CN109557618B - Wavelength division multiplexing device - Google Patents
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- CN109557618B CN109557618B CN201910077959.8A CN201910077959A CN109557618B CN 109557618 B CN109557618 B CN 109557618B CN 201910077959 A CN201910077959 A CN 201910077959A CN 109557618 B CN109557618 B CN 109557618B
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- 239000004065 semiconductor Substances 0.000 claims abstract description 47
- 238000006243 chemical reaction Methods 0.000 claims abstract description 43
- 239000013307 optical fiber Substances 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 16
- 238000010168 coupling process Methods 0.000 claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000002310 reflectometry Methods 0.000 claims description 6
- 238000003491 array Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 42
- 238000005516 engineering process Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 1
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- 230000003252 repetitive effect Effects 0.000 description 1
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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
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
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Abstract
The invention provides a wavelength division multiplexing device, which comprises a semiconductor laser output module, a modulator, a transmitting end conversion lens, a diffraction grating, a reflecting mirror, an output coupling mirror, a receiving end conversion lens and a photoelectric detector, wherein the diffraction grating is arranged on the back focal plane of the transmitting end conversion lens and is used as a wavelength division multiplexer and a demultiplexer; when the diffraction grating is used as a wavelength division multiplexer, the diffraction grating is coupled with each path of light beam; when the diffraction grating is used as a demultiplexer, the diffraction grating splits a light beam carrying a modulated signal, which is transmitted through an optical fiber. The wavelength division multiplexing device locks densely arranged multipath wavelengths through the feedback of the external cavity, adopts a high-power semiconductor laser, does not need an optical amplifier, and has the working wavelength not limited by the optical amplifier; the wavelength division multiplexer and the demultiplexer for receiving signals, which use one diffraction grating as signal output, have the advantages of simple structure, small loss, higher efficiency and the like.
Description
Technical Field
The invention relates to the technical field of laser communication, in particular to a device for realizing dense wavelength division multiplexing by utilizing spectrum beam combination.
Background
With the development of multimedia communication and the wide application of computer technology in recent years, the field scope of information communication is expanding, and the capacity of network communication is increasing dramatically, so that it is becoming more and more important to increase the capacity of telecommunication network. Wavelength division multiplexing is an important means for solving the problem, and is widely applied to modern optical fiber communication.
The wavelength division multiplexing technology is a technology of combining multiple light beams carrying modulated signals with different wavelengths through a wavelength division multiplexer, coupling the light beams to the same optical fiber for transmission, and separating the multiple light beams through a demultiplexer to perform information transmission. The wavelength division multiplexing technology has the greatest advantage that more transmission channels can be provided on the original single-mode fiber, and the bandwidth resources of the optical fiber are fully utilized. And has the advantages of transparent signal transmission, simple upgrading, low cost and the like.
Wavelength division multiplexing can be classified into coarse wavelength division multiplexing and dense wavelength division multiplexing according to wavelength intervals. The wavelength interval in coarse wavelength division multiplexing is generally larger than 20nm, and the communication channels are fewer, so that the method is a low-cost solution. The wavelength interval of dense wavelength division multiplexing is generally less than 1.6nm, and the method is an important technology for realizing high-speed, large-capacity, long-distance and high-performance communication transmission.
The spectrum beam combining technology is one kind of beam combining technology to lock multiple semiconductor beams in different wavelengths via the feedback action of the outer cavity and to combine the multiple semiconductor beams into one beam via the diffraction action of the grating. The spectral combining technique can form densely arranged multiple wavelengths and is coupled into an optical fiber, and has unique advantages as a light source in the wavelength division multiplexing technique.
The wavelength division multiplexer and the demultiplexer are key components of the wavelength division multiplexing technology, and the function of the wavelength division multiplexer is to combine signals with different wavelengths together and output the signals through one optical fiber; on the contrary, the function of the demultiplexer is to decompose the multi-wavelength signal sent by the same transmission fiber into individual wavelengths and output them separately. In principle, the two devices are reciprocal, i.e. the demultiplexer is simply the output and input of the wavelength division multiplexer are used in reverse. The common wavelength division multiplexer and demultiplexer include a grating type wavelength division multiplexer, a dielectric film type multiplexer, an array waveguide multiplexer and the like.
