber communication and discloses a three-mode Optical Line Terminal (OLT) optical device which comprises a shell, an inserting core, an emitting tube core, a receiving tube core and an optical element arranged in the shell, wherein the inserting core, the emitting tube core and the receiving tube core are connected with the shell, the optical element comprises a filter plate group, the filter plate group is respectively arranged on an optical path between the emitting tube core and the inserting core and at a port of the receiving tube core, the total reflection plate group is arranged at a position opposite to the port of the receiving tube core, the filter plate group is matched with the total reflection plate group, and an optical signal emitted by the emitting tube core is guided into the inserting core and an optical signal emitted by the inserting core is guided into the receiving tube core.
Description
Technical Field
The utility model belongs to the field of optical fiber communication, and particularly relates to a three-mode Optical Line Terminal (OLT) optical device.
Background
With the improvement of industry digital transformation and broadband popularity and the deep acceleration of broadband, gigabit service and application scenes are continuously abundant, gigabit optical networks extend from the consumption field to the vertical industry field, thousands of industry digital transformation brings more demands and higher demands to the optical access network, gigabit optical access networks are used as the first jump entrance of connection plus computing power plus capacity, network basic capacities such as bandwidth, time delay and certainty of the optical access networks are required to be comprehensively improved, network perception and network slicing capacities are fused, the development and industry maturity of 50G-PON technology provide important schemes, compared with XGS-PON, the physical layer speed of 50G-PON technology is improved by 5 times as compared with that of XGS-PON, the time delay is reduced through a single-frame multi-burst and special registration windowing technology, the novel characteristics such as large bandwidth, low time delay and the like realized by 50G-PON technology can completely meet the demands of new service scenes such as 8-K, XR, internet, digital industry and the like on network access capacities in the future, the development of the network can be adapted to the development of the network industry, and the important reserve experience is realized as well as the future application needs of the future industry.
In the existing 50G-PON network, a three-mode Combo PON scheme is adopted, an OLT (optical line terminal) of the Combo PON is a six-port optical device, three sets of receiving and transmitting dies are integrated in one optical device, two groups of Z-BLOCK type wavelength division multiplexing components are arranged TO be coupled TO an output optical port in a combined mode, the optical path in the optical device is relatively complex, the receiving and transmitting dies of the Z-BLOCK type wavelength division multiplexing components adopt a TO packaging mode, the whole optical device is large in size and not suitable for high-density wiring and high-density circuit board design, if the transceiver adopts a BOX packaging mode with smaller size, the process accuracy requirement is high, the stability is not as high as that of the TO packaging mode, the manufacturing cost is high, the reworking is difficult, and the requirement of the 50G-PON network is difficult TO meet.
Disclosure of utility model
The utility model aims to solve the technical problems of large size and high manufacturing cost of an optical device in the prior art, and provides a three-mode OLT optical device.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
A three-mode OLT optical device comprises a shell, a ferrule connected with the shell, a transmitting tube core, a receiving tube core and an optical element arranged in the shell;
The optical element comprises a filter group, a first optical element and a second optical element, wherein the filter group is respectively arranged on an optical path between the transmitting tube core and the inserting core and at a port of the receiving tube core;
The filter sheet set is matched with the total reflection wave sheet set, so that the optical signals emitted by the emitting tube core are guided to the inserting core, and the optical signals emitted by the inserting core are guided to the receiving tube core.
The transmitting tube core comprises a shell, a first transmitting port, a second transmitting port and a second transmitting port, wherein the first transmitting port and the inserting core are respectively arranged on two opposite sides of the shell;
The second emission port is arranged on the upper surface of the shell and is close to the first emission port;
And the third emission port is arranged on the lower surface of the shell and is close to the first emission port.
