CN210666094U - Multi-wavelength splitting receiving module - Google Patents
Multi-wavelength splitting receiving module Download PDFInfo
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- CN210666094U CN210666094U CN201921576329.7U CN201921576329U CN210666094U CN 210666094 U CN210666094 U CN 210666094U CN 201921576329 U CN201921576329 U CN 201921576329U CN 210666094 U CN210666094 U CN 210666094U
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- wavelength division
- division multiplexing
- wavelength
- photoelectric detector
- demultiplexing
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Abstract
A receiving module of multi-wavelength division comprises a first photoelectric detector, a second photoelectric detector, a third photoelectric detector, a fourth photoelectric detector, a fifth photoelectric detector, a sixth photoelectric detector, a seventh photoelectric detector and an eighth photoelectric detector, a wavelength division demultiplexing component, an input end, a collimating lens and a converging lens group. The wavelength division demultiplexing component demultiplexes input light to obtain first, second, third, fourth, fifth, sixth, seventh and eighth optical signals. The converging lens group is matched with each optical signal and converged to the photoelectric detector of the corresponding channel for receiving. The utility model provides a receiving module group of multi-wavelength branch wave utilizes wavelength division demultiplexing subassembly to carry out the light path folding, can realize advantages such as less size, lower loss, less volume, higher integrated level.
Description
Technical Field
The utility model relates to an optical fiber communication technical field especially relates to a receiving module of multi-wavelength branch wave.
Background
As the development of optical fiber communication is rapid, the maximum utilization of the width of the optical fiber is directly required along with the increase of the requirement of single optical fiber transmission capacity (such as video image transmission). Wavelength Division Multiplexing (WDM) technology is one of the key technologies for increasing transmission capacity. The WDM system multiplexes a plurality of optical signals having different wavelengths from each other. In recent years, there has been a demand for WDM optical modules, and for example, there is known a TOSA in which four CAN packages accommodating LDs (laser diodes) are arranged in a line in the same direction as a TOSA used for an optical module having a light emitting module that wavelength-multiplexes optical signals of different wavelengths emitted from a plurality of light sources. On the other hand, in recent years, further miniaturization of optical modules such as optical transceivers has been demanded. For example, a small-sized optical transceiver corresponding to QSFP + (small Form-factor plug Plus), which is a transceiver specification corresponding to an optical fiber connected at 40 to 100GbE, is required, and a small-sized optical transceiver for WDM is particularly required.
The LAN-WDM standard, which is currently in practical use in bulk, multiplexes four optical signals each having a transmission speed of 25Gbps per wavelength and a bandwidth of 800GHz to realize a transmission capacity of 100 Gbps. The wavelengths of the corresponding optical signals are 1295.56nm, 1300.05nm, 1304.58nm and 1309.14 nm. The optical transceiver specified in the LAN-WDM draft has external dimensions that comply with the CFP (100G pluggable) multi-source agreement (MSA). However, it is highly desirable to further reduce the size and cost of the optical transceiver in order to install the optical transceiver in the communication device with high density. A new standard has been developed to establish 8 channels of optical signals spaced about 4.5nm apart, with a total of 5 wavelengths of 1273.55nm, 1277.89nm, 1282.26nm, 1286.66nm, 1291.10nm, and the inner 4 of them being used.
Similarly, there is a CWDM4 standard with a channel spacing of 20nm, corresponding to optical signals with wavelengths of 1271nm, 1291nm, 1311nm and 1331 nm. New standards have been developed to establish optical signals with 8 channels spaced 20nm apart, increasing 1351nm, 1371nm, 1391nm, 1411 nm.
In the system, the multiplexing of multiple wavelengths is needed, and the demultiplexing of the multiple wavelengths is needed. Demultiplexing is more difficult than multiplexing because it requires processing of full polarization states.
Currently, as shown in fig. 1, in a conventional optical module for multi-wavelength demultiplexing, an optical signal input from an input end includes four optical signals λ 1, λ 2, λ 3, and λ 4, so as to implement demultiplexing. The method comprises the following specific steps: the optical signal λ 1 is transmitted through the wavelength division multiplexing film 21 and then received by the first detector 11; the remaining λ 2, λ 3, λ 4 are reflected by the wavelength division multiplexing diaphragm 21, and then reach the wavelength division multiplexing diaphragm 22, and the optical signal λ 2 is reflected by the wavelength division multiplexing diaphragm 22 and then received by the second detector 12; the remaining λ 3 and λ 4 are transmitted by the wavelength division multiplexing diaphragm 22 and then reach the wavelength division multiplexing diaphragm 23, and the optical signal λ 3 is reflected by the wavelength division multiplexing diaphragm 23 and then received by the third detector 13; the remaining λ 4 is transmitted through the wavelength division multiplexing diaphragm 23 and reaches the wavelength division multiplexing diaphragm 24, and the optical signal λ 4 is reflected by the wavelength division multiplexing diaphragm 24 and received by the third detector 14, thereby completing the demultiplexing process of four wavelengths. However, the wavelength intervals of the four optical signals are narrow, so that the wavelength division multiplexing films 21, 22, 23, and 24 are difficult to coat, the cost is very high, and even coating manufacturers cannot realize the coating. Even if the wavelength division multiplexing films are commercially available, the sensitivity to incident angles is high due to the narrow pass band width, the insertion loss is large, and the performance index is inevitably affected.
