CN113359252B - Multi-channel optical module with single fan-in fan-out based on MPO interface - Google Patents
Multi-channel optical module with single fan-in fan-out based on MPO interface Download PDFInfo
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- CN113359252B CN113359252B CN202110731592.4A CN202110731592A CN113359252B CN 113359252 B CN113359252 B CN 113359252B CN 202110731592 A CN202110731592 A CN 202110731592A CN 113359252 B CN113359252 B CN 113359252B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
Abstract
The invention discloses a single fan-in fan-out multi-channel optical module based on an MPO interface, which belongs to the technical field of optical modules and comprises an LD module with N channels, a multi-core optical fiber fan-in fan-out device with 2N input ports and 2N/M output ports, 2N/M multi-core optical fibers with M cores and a multi-core optical fiber MPO connector, wherein the multi-core optical fibers are sequentially arranged along the direction of an optical axis, the multi-core optical fiber fan-in fan-out device is coupled with the output end of the multi-core optical fiber fan-in fan-out device, and the multi-core optical fiber MPO connector is connected with the 2N/M multi-core optical fibers, wherein M represents the number of the cores of the used multi-core optical fibers. Compared with the conventional single-core parallel high-density transmission scheme, the invention does not need to use a high-cost high-density MPO connector. Compared with the wavelength division multiplexing transmission scheme, lasers with different wavelengths are not needed, and the cost and the insertion loss of the fan-in fan-out device adopted in the invention are lower than the cost of wavelength division multiplexing and de-multiplexing devices. The invention saves the wiring space and has better overall cost.
Description
Technical Field
The invention belongs to the technical field of optical modules, and particularly relates to a single fan-in fan-out multi-channel optical module based on an MPO interface.
Background
At present, the high-speed optical module mainly comprises SR4, PSM4, SR8 and SR16 which are transmitted in parallel, CWDM4, LR4, ER4, FR8, LR8, ER8 and the like which use a wavelength division multiplexing transmission scheme. The parallel transmission adopts a mode of parallel transmission of a plurality of optical fibers to realize high-speed transmission of a single module. For example, SR4 and PSM4 adopt 4 optical fibers for light collection, 4 optical fibers for light emission to realize 8-channel transceiving, SR8 needs to adopt 16 optical fibers for parallel transmission, which are 8-channel transceiving and 8-channel transceiving, and so on. The parallel scheme needs to use high-density MPO connectors to connect with the optical modules, the higher the number of channels is, the higher the required MPO connector density is, while the currently most commonly used 12-channel MPO interface can only meet the transceiving requirement of 8 channels, and with the increase of the module speed, the increase of the consumed optical fiber amount, the requirement on the interface density and the volume of the transmission optical cable of the parallel scheme become challenges.
In transmission scenarios larger than 500m, the amount of optical fiber is not suitable for long distance transmission, since parallel transmission consumes a multiple of the transmission distance. Therefore, the transmission is usually performed by using the wavelength division multiplexing method, and the wavelength division multiplexing method only needs to consume one receiving fiber and one transmitting fiber with two fibers no matter how many channels are, so that the total usage amount of the used fibers is less. However, the wavelength division multiplexing scheme needs to add a multiplexer, the cost of the existing multi-channel multiplexer is high, and a plurality of lasers with different wavelengths, such as LR8, need to be used, and 8 lasers with different wavelengths are needed to emit light. The maturity and the multiplexing degree of an industrial chain can be influenced to a certain extent, and the comprehensive cost of the wavelength division multiplexing scheme is higher.
With the development of communication technology, the number of optical module channels inevitably shows a trend of increasing. With parallel schemes, interface density can become a major bottleneck. However, with the wavelength division multiplexing scheme, the number of wavelengths of the laser needs to be increased, the wavelength interval needs to be reduced, and the problems of cost, crosstalk and the like also become the bottleneck of the high-channel-density optical module.
There is therefore a need for a more cost-effective high channel density optical module solution that saves optical fiber, routing space, and has ultra-high interface density, and is capable of using co-wavelength lasers.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a single fan-in fan-out multi-channel optical module based on an MPO interface, which is a high-channel-density optical module which can save optical fibers, save wiring space, has ultrahigh interface density and can use a same-wavelength laser with higher cost.
In order to achieve the above object, the present invention provides a single fan-in and fan-out multi-channel optical module based on an MPO interface, which includes an LD module having N channels, a multi-core fiber fan-out device having 2N input ports and 2N/M output ports, 2N/M multi-core fibers coupled to output ends of the multi-core fiber fan-in and fan-out device and having M cores, and a multi-core fiber MPO connector connected to the 2N/M multi-core fibers, where M represents the number of cores of the used multi-core fibers, which are sequentially arranged along an optical axis direction.