Further, the receiving die comprises a first receiving port, a second receiving port and a first connecting piece, wherein the first receiving port is arranged on the upper surface of the shell and is close to the ferrule;
The second receiving port is arranged on the lower surface of the shell and is close to the ferrule;
And a third receiving port arranged on the lower surface of the shell and positioned between the third transmitting port and the second receiving port.
Further, the filter group comprises a first filter, a second filter and a third filter, wherein the first filter is arranged on the main optical path and is positioned right above the third emission port and used for guiding the optical signal emitted by the third emission port to the ferrule;
The second filter is arranged on the main optical path and is positioned right below the second emission port and used for guiding the optical signals emitted by the second emission port to the ferrule;
The third filter plate is arranged obliquely above the third receiving port;
the fourth filter plate is arranged obliquely above the third receiving port; the fourth filter plate is matched with the third filter plate and the total reflection plate group to guide the uplink optical signals to the third receiving port;
A fifth filter horizontally arranged right above the third receiving port for transmitting the optical signal with the specified wavelength to the third receiving port;
The sixth filter plate is obliquely arranged below the first receiving port, matched with the fourth filter plate and the total reflection filter plate group and used for guiding the uplink optical signals to the first receiving port and the second receiving port;
A seventh filter disposed between the first receiving port and the sixth filter for transmitting an optical signal of a specified wavelength to the first receiving port;
And the eighth filter is arranged above the second receiving port and is used for transmitting the optical signal with the specified wavelength to the second receiving port.
Further, the total reflection wave plate group comprises a first total reflection wave plate, a second total reflection wave plate and a third total reflection wave plate, wherein the first total reflection wave plate is arranged above the fifth wave plate and is used for reflecting an uplink optical signal to the third receiving port;
The second full-reflection wave plate is arranged obliquely below the fourth wave filter and used for reflecting the uplink optical signals to the first receiving port.
Further, the first emission port is a 50G-1342nm-EML+SOA laser, the second emission port is a 10G-1577nm-EML aspheric short focal length laser, and the third emission port is a 2.5G-1490nm-DFB laser.
Further, the first receiving port is a 25G-1286nm-APD photoelectric detector, the second receiving port is a 10G-1270nm-APD photoelectric detector, and the third receiving port is a 1.25G-1310nm-APD photoelectric detector.
Further, a lens group for converting the vergence of the optical signals is fixed in the shell.
Further, the second receiving port is fixed on the housing by adopting an inclination angle matched with the sixth filter.
The beneficial effects of the utility model are as follows:
The application provides a three-mode OLT optical device which supports the three-mode compatibility of 50G-PON, XGS-PON and GPON, wherein three generations of PON coexist on the same optical device, a user upgrades a terminal as required after one-time deployment of a network, the updating cost is reduced, the service is smoothly evolved, the high-speed and high-bandwidth data transmission is realized, and a filter group and a total reflection wave plate group are adopted in the optical device to guide an optical path, so that the optical device occupies a small volume, and the optical device is suitable for dense wiring and high-density circuit board design.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a three-mode OLT optical device according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of an internal structure of a three-mode OLT optical device according to an embodiment of the present utility model;
FIG. 3 is a schematic view of the position of an optical element in a housing according to an embodiment of the present utility model;
Fig. 4 is a schematic diagram of an optical path of a three-mode OLT optical device according to an embodiment of the present utility model.
The labels in the figures are as follows:
1. a housing;
2. A core insert;
3. an emitter die;
31. a first transmit port; 32, a second emission port, 33, a third emission port;
4. a receiving die;
41. First receiving port, 42, second receiving port, 43, third receiving port;
5. an optical element;
51. Filter group 511, first filter, 512, second filter, 513, third filter, 514, fourth filter, 515, fifth filter, 516, sixth filter, 517, seventh filter, 518, eighth filter, 52, total reflection filter group 521, first total reflection filter, 522, second total reflection filter, 53, lens group 531, first lens, 532, second lens, 533, third lens, 534, fourth lens, 535, fifth lens, 541, first optical isolator, 542, second optical isolator.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present utility model) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "fixed" may be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Examples
The embodiments of the present application shown in fig. 1 to 4 provide a three-mode OLT optical device, which is connected in practical application in an optical port or an optical fiber interface card slot of a device, to provide high-speed optical fiber transmission capability for the device, and includes a housing 1, a ferrule 2, a transmitting die 3, a receiving die 4, and an optical element 5.