A complete wdm system should include both directional transmissions, i.e. both output and reception of signals. As shown in fig. 1, when the first optical signal terminal 100 transmits an optical signal to the second optical signal terminal 100', the multiple first optical transmitters 101 send signals, and the signals are combined by the first wavelength division multiplexer 102 and coupled to the first optical fiber 103 for transmission, and the signals are amplified by the first optical amplifier 104 during transmission, and then the multiple optical signals are separated by the second demultiplexer 105', and the multiple second receivers 106' respectively receive the corresponding optical signals. Conversely, when the first optical signal end receives the optical signals transmitted by the second optical signal end, the signals are sent out from the multipath second optical transmitters 101', combined by the second wavelength division multiplexer 102', coupled to the second optical fiber 103 'for transmission, amplified by the second optical amplifier 104' during transmission, and then separated by the first demultiplexer 105, and the multipath first receivers 106 respectively receive the corresponding optical signals. In this process, two optical amplifiers are required between the first optical signal terminal 100 and the second optical signal terminal 100', and one wavelength division multiplexer and one demultiplexer are required for each optical signal terminal.
The current wavelength division multiplexing technology has the following problems: the loss is large in the optical fiber transmission process, and an optical amplifier is needed; multiple wavelength division multiplexers and demultiplexers need to be used; the loss in the wavelength division multiplexing and demultiplexing process is large.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the invention and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a wavelength division multiplexing device which uses one diffraction grating as a wavelength division multiplexer for signal output and a demultiplexer for signal reception, and has the advantages of simple structure, small loss, higher efficiency and the like.
An embodiment of the present invention provides a wavelength division multiplexing device, including:
a semiconductor laser output module including a plurality of light emitting units;
The modulator is arranged on the light emitting side of the semiconductor laser output module and comprises a plurality of modulating units for modulating light beams emitted by each path of light emitting units respectively;
The semiconductor laser output module is arranged at the front focal plane of the transmitting end conversion lens, and the transmitting end conversion lens focuses each path of light beams carrying the modulation signals;
The diffraction grating is arranged on the back focal plane of the transmitting end conversion lens and is used as a wavelength division multiplexer and a demultiplexer;
When the diffraction grating is used as a wavelength division multiplexer, the diffraction grating is coupled with each path of light beam;
when the diffraction grating is used as a demultiplexer, the diffraction grating splits a light beam carrying a modulation signal and transmitted by an optical fiber;
the reflecting mirror is arranged on the light emitting side of the diffraction grating and used for changing the direction of the light beam after the beam combination of the diffraction grating;
The output coupling mirror is arranged on the light emergent side of the reflecting mirror and is perpendicular to the direction of the light beam with the changed direction through the reflecting mirror;
the receiving end conversion lens is arranged on the light emitting side of the diffraction grating, the distance between the receiving end conversion lens and the diffraction grating is 1 time of focal length, and the receiving end conversion lens collimates and splits each path of light beams carrying modulation signals;
The photoelectric detector array is arranged at the back focal plane of the receiving end lens and comprises a plurality of photoelectric detector units, wherein the number of the photoelectric detector units is the same as that of the light emitting units of the semiconductor laser output module, and the photoelectric detector array is used for receiving each path of light beams carrying the modulated signals.
Preferably, the wavelength division multiplexing device further includes a transmitting end beam collimation component, disposed on an outgoing side of the semiconductor laser output module, for collimating the light beams emitted by the light emitting units.
Preferably, the transmitting end beam collimation component is any one of a single fast axis collimation lens, a combination of the fast axis collimation lens and the slow axis collimation lens or a combination of the fast axis collimation lens and the 45-degree inclined cylindrical lens array.
Preferably, the wavelength division multiplexing device further includes a receiving end beam collimation component, which is disposed on the light emitting side of the receiving end conversion lens, and the receiving end beam collimation component focuses each path of light beam carrying the modulation signal.
Preferably, the receiving end beam collimation component is any one of a single fast axis collimation lens, a combination of the fast axis collimation lens and the slow axis collimation lens or a combination of the fast axis collimation lens and the 45-degree inclined cylindrical lens array.
Preferably, the diffraction grating has a diffraction efficiency of greater than 90% in the 1 st or-1 st order.
Preferably, the diffraction grating is a transmissive grating.
Preferably, the semiconductor laser output module is any one of a plurality of semiconductor laser single tubes arranged along a horizontal direction, a plurality of semiconductor laser arrays arranged along the horizontal direction, a plurality of semiconductor laser arrays arranged along a vertical direction or a semiconductor laser single tube two-dimensional array
Preferably, the fast axis and slow axis directions of the light beam of each of the light emitting units in the semiconductor laser output module are both single-mode outputs.