With respect to the solution of fig. 1, an improved solution is shown in fig. 2, and the incident angle of the wavelength division multiplexing film is changed from 45 ° in fig. 1 to 13.5 °, 13 °, or even 10 ° or 8 ° to reduce the difficulty of coating. The method comprises the following specific steps: the input optical signals comprise four optical signals of lambda 1, lambda 2, lambda 3 and lambda 4, and are incident on the wavelength division multiplexing membrane 25 through the substrate 29, and the optical signals lambda 1 are transmitted through the wavelength division multiplexing membrane 25 and then received by the first detector 11; λ 2, λ 3, λ 4 are reflected by the wavelength division multiplexing diaphragm 25, and then reflected by the HR surface of the substrate 29, and then enter the wavelength division multiplexing diaphragm 26, and the optical signal λ 2 is transmitted by the wavelength division multiplexing diaphragm 26 and then received by the second detector 12; λ 3 and λ 4 are reflected by the wavelength division multiplexing diaphragm 26, and then reflected by the HR surface of the substrate 29, and enter the wavelength division multiplexing diaphragm 27, and the optical signal λ 3 is transmitted by the wavelength division multiplexing diaphragm 27 and then received by the third detector 13; λ 4 is reflected by the wavelength division multiplexing film 27, and then reflected by the HR surface of the substrate 29, and enters the wavelength division multiplexing film 28, and the optical signal λ 4 is transmitted by the wavelength division multiplexing film 28 and then received by the fourth detector 14, thereby completing demultiplexing. The structure solves the problem of producibility of the filter, but because the wavelength interval of four optical signals is narrow and the incident angle is still small, the optical path is longer, the sensitivity to the incident angle is high, the insertion loss is large, the optical path coupling is not easy to control, and the overall structure is large.
The utility model provides a pair of receiving module of multi-wavelength branch wave utilizes wavelength to divide demultiplexing subassembly to carry out the light path folding, can realize advantages such as less size, lower loss, less volume, higher integrated level.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a receiving module of multi-wavelength branch wave utilizes the wavelength division to demultiplex the subassembly, carries out the light path folding, can realize advantages such as less size, lower loss, less volume, higher integrated level.
The technical scheme of the utility model lies in:
the utility model provides a receiving module of multi-wavelength branch wave, includes input, collimating lens, demultiplexing subassembly, first light beam convergence subassembly, a photoelectric detector receiving terminal, its characterized in that: the demultiplexing assembly includes a substrate; a plurality of wavelength division multiplexing membranes are respectively arranged on a first surface and a second surface which are opposite to each other on the substrate; a first light beam convergence assembly and a first photoelectric detector receiving end are sequentially arranged outside the first surface; and a second light beam convergence assembly and a second photoelectric detector receiving end are sequentially arranged outside the second surface.
Furthermore, the same number of wavelength division multiplexing diaphragms are arranged on the first surface and the second surface; the wavelength division multiplexing diaphragms include first to nth wavelength division multiplexing diaphragms.
Further, a reflecting mirror is arranged between the collimating lens and the demultiplexing component.
Furthermore, one side of the demultiplexing component is provided with a refraction prism.
Furthermore, a first reflection prism and a second reflection prism are respectively arranged outside the first surface and the second surface.
Further, the input end and the collimating lens are integrated into a whole.
Further, the N is one of 4, 6, 8, 10, 12 and 16.
The utility model has the advantages that:
the wavelength division demultiplexing component is used for folding the optical path, so that the advantages of smaller size, lower loss, smaller volume, higher integration level and the like can be realized.
Drawings
Fig. 1 shows a conventional multi-wavelength multiplexing optical module.
Fig. 2 shows another conventional multi-wavelength multiplexing optical module.
Fig. 3 is a receiving module according to a first embodiment of the present invention.