Referring to fig. 1 and 2, the whole casing 1 is in a cuboid structure, a containing cavity 11 is formed in the casing 1 along the length direction, a plurality of mounting holes are formed in the surface of the casing 1 and are used for fixing the ferrule 2, the transmitting tube core 3 and the receiving tube core 4 respectively, the axes of the mounting holes are located in the same plane and are communicated with the containing cavity 11, so that light beams emitted by the ferrule 2 and the transmitting tube core 3 are also located in the same plane, a light path is simplified, the number of the mounting holes is seven, one mounting hole located on the side surface of the casing 1 is used for fixing the ferrule 2, three mounting holes located on the upper surface and the lower surface of the casing 1 and close to the ferrule 2 are used for fixing the receiving tube core 4, and the other three mounting holes are used for fixing the transmitting tube core 3, so that requirements of three-generation PON coexistence are met.
In order to meet the coexistence requirement of the third-generation PON, the ferrule 2 adopts a single-fiber multi-direction ferrule adapter, and can couple laser emitted by a plurality of emitting tube cores 3 into the same optical fiber, or couple laser transmitted by the same optical fiber to a plurality of receiving tube cores 4 respectively, so as to receive downlink wavelengths of GPON, XGS-PON and 50G-PON systems and emit uplink wavelengths of three wave bands.
In the technical scheme, the transmitting tube core 3 comprises a first transmitting port 31, a second transmitting port 32 and a third transmitting port 33, wherein the first transmitting port 31 is arranged in a mounting hole on the side face of the shell 1 and is opposite to the inserting core 2, by adopting the technical scheme, an optical signal transmitted by the first transmitting port 31 can be directly transmitted into the inserting core 2, the second transmitting port 32 is arranged in a mounting hole on the upper surface of the shell 1 and is close to the first transmitting port 31, the third transmitting port 33 is arranged in a mounting hole on the lower surface of the shell 1 and is close to the first transmitting port 31, and the optical signals transmitted by the second transmitting port 32 and the third transmitting port are transmitted into the inserting core 2 through adjustment of the optical element 5.
The receiving tube core 4 comprises a first receiving port 41, a second receiving port 42 and a third receiving port 43, wherein the first receiving port 41 is arranged in a mounting hole of the upper surface of the shell 1, which is close to the inserting core 2, the second receiving port 42 is arranged in a mounting hole of the lower surface of the shell 1, which is close to the inserting core 2, the third receiving port 43 is arranged on the lower surface of the shell 1 and is fixed in the mounting hole between the third transmitting port 33 and the second receiving port 42, the optical signals emitted by the inserting core 2 are respectively injected into the first receiving port 41, the second receiving port 42 and the third receiving port 43 after being regulated by the optical element 5, and by adopting the technical scheme, the optical device is provided with three receiving ports which can be respectively used for finishing the receiving tasks of uplink wave segments of GPON, XGS-PON and 50G-PON systems.
Referring to fig. 2 to 4, the optical element 5 may be fixed inside the housing 1 by gluing, and includes a filter group 51 and a total reflection wave plate group 52, where the filter group 51 may reflect the optical signals with the specified wavelength and the other wavelengths, so as to mainly perform a filtering function, and the total reflection wave plate group 52 may reflect the optical signals with all wavelengths, so as to mainly perform a function of changing the wavelength transmission direction, and the filter group 51 and the total reflection wave plate group 52 cooperate to guide the optical signals emitted by the emitting die 3 into the ferrule 2, and guide the optical signals emitted by the ferrule 2 into the receiving die 4.