Preferably, the front end face of each of the light emitting units is coated with an antireflection film.
Preferably, the reflectance of the antireflection film is less than 1%.
Preferably, the rear end face of each of the light emitting units is plated with a high-reflection film.
Preferably, the high reflectance film has a reflectance of greater than 95%.
Preferably, the transmitting-end conversion lens is a cylindrical positive lens with an action direction of a slow axis.
Preferably, the cylindrical positive lens is any one of a single spherical cylindrical lens, a lens group composed of a plurality of spherical cylindrical lenses, a single aspherical cylindrical lens, or a lens group composed of a plurality of aspherical cylindrical lenses.
Preferably, the output coupling mirror is a partially reflecting mirror.
Preferably, the reflectivity of the partial mirror is between 5% and 30%.
Preferably, the receiving-end conversion lens is a cylindrical positive lens with a slow axis acting direction.
Preferably, the cylindrical positive lens is any one of a single spherical cylindrical lens, a lens group composed of a plurality of spherical cylindrical lenses, a single aspherical cylindrical lens, or a lens group composed of a plurality of aspherical cylindrical lenses.
Compared with the prior art, the wavelength division multiplexing device provided by the invention locks the densely arranged multipath wavelengths through the external cavity feedback, and has the following advantages:
1. the high-power semiconductor laser is adopted, an optical amplifier is not needed, and the working wavelength is not limited by the optical amplifier;
2. The wavelength division multiplexer and the demultiplexer for receiving signals, which use one diffraction grating as signal output, have simpler structure.
3. The spectrum combination is used as a method for wavelength division multiplexing and demultiplexing, so that the loss is small and the efficiency is higher.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application and, together with the description, further features, objects and advantages of the application, will become apparent from a reading of the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a conventional WDM system for signal transmission and reception;
Fig. 2 is a schematic diagram of a wavelength division multiplexing device according to an embodiment of the invention.
Reference numerals of the prior art
100. First optical signal terminal
101. First optical transmitter
102. First wavelength division multiplexer
103. First optical fiber
104. First optical amplifier
105. First demultiplexer
106. First receiver
100' Second optical signal end
101' Second optical transmitter
102' Second wavelength division multiplexer
103' Second optical fiber
104' Second optical amplifier
105' Second demultiplexer
106' Second receiver
Reference numerals of the invention
1. 1' Semiconductor laser array
1A, 1b, 1c light emitting unit
2. 2' Modulator
3. 3' Transmitting end conversion lens
4. 4' Diffraction grating
5. 5' Mirror
6. 6' Output coupling mirror
7. 7' Optical fiber
8. 8' Receiving end conversion lens
8A, 8b, 8c photodetector arrays
9. 9' Photodetector
10. Transmitting end beam collimation assembly
10A transmitting end fast axis collimating mirror
10B transmitting end slow axis collimating lens
11. Receiving end beam collimation assembly
11A receiving end fast axis collimating lens
11B receiving end slow axis collimating lens
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software or in one or more hardware modules or integrated circuits or in different networks and/or processor devices and/or microcontroller devices.
For convenience of description, two optical signal terminals (a third optical signal terminal 300 and a fourth optical signal terminal 300 ') are used as a system, which is shown by dashed lines 300 and dashed line boxes 300' in fig. 2, and a wavelength division multiplexing device is arranged in each dashed line box. Taking 300 dashed boxes as an example, the device specifically includes a semiconductor laser output module 1, a modulator 2, a transmitting-end conversion lens 3, a diffraction grating 4, a reflecting mirror 5, an output coupling mirror 6, a receiving-end conversion lens 8, and a photodetector 9.
A semiconductor laser output module 1 including a plurality of light emitting units 1a, 1b, and 1c; the number of light emitting units is not limited to the number in the embodiment. In practice, the semiconductor laser output module may be a plurality of semiconductor laser single tubes arranged in the horizontal direction, a plurality of semiconductor laser arrays arranged in the vertical direction, or a semiconductor laser single tube two-dimensional array. The invention does not need to actively control the wavelength of the semiconductor laser, so that the semiconductor laser with high power can be selected, certain power can be still reserved even if the semiconductor laser has loss in the optical fiber transmission process, an optical amplifier does not need to be added into a system, and the working wave band is not limited by the optical amplifier.
The fast axis and slow axis directions of the light beam of each light emitting unit in the semiconductor laser output module 1 are both single-mode outputs.