In some alternative embodiments, the multi-core fiber fan-in fan-out device is a 2N-channel M-core fiber fan-in fan-out device.
In some alternative embodiments, the 2N input ports of the multi-core fiber fan-in fan-out device are directly connected to conventional single-mode fibers, or receive laser emission directly through lens coupling, or are directly aligned with the detector array.
In some optional embodiments, the multicore fiber fan-in and fan-out device has 2N input ports and 2N/M output ports, the input ports are divided into two groups, a first group of the input ports has N input ports, the interval of the first group of the input ports is the same as the arrangement interval of the laser modules, a second group of the input ports has N input ports, and the interval of the second group of the input ports is the same as the arrangement interval of the detector modules.
In some optional embodiments, N first focusing lenses respectively corresponding to N channels of the LD module are disposed between the N-channel LD module and the input port of the multicore fiber fan-in fan-out device, and are configured to converge and couple N divergent light sources emitted by the LD module to N input ports of a first group of the multicore fiber fan-in fan-out device, and enter M parallel channels of N/M core fibers from N/M output ports of the multicore fiber fan-in fan-out device.
In some optional embodiments, after N channels formed by N/M additional multi-core fibers receive signals of other optical modules and pass through N/M additional output ports of the fan-out device, the signals directly enter the detector array through N input ports of the second group of the fan-in fan-out device, and the N-sending and N-receiving parallel optical modules are implemented.
In some alternative embodiments, each output port of the multi-core fiber fan-in fan-out device is connected to one M-core multi-core fiber, either directly or through an array of fibers.
In some alternative embodiments, each core of the M-core multi-core optical fiber is capable of signal transmission as a conventional single-core optical fiber.
In some alternative embodiments, the multi-core fiber MPO connector is a 2N/M-core fiber MPO connector.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the invention adopts a novel optical module structure, can easily realize an ultrahigh channel density optical module, and can realize 96-channel transmission by adopting 12-core 8-core optical fiber MPO, for example. Compared with the original single-core parallel scheme, the 96-core MPO connector with ultrahigh density is needed for realizing 96-core transmission, so that the preparation difficulty is greatly reduced, the quantity of external wiring optical fibers is saved, and the density of an external channel is greatly improved. The problem of wiring density in applications such as data centers is solved. Compared with a wavelength division multiplexing scheme, the invention can adopt a laser with a single wavelength, is more beneficial to the scale mass production of an industrial chain and the stock of manufacturers, and changes the original MUX and DEMUX devices into the existing single optical fiber fan-in and fan-out device which is provided with 2N input ports and 2N/M output ports, thereby having better cost. And the insertion loss of the fan-in fan-out device is less than that of the MUX and DEMUX devices, so that more allowance is reserved for the whole loss of the optical module.
Drawings
Fig. 1 is a schematic diagram of an optical module optical path structure based on an 8-core optical fiber 96-channel fan-in fan-out device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a 96-channel 8-core fiber fan-in fan-out device provided by an embodiment of the invention;
fig. 3 is a cross-sectional view of an eight-core optical fiber according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present examples, "first", "second", etc. are used for distinguishing different objects, and are not used for describing a specific order or sequence.
The invention provides a solution for an optical module of low-cost long-distance ultrahigh channel density parallel transmission, which improves the density by multiplying the number of channels, and each channel of the optical module can use a laser with the same wavelength. Only one 8-core fiber is needed to realize transmission of 8 channels, and only two 8-core fibers are needed to realize 16 channels. By analogy, the transmission of the 96-channel ultrahigh-density optical module can be easily realized by adopting a 12-core 8-core optical fiber MPO connector. Compared with the conventional single-core parallel high-density transmission scheme, the high-density MPO connector with high cost does not need to be used. Compared with the wavelength division multiplexing transmission scheme, lasers with different wavelengths are not needed, and the cost and the insertion loss of the fan-in fan-out device adopted in the invention are lower than the cost of wavelength division multiplexing and de-multiplexing devices. The invention saves the wiring space and has better overall cost.
Example 1:
as shown in fig. 1, 2, and 3, a novel multi-channel optical module includes 48-channel LD modules 1(11 to 148), 96-channel 8-core fiber fan-in and fan-out devices 3, an eight-core fiber array 4, 8-core fibers 5 (each core is numbered 51 to 58) coupled to an 8-core fiber fan-in and fan-out output end, and an 8-core fiber MPO connector 6 connected to 12 8-core fibers, which are sequentially arranged along an optical axis direction. 48 first focusing lenses 2 (numbered 21-248) corresponding to 48 channels of the LD module are arranged between the input ends of the 48-channel LD module 1 and the 96-channel 8-core optical fiber fan-in fan-out device 3, and are used for converging 48 paths of divergent light sources emitted by the laser module, coupling the converged light sources into 48 input ports 349-396 of the fan-in fan-out device, and entering 6 8-core optical fibers 397-408 from the output end of the fan-in fan-out device.