More specifically, the filter set 51 includes a first filter 511, a second filter 512, a third filter 513, a fourth filter 514, a fifth filter 515, a sixth filter 516, a seventh filter 517 and an eighth filter 518, where the first filter 511 is disposed on a straight-through main optical path at an inclination angle of 45 ° and is located directly above the third emission port 33, so that the optical signal emitted from the first emission port 31 can pass through the first filter 511, and the optical signal emitted from the third emission port 33 is reflected by the first filter 511 and then is directed to the direction of the ferrule 2, and it can be understood that the inclination angle of the first filter 511 can also be adjusted according to the change of the positional relationship between the third emission port 33 and the first filter 511, so that the optical signal emitted from the third emission port 33 is reflected to the direction of the ferrule 2.
The second filter 512 is disposed on the straight-through main optical path at an inclination angle of 45 ° and is located under the second emission port 32, the second filter 512 can enable the optical signals emitted from the second emission port 32 to be reflected by the second filter 512 towards the ferrule 2 through the optical signals emitted from the first emission port 31 and the third emission port 33, and it can be understood that the inclination angle of the second filter 512 can be adjusted according to the change of the positional relationship between the second emission port 32 and the second filter 512 so that the optical signals emitted from the second emission port 32 are reflected towards the ferrule 2.
The third filter 513 and the fourth filter 514 are respectively arranged above the third receiving port 43 in an inclined angle, the fifth filter 515 is a light-transmitting filter which is horizontally arranged right above the third receiving port 43 and below the third filter 513 and the fourth filter 514, in the technical scheme, the third filter 513 and the fourth filter 514 can transmit optical signals emitted by the first transmitting port 31, the second transmitting port 32 and the third transmitting port 33, the third filter 513, the fourth filter 514 and the total reflection filter group 52 are matched, part of optical signals with wavelengths emitted by the ferrule 2 can be guided into the third receiving port 43, and the fifth filter 515 is designed to filter optical signals with other wavelengths and keep the optical signals with specified wavelengths to transmit into the third receiving port 43.
The optical signals with partial wavelengths emitted by the ferrule 2 are reflected by the fourth filter 514 and the total reflection plate set 52 and then emitted to the sixth filter 516, the sixth filter 516 transmits the optical signals with the appointed wavelengths, and the rest optical signals with the wavelengths are reflected to the second receiving port 42;
The seventh filter 517 adopts a light-transmitting filter, which is horizontally fixed under the first receiving port 41 and above the sixth filter 516, and the seventh filter 517 is designed to filter out other wavelength light signals and retain the light signals with a specified wavelength to transmit to the first receiving port 41.
The eighth filter 518 is a light-transmitting filter, and is fixed above the second receiving port 42, and is used for filtering out optical signals with other wavelengths, and retaining the optical signals with specified wavelengths to transmit into the first receiving port 41.
The total reflection plate set 52 includes a first total reflection plate 521 and a second total reflection plate 522, where the first total reflection plate 521 is obliquely fixed above the third filter 513, the fourth filter 514, and the fifth filter 515, and the first total reflection plate 521 is used to reflect the optical signal reflected by the third filter 513 again and make it emit to the third receiving port 43.
The second total reflection plate 522 is obliquely fixed below the fourth filter 514, and the second total reflection plate 522 is used for reflecting the optical signal reflected by the fourth filter 514 again, so that the optical signal is emitted to the second receiving port 42.
Compared with the prior art that a plurality of groups of Z-BLOCK wavelength division multiplexing components are arranged in the optical device, the optical element 5 in the three-mode OLT optical device provided by the application has the advantages that the optical element 5 utilizes the filter group 51 and the total reflection filter group 52 to guide optical signals, the internal structure is more compact, the optical path is simpler, and therefore, the occupied volume of the optical device is smaller, and the optical device is more suitable for the design of high-density wiring and high-density circuit boards.