In an embodiment, the front end face of each light emitting unit is coated with an antireflection film, or/and the rear end face is coated with a high-reflection film. Preferably, the reflectance of the antireflection film is less than 1%, and the reflectance of the high reflection film is more than 95%.
The modulator 2 is disposed on the light emitting side of the semiconductor laser output module 1, and includes a plurality of modulating units for modulating the light beams emitted from each light emitting unit, respectively, even if each light beam carries a modulating signal.
A transmitting-side conversion lens 3, wherein when the transmitting-side conversion lens 3 is arranged, the front focal plane of the transmitting-side conversion lens is positioned on the semiconductor laser output module 1, and the transmitting-side conversion lens 3 focuses each path of light beam carrying a modulation signal; the transmitting end conversion lens can be a cylindrical positive lens with a slow axis acting direction, and the cylindrical positive lens can be a single spherical cylindrical lens, a lens group formed by a plurality of spherical cylindrical lenses, a single aspheric cylindrical lens or a lens group formed by a plurality of aspheric cylindrical lenses.
The diffraction grating 4 is arranged on the back focal plane of the transmitting end conversion lens 3, each path of light beam passing through the transmitting end conversion lens is focused on the diffraction grating 4, and the diffraction grating 4 is used as a wavelength division multiplexer and a demultiplexer;
when the diffraction grating 4 is used as a wavelength division multiplexer, the diffraction grating 4 is coupled with each path of light beam;
a reflecting mirror 5 provided on the light-emitting side of the diffraction grating 4, for changing the direction of the light beam after the beam combination by the diffraction grating 4;
and an output coupling mirror 6 disposed at the light emitting side of the reflecting mirror, wherein the output coupling mirror is perpendicular to the direction of the light beam having changed direction via the reflecting mirror 5, and the light beam emitted from the output coupling mirror 6 is transmitted to the fourth optical signal terminal 300' via the optical fiber 7. In an embodiment, the partial mirror is used as the output coupling mirror 6, and the reflectivity of the partial mirror may be between 5% and 30%.
The above-described semiconductor laser output module 1, overmodulator 2, transmitting-side conversion lens 3, diffraction grating 4, reflecting mirror 5, and output coupling mirror 6 can be regarded as the transmitting side of the third optical signal side 300.
In order to make the light beam emitted from the semiconductor laser output module 1 enter the modulator 2 in a coupling manner with maximum efficiency, the wavelength division multiplexing device according to an embodiment of the present invention further includes a transmitting end light beam collimation component 10 disposed on the light emitting side of the semiconductor laser output module 1, and collimates the light beam emitted from each light emitting unit. The transmitting end beam collimation assembly may be a combination of a single fast axis collimator lens, a fast axis collimator lens and a 45 ° tilted cylinder lens array, or a combination of a fast axis collimator lens 10a and a slow axis collimator lens 10b in the embodiment of fig. 2.
The receiving end of the third optical signal end 300 is configured to receive the light beam transmitted from the transmitting end of the fourth optical signal end 300', that is, from the semiconductor laser output module 1', through the modulator 2', the transmitting end conversion lens 3', the diffraction grating 4', the reflecting mirror 5', the output coupling mirror 6', and the optical fiber 7' in order.
The receiving end of the third optical signal end 300 includes:
A diffraction grating 4, which serves as a demultiplexer at this time, for splitting the light beam carrying the modulated signal transmitted through the optical fiber;
the receiving-end conversion lens 8 is arranged on the light-emitting side of the diffraction grating 4, the distance between the receiving-end conversion lens 8 and the diffraction grating 4 is 1 time of focal length, and each path of light beam carrying the modulation signal after collimation and beam splitting of the receiving-end conversion lens 8. Likewise, the receiving-end conversion lens 8 may be a cylindrical positive lens whose acting direction is a slow axis, and the cylindrical positive lens may be any one of a single spherical cylindrical lens, a lens group composed of a plurality of spherical cylindrical lenses, a single aspherical cylindrical lens, or a lens group composed of a plurality of aspherical cylindrical lenses.
The photoelectric detector array 9 is arranged at the back focal plane of the receiving end lens 8 and comprises a plurality of photoelectric detector units 8a, 8b and 8c, and the number of the photoelectric detector units 9 is the same as that of the light emitting units of the semiconductor laser output module and is used for receiving light beams carrying modulation signals in each path.