Fig. 4 is a second embodiment of the present invention, a multi-wavelength demultiplexing receiving module.
Fig. 5 is a third embodiment of the present invention, a multi-wavelength demultiplexing receiving module.
Fig. 6 shows a fourth embodiment of the present invention, which is a multi-wavelength demultiplexing receiving module.
Fig. 7 is a fifth embodiment of the present invention, a multi-wavelength demultiplexing receiving module.
Fig. 8 is a schematic view of the turning light path of the middle reflection prism of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 3, a first embodiment of the present invention provides a multi-wavelength demultiplexing receiving module, including: an input end 6, a collimating lens 5 and a reflector 4; a first wavelength division multiplexing membrane 31, a second wavelength division multiplexing membrane 32, a third wavelength division multiplexing membrane 33 and a fourth wavelength division multiplexing membrane 34 which are sequentially arranged on the first surface 301 of the demultiplexing component 3; a first converging lens 211, a second converging lens 212, a third converging lens 213 and a fourth converging lens 214 are arranged in the first light beam converging assembly 2 and respectively correspond to the first wavelength division multiplexing membrane 31 to the fourth wavelength division multiplexing membrane 34; the first photoelectric detector receiving end 1 comprises a first photoelectric detector 11, a second photoelectric detector 12, a third photoelectric detector 13 and a fourth photoelectric detector 14, and respectively receives light beams with different wavelengths respectively lambda 1, lambda 2, lambda 3 and lambda 4 after being converged by a first converging lens 211 to a fourth converging lens 214; a fifth wavelength division multiplexing membrane 35, a sixth wavelength division multiplexing membrane 36, a seventh wavelength division multiplexing membrane 37 and an eighth wavelength division multiplexing membrane 38, which are sequentially arranged on the second surface 302 of the demultiplexing component 3; a fifth focusing lens 215, a sixth focusing lens 216, a seventh focusing lens 217 and an eighth focusing lens 218 are arranged in the second light beam converging assembly 2', and respectively correspond to the fifth wavelength division multiplexing diaphragm 35 to the eighth wavelength division multiplexing diaphragm 38; the second photodetector receiving end 1' includes a fifth photodetector 15, a sixth photodetector 16, a seventh photodetector 17, and an eighth photodetector 18, and respectively receives light beams with different wavelengths λ 5, λ 6, λ 7, and λ 8, which are respectively converged by the fifth converging lens 215 to the eighth converging lens 218.
The specific implementation process is as follows:
referring to fig. 3, the optical signal input at the input end 6 includes eight optical signals of λ 1, λ 2, λ 3, λ 4, λ 5, λ 6, λ 7, and λ 8, which are collimated by the collimating lens 5, and then become parallel light, and then are reflected by the reflecting mirror 4, and enter the demultiplexing component 3.
Eight optical signals of λ 1, λ 2, λ 3, λ 4, λ 5, λ 6, λ 7, and λ 8 are incident on the first wavelength division multiplexing film 31 through the substrate 30, and the optical signal λ 1 is transmitted through the first wavelength division multiplexing film 31 and received by the first photodetector 11.
λ 4, λ 7, λ 8 are reflected by the third wavelength division multiplexing film 33, and then enter the seventh wavelength division multiplexing film 37 through the substrate 30, and the optical signal λ 7 is transmitted through the seventh wavelength division multiplexing film 37 and then received by the seventh photodetector 17.
λ 4, λ 8 are reflected by the seventh wavelength division multiplexing film 37, and then enter the fourth wavelength division multiplexing film 34 through the substrate 30, and the optical signal λ 4 is transmitted through the fourth wavelength division multiplexing film 34 and then received by the fourth photodetector 14.
Finally, the demultiplexing process is completed, and the multi-wavelength division receiving module is realized. Obviously, if the wavelength division multiplexing diaphragms are placed in different orders, the optical signals received by the corresponding photodetectors are different, and the receiving positions of the corresponding optical signals can be flexibly configured as required.
Referring to fig. 4, compared with the first embodiment, the second embodiment of the present invention is a multi-wavelength division receiving module, which has the same principle as the optical path, that is, a refractive prism 41 is added to make the second photodetector receiving end 1' obtain the orthogonal position layout with equal spacing.
Referring to fig. 5, compared with the first embodiment, the third embodiment of the present invention is a multi-wavelength demultiplexing receiving module, which adds a first reflection prism 43 and a second reflection prism 44 to make each demultiplexing-thickness optical signal reflect toward the lower side of the illustrated paper surface in the same principle as the optical path. The first converging lens assembly 2 and the first photodetector receiving end 1 are also in a position below the corresponding reflecting prisms, as shown in fig. 8. The second converging lens assembly 2 'behind the second reflecting prism 44 and the second photodetector receiving end 1' are the same.