In a preferred embodiment of the present application, the second receiving port 42 is disposed at a small angle on the metal housing 1, and is used to cooperatively receive the optical signal reflected by the sixth filter 516, so that the optical signal reflected by the sixth filter 516 can be directly transmitted into the second receiving port 42, and the optical signal received and transmitted by the ferrule 2 is split by the filter group 51 and the total reflection sheet group 52, which are inclined on the optical path inside the housing 1, so that effective isolation can be formed between the 50G-PON, XGS-PON and GPON optical paths, and crosstalk between the optical signals is reduced.
As a preferred embodiment of the present application, the first transmitting port 31 is a transmitting port of a 50G-PON system, which adopts a 50G-1342nm-EML+SOA laser (1342 SOA EML TO) for transmitting a 1342nm wavelength optical signal of a 50G-PON downlink, which can meet the requirement of high power, the second transmitting port 32 is a transmitting port of an XGS-PON system, which adopts a 10G-1577nm-EML aspheric short focal length laser (1577 EML TO) for transmitting a 1577nm wavelength optical signal of the XGS-PON downlink, and the third transmitting port 33 is a transmitting port of a GPON system, which adopts a 2.5G-1490nm-DFB laser (1490 DFB) for transmitting a 1490nm wavelength optical signal of the GPON downlink.
The first receiving port 41 is a receiving port of a 50G-PON system, which adopts a 25G-1286nm-APD photo detector (25G APD TO) for receiving 1286nm wavelength optical signals of the 50G-PON system, the second receiving port 42 is a receiving port of an XGS-PON system, which adopts a 10G-1270nm-APD photo detector (10G APD TO) for receiving 1270nm wavelength optical signals of the XGS-PON system, the third receiving port 43 is a receiving port of a GPON system, which adopts a 1.25G-1310nm-APD photo detector (1.25G APD TO) for receiving 1310nm wavelength optical signals of the GPON system, and the 1.25G-1310nm-APD photo detector is a small-size cap package, the design further reduces the external dimension of the receiving die 4 and is suitable for QSFP module package, and in the technical scheme, the receiving die 4 adopts a flat window package form compared with a BOX package, the scheme has lower manufacturing cost, the bias of the BOX package process cap is avoided, and the light coupling efficiency is improved.
It will be appreciated that in the above embodiments, the first filter 511 transmits only optical signals having a wavelength of 1342nm, the second filter 512 transmits only optical signals having a wavelength of 1342nm and 1490nm, the third filter 513 transmits only optical signals having a wavelength of 1342nm, 1490nm and 1577nm, the fourth filter 514 transmits only optical signals having a wavelength of 1342nm, 1490nm, 1577nm and 1310nm, the fifth filter 515 transmits only optical signals having a wavelength of 1310nm, the sixth filter 516 and the seventh filter 517 transmit only optical signals having a wavelength of 1286nm, and the eighth filter 518 transmits only optical signals having a wavelength of 1270 nm.
In a preferred embodiment of the present application, a lens group 53 is fixed in the housing 1, and the lens group 53 includes a first lens 531, a second lens 532, a third lens 533, a fourth lens 534 and a fifth lens 535, wherein the first lens 531 is located on a main optical path between the second filter 512 and the third filter 513 and is used for converting three wavelengths of converging optical signals 1342nm, 1490nm and 1577nm into parallel beams so as to prolong an optical path, the second lens 532 is located at a port of the ferrule 2 and is used for converting optical signals transmitted and received by the ferrule 2, the third lens 533 is located between the sixth filter 516 and the first receiving port 41, the fourth lens 534 is located between the eighth filter 518 and the second receiving port 42, the fifth lens 535 is located between the fifth filter 515 and the third receiving port 43, a deviation of a die capping process can be avoided when the receiving die 4 and the lens group 53 are combined, a coupling efficiency index can be improved, and the design of the lens group 53 can also effectively solve the problem that the ferrule 2 and the transmitting die 3 are easy to short, and the optical signals cannot enter the receiving die 4.