The receiving end of the wavelength division multiplexing device according to an embodiment of the present invention may further include a receiving end beam collimation assembly 11 disposed on the light emitting side of the receiving end conversion lens, where the receiving end beam collimation assembly focuses each path of light beam carrying the modulated signal. The receiving-end beam collimating assembly 11 may be any one of a single fast axis collimator lens, a combination of a fast axis collimator lens 11a and a slow axis collimator lens 11b, or a combination of a fast axis collimator lens and a 45 ° oblique cylinder lens array.
Similarly, the receiving end of the fourth optical signal end 300' includes a receiving end conversion lens 8' and a photodetector array 9' for receiving the light beam transmitted from the transmitting end of the third optical signal end 300, which is not described herein.
In the present invention, the diffraction grating 4 is both a wavelength division multiplexer and a demultiplexer. In one embodiment, the diffraction efficiency of the diffraction grating 4 at 1 st or-1 st order is greater than 90%. Preferably, the diffraction grating 4 is a transmissive grating. When the diffraction grating is used as a multiplexer or a demultiplexer, the diffraction efficiency of the grating, namely the multiplexing efficiency of the wavelength division multiplexer and the demultiplexing efficiency of the demultiplexer, can reach 95%. In conventional wdm technology, the insertion loss of the wdm and the demux is typically greater than 50%. The invention uses the diffraction grating as the wavelength division multiplexer and the demultiplexer, not only simplifies the structure in the prior art, but also greatly improves the efficiency of the wavelength division multiplexing and the demultiplexing.
In summary, the present invention provides a wavelength division multiplexing device, which includes a semiconductor laser output module, a modulator, a transmitting end conversion lens, a diffraction grating, a reflector, an output coupling mirror, a receiving end conversion lens and a photodetector, wherein the diffraction grating is disposed on a back focal plane of the transmitting end conversion lens, and the diffraction grating is used as a wavelength division multiplexer and a demultiplexer; when the diffraction grating is used as a wavelength division multiplexer, the diffraction grating is coupled with each path of light beam; when the diffraction grating is used as a demultiplexer, the diffraction grating splits a light beam carrying a modulated signal, which is transmitted through an optical fiber. Compared with the prior art, the wavelength division multiplexing device provided by the invention locks the densely arranged multipath wavelengths through the external cavity feedback, and has the following advantages:
1. the high-power semiconductor laser is adopted, an optical amplifier is not needed, and the working wavelength is not limited by the optical amplifier;
2. The wavelength division multiplexer and the demultiplexer for receiving signals, which use one diffraction grating as signal output, have simpler structure.
3. The spectrum combination is used as a method for wavelength division multiplexing and demultiplexing, so that the loss is small and the efficiency is higher.
The foregoing is a further detailed description of the application in connection with the preferred embodiments, and it is not intended that the application be limited to the specific embodiments described. It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units or means recited in the apparatus claims can also be implemented by means of one unit or means in software or hardware. The terms first, second, third, fourth and the like are used to denote names, and not to denote any particular order.
Claims (15)
1. A wavelength division multiplexing device, comprising:
a semiconductor laser output module including a plurality of light emitting units; the rear end face of each light-emitting unit is plated with a high-reflection film; the reflectivity of the high-reflectivity film is more than 95%;
The modulator is arranged on the light emitting side of the semiconductor laser output module and comprises a plurality of modulating units for modulating light beams emitted by each path of light emitting units respectively;
The semiconductor laser output module is arranged at the front focal plane of the transmitting end conversion lens, and the transmitting end conversion lens focuses each path of light beams carrying the modulation signals;
The diffraction grating is arranged on the back focal plane of the transmitting end conversion lens and is used as a wavelength division multiplexer and a demultiplexer;
When the diffraction grating is used as a wavelength division multiplexer, the diffraction grating is coupled with each path of light beam;
when the diffraction grating is used as a demultiplexer, the diffraction grating splits a light beam carrying a modulation signal and transmitted by an optical fiber;
the reflecting mirror is arranged on the light emitting side of the diffraction grating and used for changing the direction of the light beam after the beam combination of the diffraction grating;
the output coupling mirror is arranged on the light emergent side of the reflecting mirror and is perpendicular to the direction of the light beam with the changed direction through the reflecting mirror; the output coupling mirror is a partial reflecting mirror; the reflectivity of the partial reflector is between 5% and 30%;
the receiving end conversion lens is arranged on the light emitting side of the diffraction grating, the distance between the receiving end conversion lens and the diffraction grating is 1 time of focal length, and the receiving end conversion lens collimates and splits each path of light beams carrying modulation signals;
The photoelectric detector array is arranged at the back focal plane of the receiving end lens and comprises a plurality of photoelectric detector units, wherein the number of the photoelectric detector units is the same as that of the light emitting units of the semiconductor laser output module, and the photoelectric detector array is used for receiving each path of light beams carrying the modulated signals.
