CN112578503A - System for multi-wavelength signal common-fiber simultaneous transmission - Google Patents
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- CN112578503A CN112578503A CN202011644640.8A CN202011644640A CN112578503A CN 112578503 A CN112578503 A CN 112578503A CN 202011644640 A CN202011644640 A CN 202011644640A CN 112578503 A CN112578503 A CN 112578503A
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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
- G02B6/29379—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 characterised by the function or use of the complete device
- G02B6/2938—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 characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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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
- G02B6/29346—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 wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
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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
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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Abstract
The invention provides a system for multi-wavelength signal common-fiber simultaneous transmission, and relates to the field of optical fiber communication and quantum secret communication. The optical fiber wavelength division multiplexing module comprises a concave reflector, a triangular reflector, a public filter plate, a first filter plate, a second filter plate, a third filter plate and a fourth filter plate. The invention reduces the divergence angle of the light beam and reduces the signal loss by adjusting the distance between the optical fiber tail fiber and the lens in the optical fiber collimator. The invention can save cost, avoid using more filter plates and reduce the volume and complexity of the wavelength division multiplexer under the conditions of improving isolation and reducing loss.
Description
Technical Field
The invention relates to the technical field of optical fiber communication and the field of quantum secret communication, in particular to a system for multi-wavelength signal common-fiber simultaneous transmission.
Background
Wavelength Division Multiplexing (WDM) refers to a communication technology in which signals of two or more different wavelengths are coupled to the same optical fiber at a transmitting end by a Wavelength Division multiplexer for transmission, and optical signals of different wavelengths are separated at a receiving end by a Wavelength Division demultiplexer. Wavelength division multiplexing is one of the most effective methods for improving optical fiber communication at present, and therefore, the development of the wavelength division multiplexer is particularly important.
The isolation is a parameter specifically describing the wavelength-splitting unit, and is defined as the ratio of the output optical power of a certain wavelength to the optical power of another wavelength which is crosstalk to the channel, i.e., the isolation (dB) of the first wave to the second wave is P1(dBm) -P2 (dBm). However, the reflection isolation of the current thin film filter is generally not more than 25dB, and with the development of the optical fiber communication technology, the requirement of the user on the wavelength isolation of the wavelength division multiplexer is higher and higher, and the isolation of 25dB is far from meeting the requirement of the user.
With the rapid development of optical fiber communication, in the working process of optical passive devices such as an optical isolator, an optical circulator and an optical wavelength division multiplexer, the overlarge divergence angle of the gaussian beam causes great loss to signals, so that the requirement on the collimation of the gaussian beam is very high, and the optical fiber collimator is required to be used for collimation. In the optical wavelength division multiplexer, how to reasonably reduce the divergence angle of the gaussian beam and simultaneously increase the working distance of the optical fiber collimator becomes an important problem.
Quantum cryptography guarantees the security of information transfer by using the basic principle of quantum physics, and theoretically has unconditional security. In order to save the cost of laying the QKD network, the QKD network can be combined with an existing classical communication network, so that the quantum signal and the classical signal are transmitted in a common fiber, and a common technology is a wavelength division multiplexing technology. However, in the process of transmitting the quantum signal and the classical signal in the same optical fiber, the classical signal light has a very large intensity relative to the quantum signal light, which causes a great interference to the transmission of the quantum signal. Therefore, how to increase the isolation of the quantum signal from the classical signal is a problem to be solved urgently at present.
"prior art patent: (CN211348713U) discloses a high-isolation low-loss wavelength division multiplexer which improves isolation by doping an incident optical fiber, a reflection optical fiber and a transmission optical fiber with a material forming a low-loss optical waveguide, and fixing a high-transmission isolation film on a side surface of a wavelength division multiplexing film. However, when multiplexing multi-wavelength signals, it is necessary to fix a high-transmittance isolation film on the side of the multiple wavelength division multiplexing films, which greatly increases the cost of the device. "
"prior art patent: (CN211348715U) discloses a wavelength division multiplexing device, which integrates the original 21 × 2 device structures together, so as to reduce the volume, and since the device cost is mainly on the filter, the 2 × 4 device structure shares one filter, so the cost is greatly reduced. However, the four-wavelength signal has two common terminals, and the four-wavelength signal needs to enter from two common terminals respectively, so that the complexity and the cost of the device are increased. "
Therefore, there is a need for further improvement of the prior art, which can reduce the loss of the optical signal propagation process and increase the isolation of the quantum signal from the classical signal on the basis of reducing the device cost.