In this embodiment, a first optical isolator 541 and a second optical isolator 542 are fixed in the housing 1, where the first optical isolator 541 is located between the first emission port 31 and the first filter 511, and the second optical isolator 542 is located between the second emission port 32 and the second filter 512, and the first optical isolator 541 and the second optical isolator 542 are configured to reduce light reflected back to the emission die 3, so as to reduce noise and nonlinear distortion of the laser, avoid adverse effects on the light source or the optical path system, and help to reduce power loss caused by stimulated brillouin scattering, and prevent reflected light from affecting stability of the system.
Working principle:
When a 50G-PON single-fiber bidirectional data link is used according TO network selection needs, a 1342SOA EML TO drive sends out a 50G optical signal, the optical signal passes through a first optical isolator 541 (forward light passes through and is isolated by reverse light), the forward light passes through a filter plate group 51 and a lens group 53 with specific wavelengths, and is converted into an electric signal TO be output in an optical fiber reaching the ferrule 2, an uplink speed 24.8832Gbps corresponding TO the 50G-PON is reached, when the optical device receives an optical signal of 1286nm transmitted from the ferrule 2, the optical path is switched through reflection of a fourth filter plate 514 and a second full-reflection filter plate 522, transmission of a sixth filter plate 516 and a seventh filter plate 517 is carried out, and the optical signal reaches 25G APD TO TO be converted into the electric signal, and the optical signal is compatible with 12.4416Gbps.
According TO network selection requirement, when an XGS-PON single-fiber bidirectional data link in the device is used, 1577EML TO drives and sends out 10G optical signals, the optical signals pass through a second optical isolator 542 (forward light passes through and reverse light is isolated), the forward light passes through a filter group 51 and a lens group 53 with specific wavelengths, and is converted into electric signals TO be output in the optical fibers reaching the ferrule 2, the corresponding up-going speed of the XGS-PON is 9.95328/2.48832Gbps, and when the optical devices receive 1270nm optical signals transmitted from the ferrule 2, the optical paths are switched through reflection of a fourth filter 514, a second total reflection filter 522 and a sixth filter 516, and transmission of an eighth filter 518 is switched TO reach 10G APD TO and are converted into electric signals.
When GPON single-fiber bidirectional data link is used according TO network selection requirement, 1490DFB drives TO send out 2.5G optical signals, the optical signals are forward transmitted through filter plate group 51 and lens group 53 with specific wavelength TO reach optical fiber of ferrule 2 and converted into electric signals, uplink speed 1.24416Gbps corresponding TO GPON is achieved, when optical devices receive 1310nm optical signals transmitted from ferrule 2, transmission of fourth filter plate 514 and fifth filter plate 515 is achieved through the devices, reflection of third filter plate 513 and first total reflection plate 521 is conducted on optical paths, 1.25G APD TO is achieved, and the optical devices with the functions of photoelectric/electro-optical conversion of 50G-PON, XGS-PON and GPON are integrated, and therefore various network application requirements in different markets are met.
The application provides a three-mode OLT optical device which supports the three-mode compatibility of 50G-PON, XGS-PON and GPON, wherein three generations of PON coexist on the same optical device, a user upgrades a terminal as required after one-time deployment of a network, the updating cost is reduced, the service is smoothly evolved, the high-speed and high-bandwidth data transmission is realized, and the optical device adopts a filter group 51 and a full-reflection wave group 52 to guide optical signals, so that the optical device occupies small volume and is suitable for dense wiring and high-density circuit board design.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (9)
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| CN202420860539.3U CN222636340U (en) | 2024-04-24 | 2024-04-24 | A three-mode OLT optical device |
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| CN202420860539.3U CN222636340U (en) | 2024-04-24 | 2024-04-24 | A three-mode OLT optical device |
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