The 8-core fiber fan-in and fan-out device has 96 input ports and 12 output ports, the input ports are divided into two groups, the first group is numbered 349, 350, 351 … 396, and the second group is numbered 31, 32, 33 … 348. The interval of the first group of input ports is the same as the arrangement interval of the laser module 1, and the interval of the second group of input ports is the same as the arrangement interval of the detector module 7. The output ports 397-408 of the 8-core optical fiber fan-in fan-out device are connected with 8-core optical fibers 5 through the 8-core optical fiber array 4. The insertion loss of the fan-in fan-out device 3 is 2dB, preferably 1.5 dB.
The other 48 input ports 31, 32 and 33 … 348 at the input end of the 8-core optical fiber fan-in fan-out device 3 are directly aligned with the detector array 7 with the serial numbers 71, 72 and 73 … 748, and the other 6 signals of the 8-core optical fibers received by other optical modules enter the detector arrays 71, 72 and 73 … 748 through the fan-in fan-out devices 31-348, so that a 48-transmission 48-reception parallel optical module scheme is realized.
Example 2:
the number of lasers in the laser array, the number of detectors in the detector array, the number of cores of the multi-core fiber, and the number of channels fanned into the fan-out device in example 2 are all the same as those in example 1, and the arrangement of the lasers and detectors is a 3 x 16 rectangular arrangement.
Example 3:
the number of lasers in the laser array, the number of detectors in the detector array, the number of cores of the multi-core fiber, and the number of channels fanned into the fanout device in example 3 are all 2 times the number of related in example 1.
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The multi-channel optical module is characterized by comprising an LD module with 48 channels, an 8-core optical fiber fan-in fan-out device with 96 input ports and 12 output ports, 12 multi-core optical fibers with 8 cores and 12-core 8-core optical fiber MPO connectors, wherein the LD module, the 8-core optical fiber fan-in fan-out device, the 12 multi-core optical fibers and the 12-core 8-core optical fiber MPO connectors are sequentially arranged along the optical axis direction, and the 8 multi-core optical fibers are coupled with the output ends of the 8-core optical fiber fan-in fan-out device.
2. The multi-channel optical module of claim 1, wherein 96 input ports of the 8-core fiber fan-in fan-out device are directly connected to conventional single-mode fibers, or directly receive laser emission through lens coupling, or directly aligned with a detector array.
3. The multi-channel optical module of claim 2, wherein the input ports of the 8-core optical fiber fan-in fan-out device are divided into two groups, the first group of input ports has 48 input ports, the interval of the first group of input ports is the same as the arrangement interval of the laser modules, the second group of input ports has 48 input ports, and the interval of the second group of input ports is the same as the arrangement interval of the detector modules.
4. The multi-channel optical module of claim 3, wherein 48 first focusing lenses corresponding to 48 channels of the LD module are disposed between the 48-channel LD module and the input port of the 8-core fiber fan-in fan-out device, and are used for converging and coupling 48 divergent light sources emitted from the LD module into the 48 input ports of the first group of the 8-core fiber fan-in fan-out device, and entering 8 parallel channels of 6 8-core fibers from 6 output ports of the 8-core fiber fan-in fan-out device.
5. The multi-channel optical module of claim 4, wherein 48 channels formed by another 6 8-core optical fibers receive signals of other optical modules, and after the signals pass through another 6 output ports of the 8-core optical fiber fan-in fan-out device, the signals directly enter the detector array through 48 input ports of the second group of the 8-core optical fiber fan-in fan-out device, so that 48-wavelength parallel optical modules are realized.
6. The multi-channel optical module of claim 1, wherein each output port of the 8-core fiber fan-in fanout device is connected to one 8-core fiber either directly or through an array of fibers.
7. The multi-channel optical module of claim 6, wherein each core of the 8-core optical fiber is capable of signal transmission as a conventional single-core optical fiber.
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| CN115728866B (en) * | 2022-11-09 | 2023-07-18 | 之江实验室 | Multilayer optical rewiring structure of silicon photonic chip and preparation method thereof |
| CN116540361B (en) * | 2023-07-05 | 2023-09-12 | 中国电信股份有限公司 | Multi-core transmission system and multi-core transmission method |
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