Disclosure of Invention
In order to solve the technical problem, a system for multi-wavelength signal common-fiber common transmission is provided, which reduces the loss in the optical signal propagation process and increases the isolation of quantum signals to classical signals.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a system that multi-wavelength signal shared fibre passes, includes incident fiber collimator, wavelength division multiplexing module and emergent fiber collimator group, wherein:
the incident optical fiber collimator is used for inputting signal light, the emergent optical fiber collimator group is used for outputting signal light, and the incident optical fiber collimator and the emergent optical fiber collimator group are arranged on the same side of the system;
the wavelength division multiplexing module comprises a triangular reflector, a concave reflector, a public filter and N filters, wherein the public filter is positioned at the focus F of the concave reflector;
the emergent optical fiber collimator group comprises N emergent optical fiber collimators, and the correlation relations between the N emergent optical fiber collimators and the N filter plates are in one-to-one correspondence;
light with N different wavelengths enters the wavelength division multiplexing module from the incident optical fiber collimator, and enters the N-th filter plate after being reflected by the triangular reflector;
the light with different wavelengths comprises classical signal light and quantum signal light;
part of classical signal light enters the Nth emergent optical fiber collimator and is output after being transmitted by the Nth filter plate; all the quantum signal light and part of the classical signal light are reflected by the Nth filter and output to the public filter;
repeating the following processes on all quantum signal light and part of classical signal light of the public filter plate until all signal light is reflected or transmitted:
process 1: the public filter plate reflects classical signal light and transmits quantum signal light to the concave reflector;
and (2) a process: the concave reflector receives the quantum signal light and then reflects the quantum signal light to the Mth filter plate;
and 3, process: the Mth filter plate transmits part of the quantum signal light to enter the Mth emergent optical fiber collimator and outputs the signal light, and the rest quantum signal light is reflected to the public filter plate by the Mth filter plate and jumps to the process 1;
wherein the M is sequentially increased according to the symmetry axis of the concave reflector. First, light rays to the left of the axis of symmetry will be reflected to the symmetric position to the right of the axis of symmetry and then to the next position to the left of the axis of symmetry. For example, from top to bottom can be expressed as: m, M +2, M +4, M +5, M +3, M +1, N, wherein the nth filter is not in the range of the horizontal projection of the concave reflector. The spot radius of the Gaussian beam is as follows:
Preferably, the incident optical fiber collimator includes an incident optical fiber and an incident lens, the incident optical fiber is connected to the incident lens, and the end of the incident lens is connected to the wavelength division multiplexing module.
Preferably, each exit collimator is composed of an exit optical fiber and the exit lens, and the exit optical fiber is connected with the exit lens.
Preferably, the common filter reflects signal light of a certain wavelength and transmits signal light of the remaining wavelengths.
Preferably, the N filter plates are positioned at one side of the wavelength division multiplexing module at an angle α;
the filter is an F-P filter. The filter plate is made of Ta2O5-SiO。
Preferably, the concave mirror is capable of reflecting the optical fiber passing through the focal point F as parallel light.
Preferably, the position of the focal point F of the concave mirror is determined by
Where r is the radius of curvature of the concave mirror.
Preferably, the incident optical fiber collimator and the emergent optical fiber collimator both adopt G-Lens optical fiber collimators.
Preferably, the distance between the incident optical fiber in the incident optical fiber collimator and the incident lens is adjustable;
the distance between the emergent optical fiber in the emergent optical fiber collimator and the emergent lens is adjustable.
The invention has the beneficial technical effects that:
in the wavelength division multiplexing module, a certain wavelength is filtered for multiple times through the common filter, so that the aim of greatly increasing the reflection isolation of other wavelengths to the certain wavelength is fulfilled.
The invention places the incident optical fiber collimator and the emergent optical fiber collimator at the same end, compared with the traditional wavelength division multiplexer that the sending end and the receiving end are respectively placed at the two ends, the volume of the wavelength division multiplexer is effectively reduced, and the structure is simple and easy to realize.
The invention adjusts the beam waist radius of the collimator by adjusting the distance between the optical fiber tail fibers and the lens of the incident optical fiber collimator and the emergent optical fiber collimator, finally reduces the divergence angle of the light beam and reduces the signal loss.
The invention can greatly reduce the interference of the classical signal to the quantum signal in the process of quantum-classical common fiber transmission. Under the condition of improving the isolation degree, the cost can be saved, more filter plates are prevented from being used, and the manufacturing complexity can be reduced.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a system for co-transmitting multi-wavelength signals in a common fiber according to the present invention.
Fig. 2 is a schematic diagram of a concave mirror in a system for co-transmitting multi-wavelength signals in a common fiber according to the present invention.