2. The wavelength division multiplexing device of claim 1, wherein: the light beam collimation device comprises a semiconductor laser output module, a light emitting unit, a transmitting end light beam collimation assembly and a light beam collimation assembly, wherein the transmitting end light beam collimation assembly is arranged on the light emitting side of the semiconductor laser output module and is used for collimating light beams emitted by the light emitting units.
3. The wavelength division multiplexing device of claim 2, wherein: the transmitting end beam collimation component is any one of a single fast axis collimation lens, a combination of the fast axis collimation lens and a slow axis collimation lens or a combination of the fast axis collimation lens and a 45-degree oblique cylinder lens array.
4. The wavelength division multiplexing device of claim 1, wherein: the receiving end light beam collimation assembly is arranged on the light emitting side of the receiving end conversion lens, and the receiving end light beam collimation assembly focuses all paths of light beams carrying modulation signals.
5. The wavelength division multiplexing device as described in claim 4, wherein: the receiving end beam collimation component is any one of a single fast axis collimation lens, a combination of the fast axis collimation lens and a slow axis collimation lens or a combination of the fast axis collimation lens and a 45-degree oblique cylinder lens array.
6. The wavelength division multiplexing device of claim 1, wherein: the diffraction efficiency of the diffraction grating is greater than 90% in the 1 st order or the-1 st order.
7. The wavelength division multiplexing device of claim 1, wherein: the diffraction grating is a transmission grating.
8. The wavelength division multiplexing device of claim 1, wherein:
The semiconductor laser output module is any one of a plurality of semiconductor laser single tubes arranged along the horizontal direction, a plurality of semiconductor laser arrays arranged along the vertical direction or a semiconductor laser single tube two-dimensional array.
9. The wavelength division multiplexing device of claim 1, wherein: the fast axis and the slow axis directions of the light beam of each light emitting unit in the semiconductor laser output module are single-mode output.
10. The wavelength division multiplexing device of claim 1, wherein:
the front end face of each light-emitting unit is plated with an antireflection film.
11. The wavelength division multiplexing device of claim 10, wherein: the reflectivity of the antireflection film is less than 1%.
12. The wavelength division multiplexing device of claim 1, wherein: the transmitting end conversion lens is a cylindrical positive lens with a slow axis acting direction.
13. The wavelength division multiplexing device of claim 12, wherein: the cylindrical positive lens is any one of a single spherical cylindrical lens, a lens group formed by a plurality of spherical cylindrical lenses, a single aspherical cylindrical lens or a lens group formed by a plurality of aspherical cylindrical lenses.
14. The wavelength division multiplexing device of claim 1, wherein: the receiving end conversion lens is a cylindrical positive lens with a slow axis acting direction.
15. The wavelength division multiplexing device of claim 14, wherein: the cylindrical positive lens is any one of a single spherical cylindrical lens, a lens group formed by a plurality of spherical cylindrical lenses, a single aspherical cylindrical lens or a lens group formed by a plurality of aspherical cylindrical lenses.
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| WO2021055498A1 (en) * | 2019-09-16 | 2021-03-25 | Lasermotive, Inc. | Optical power for electronic switches |
| CN110912610A (en) * | 2019-10-29 | 2020-03-24 | 中航海信光电技术有限公司 | Wavelength division multiplexing receiving and transmitting integrated optical module, system and implementation method |
| CN112332924A (en) * | 2020-10-10 | 2021-02-05 | 武汉阿帕科技有限公司 | High-voltage tower communication device and method |
| CN115933211A (en) * | 2022-12-23 | 2023-04-07 | 核工业理化工程研究院 | Wave separator for coaxial multicolor laser beam with extremely small wavelength difference |
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| CN105319649A (en) * | 2015-10-23 | 2016-02-10 | 武汉电信器件有限公司 | Wavelength division multiplexing/de-multiplexing optical transceiving assembly based on diffraction grating |
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| CN105319649A (en) * | 2015-10-23 | 2016-02-10 | 武汉电信器件有限公司 | Wavelength division multiplexing/de-multiplexing optical transceiving assembly based on diffraction grating |
| CN106532435A (en) * | 2017-01-05 | 2017-03-22 | 苏州长光华芯光电技术有限公司 | Semiconductor laser array beam combining device |
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