Referring to fig. 6, the fourth embodiment of the present invention is a multi-wavelength demultiplexing receiving module, which is similar to the third embodiment in principle and optical path, and the mirror 4 is removed, and the optical signal inputted from the input terminal 6 is collimated into parallel light by the collimating lens 5, and then directly enters the demultiplexing component 3. The advantage of overall arrangement like this is, first photoelectric detector receiving terminal 1 is two rows of overall arrangements in front and back relative input 6, reduces the lateral distance of first photoelectric detector receiving terminal 1 and the overall arrangement of second photoelectric detector receiving terminal 1' both sides, and this overall arrangement structure is compacter.
Referring to fig. 7, a fifth embodiment of the present invention is a multi-wavelength demultiplexing receiving module, and the principle is substantially the same as that of the optical path compared with the fourth embodiment. As can be seen from the illustration, in fig. 6, the respective wavelength signals are transmission reflection demultiplexed at the junction surface of the wavelength division multiplexing film and the substrate 30; in fig. 7, transmission-reflection demultiplexing occurs on the side of the wavelength division multiplexing film that is relatively close to the receiving end of the photodetector for each wavelength signal. The difference is whether the wdm film face is near the substrate 30 (embodiments one, two, three, four) or near the photodetector receiver (embodiment five). The coating requirements of the corresponding wavelength division multiplexing membranes have slight difference. It is apparent from a comparison of fig. 6 and 7 that the size of the substrate 30 in fig. 7 is smaller than that in fig. 6. The advantages of this are: the first photoelectric detector receiving end 1 and the second photoelectric detector receiving end 1' are arranged in a front row and a rear row relative to the input end 6, so that the lateral distance of the arrangement on the two sides of the photoelectric detector receiving ends is reduced, the arrangement structure is more compact, and higher integration level is realized.
The above-mentioned preferred embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (7)
1. The utility model provides a receiving module of multi-wavelength branch wave, includes input (6), collimating lens (5), demultiplexing subassembly (3), first light beam assembles subassembly (2), first photoelectric detector receiving terminal (1), its characterized in that: the demultiplexing assembly (3) comprises a substrate (30); a plurality of wavelength division multiplexing diaphragms are respectively arranged on a first surface (301) and a second surface (302) which are opposite to each other on the substrate (30); a first light beam convergence assembly (2) and a first photoelectric detector receiving end (1) are sequentially arranged outside the first surface (301); and a second light beam converging assembly (2 ') and a second photoelectric detector receiving end (1') are sequentially arranged outside the second surface (302).
2. The multi-wavelength demultiplexing receiving module according to claim 1, wherein: the same number of wavelength division multiplexing diaphragms are arranged on the first surface (301) and the second surface (302); the wavelength division multiplexing membranes include a first wavelength division multiplexing membrane (31) through an Nth wavelength division multiplexing membrane.
3. The multi-wavelength demultiplexing receiving module according to claim 1, wherein: and a reflecting mirror (4) is arranged between the collimating lens (5) and the demultiplexing component (3).
4. The multi-wavelength demultiplexing receiving module according to claim 1, wherein: one side of the demultiplexing component (3) is provided with a refraction prism (41).
5. The multi-wavelength demultiplexing receiving module according to claim 1, wherein: and a first reflection prism (43) and a second reflection prism (44) are respectively arranged outside the first surface (301) and the second surface (302).
6. The multi-wavelength demultiplexing receiving module according to claim 1, wherein: the input end (6) and the collimating lens (5) are integrated into a whole.
7. The multi-wavelength demultiplexing receiving module according to claim 2, wherein: and N is one of 4, 6, 8, 10, 12 and 16.
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| CN201921576329.7U CN210666094U (en) | 2019-09-20 | 2019-09-20 | Multi-wavelength splitting receiving module |
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| CN201921576329.7U CN210666094U (en) | 2019-09-20 | 2019-09-20 | Multi-wavelength splitting receiving module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253391A (en) * | 2021-05-28 | 2021-08-13 | 闽都创新实验室 | 5G forward wavelength division multiplexing module based on optical fiber array and assembling method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253391A (en) * | 2021-05-28 | 2021-08-13 | 闽都创新实验室 | 5G forward wavelength division multiplexing module based on optical fiber array and assembling method thereof |
| CN113253391B (en) * | 2021-05-28 | 2022-07-08 | 闽都创新实验室 | 5G forward wavelength division multiplexing module based on optical fiber array and assembling method thereof |
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