Fig. 3 is a schematic diagram of an optical fiber collimator used in a system for co-transmitting multi-wavelength signals in the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, a system for multi-wavelength signal common-fiber common transmission includes an incident fiber collimator, a wavelength division multiplexing module, and an exit fiber collimator set, wherein:
the incident optical fiber collimator is used for inputting signal light, the emergent optical fiber collimator group is used for outputting signal light, the incident optical fiber collimator and the emergent optical fiber collimator group are arranged at the same side of the system,
the wavelength division multiplexing module comprises a triangular reflector, a concave reflector, a public filter and N filter, wherein the public filter is positioned at the focal point F of the concave reflector, and the concave reflector can reflect light passing through the focal point F out in the form of parallel lightThe position of the focal point F of the concave mirror is
Where r is the radius of curvature of the concave mirror.
Specifically, the incident optical fiber collimator comprises an incident optical fiber and an incident lens, the incident optical fiber is connected with the incident lens, and the tail end of the incident lens is connected with the wavelength division multiplexing module; each emergent collimator comprises an emergent optical fiber and an emergent lens, the emergent optical fiber is connected with the emergent lens, and the front end of the emergent lens is connected with the wavelength division multiplexing module.
The incident optical fiber collimator and the emergent optical fiber collimator both adopt G-Lens optical fiber collimators, the distance between an incident optical fiber in the incident optical fiber collimator and the incident Lens is adjustable, and the distance between an emergent optical fiber in the emergent optical fiber collimator and the emergent Lens is adjustable. The G-Lens optical fiber collimator can adjust the distance between the optical fiber tail fiber of the emergent optical fiber or the incident optical fiber and the Lens according to the transmission wavelength and the condition of the error rate of the receiving end, thereby adjusting the beam waist radius of the emergent optical fiber collimator or the incident optical fiber collimator, finally reducing the divergence angle of the light beam and reducing the signal loss.
Specifically, the public filter and the concave reflector are sequentially fixed on the same side of the wavelength division multiplexing module, and the public filter reflects signal light with a certain wavelength and transmits signal light with other wavelengths; n piece filtering piece is fixed the opposite side that sets up at wavelength division multiplexing module in proper order, N piece filtering piece put in one side of wavelength division multiplexing module with alpha angle, alpha's expression as follows:
Further, the transmittance T and the half width of the pass band 2 Δ λ can be expressed as:
wherein:
the reflection phase of two boundaries of the transition layer, delta is the phase thickness of the spacing layer; r1，R2The reflectivity of two boundaries of the transition layer; m is the interference order. It can be seen from the above equation that the half width of the pass band of the filter depends on the interference order and the reflectivity of the reflective film, so that the half width of the pass band can be reduced by increasing the interference order and increasing the reflectivity.
More specifically, the passband bandwidth of the filter is narrower as the difference between the high and low refractive index of the material increases, so that the material of the filter can be selected to be Ta2O5-SiO2In which Ta2O5Has a refractive index of 2.06, SiO2Has a refractive index of 1.46.
The emergent optical fiber collimator group comprises N emergent optical fiber collimators, and the emergent optical fiber collimators correspond to the N filter plates one by one;
light with N different wavelengths enters the wavelength division multiplexing module from the incident optical fiber collimator, and firstly enters the N-th filter plate after being reflected by the triangular reflector, wherein the light with the different wavelengths comprises classical signal light and quantum signal light;
the classical signal light enters an Nth emergent optical fiber collimator and is output after being transmitted by an Nth filter plate; all the quantum signal light and part of the classical signal light are reflected by the Nth filter plate and output to the public filter plate;
repeating the following processes on all quantum signal light and part of classical signal light of the public filter plate until all signal light is reflected or transmitted:
process 1: the public filter plate reflects classical signal light and transmits quantum signal light to the concave reflector;
and (2) a process: the concave reflector receives the quantum signal light and then reflects the quantum signal light to the Mth filter plate;
and 3, process: the Mth filter plate transmits part of the quantum signal light to enter the Mth emergent optical fiber collimator and outputs the signal light, and the rest quantum signal light is reflected to the public filter plate by the Mth filter plate and jumps to the process 1;
wherein the M is sequentially increased according to the symmetry axis of the concave reflector. First, light rays to the left of the axis of symmetry will be reflected to the symmetric position to the right of the axis of symmetry and then to the next position to the left of the axis of symmetry. For example, from top to bottom can be expressed as: m, M +2, M +4, M +5, M +3, M +1, N, wherein the nth filter is not in the range of the horizontal projection of the concave reflector.
The optical fiber collimator can collimate the Gaussian beam output by the optical fiber into a beam with a smaller divergence angle, and the coupling loss is reduced.
The spot radius of the Gaussian beam is as follows:
From the above formula, the divergence angle and the beam waist radius are inversely proportional, that is, the larger the beam waist radius, the smaller the divergence angle, and the divergence angle is related to the wavelength of the incident light, when the wavelength division multiplexer is designed, the divergence angle can be reduced according to the characteristic of the gaussian beam, thereby reducing the loss of the signal, especially the loss of the quantum signal in weak light.
Specifically, the beam waist radius of a gaussian beam can be expressed as:
Taking the radius of curvature R of the lens to be 1.417mm and the refractive index n to be 1.74, the fiber pigtail has the maximum beam waist radius, omega, when it is 0.196mm away from the lens00.18mm, where the smallest divergence angle can be achieved.
In practice, however, in addition to a smaller divergence angle, the working distance of the fiber collimator should be considered, which is almost 0 when the fiber end face is located at the lens focus, i.e. the beam waist radius is at a maximum.
For the optical fiber collimator, the longest working distance is 2.25mm, and the beam waist radius omega is0Is 0.125 mm. Therefore, by adopting the G-Lens optical fiber collimator capable of finely adjusting the gap, the beam waist radius and the proper working distance of the collimator can be adjusted by adjusting the distance between the optical fiber pigtail and the Lens according to the transmission wavelength and the condition of the bit error rate of the receiving end, so that the divergence angle of the light beam is finally reduced, and the signal loss is reduced.
A specific example is given below with the value of N being 4.
A system for multi-wavelength signal common-fiber common transmission. The system comprises an incident fiber collimator 10, a wavelength division multiplexing module 20 and an emergent fiber collimator set 30. The incident fiber collimator 10 includes an incident fiber 11 and an incident lens 12, the wavelength division multiplexing module 20 includes a triangular reflector 21, a concave reflector 22, a common filter 23, a first filter 24, a second filter 25, a third filter 26, and a fourth filter 27, the emergent fiber collimator group 30 includes a first emergent fiber collimator 31, a second emergent fiber collimator 32, a third emergent fiber collimator 33, and a fourth emergent fiber collimator 34, each emergent fiber collimator is composed of an emergent fiber 35 and an emergent lens 36.
The incident light collimator 10 has an incident optical fiber 11 connected to an incident lens 12, and the end of the incident lens 12 is connected to a wavelength division multiplexing module 20. Public filter 23 and concave mirror 22 fix in proper order the right side of wavelength division multiplexing module 20, first filter 24, second filter 25, third filter 26, fourth filter 27 fix in proper order in the left side of wavelength division multiplexing module 20 to with first outgoing fiber collimator 31, second outgoing fiber collimator 32, third outgoing fiber collimator 33, fourth outgoing fiber collimator 34 one-to-one.
With four different wavelengths lambda1、λ2、λ3And λ4Is incident from the incident fiber 11 of the incident fiber collimator 10, where λ1Is classical signal light, lambda2、λ3And lambda4The quantum signal light is collimated by the incident lens 12, enters the wavelength division multiplexing module, is reflected by the triangular reflector 21, and enters the fourth filter 27, wherein lambda1Is transmitted by the fourth filter 27, enters the fourth exit fiber collimator 34 and is output. Lambda reflected by the fourth filter plate 272、λ3、λ4And contains a small amount of lambda1Is reflected to the common filter 23, with a small amount of lambda1Will be reflected by the common filter 23, lambda2、λ3And λ4Will be transmitted to the concave mirror 22. Lambda [ alpha ]2、λ3And λ4Is reflected by the concave mirror 22 to the first filter 24, where lambda2Is transmitted by the first filter 24, enters the first exit fiber collimator 31 and is output.
Lambda reflected by the first filter 243And λ4And contains a small amount of lambda1Is reflected to the common filter 23, with a small amount of lambda1Will be reflected by the common filter 23, lambda3And λ4Will be transmitted to the concave mirror 22. Lambda [ alpha ]3And λ4Is reflected by the concave mirror 22 to the third filter 26, where lambda3Is transmitted by the third filter 26, enters the third exit fiber collimator 33 and is output. Lambda reflected by the third filter segment 264And contains a small amount of lambda1Is reflected to the common filter 23, with a small amount of lambda1Will be reflected by the common filter 23, lambda4Will be transmitted to the concave mirror 22, finally lambda4The light is reflected to the second filter 25 and transmitted, enters the second emergent fiber collimator 32 and is output.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a system that multi-wavelength signal shared fibre passes, its characterized in that includes incident fiber collimator, wavelength division multiplexing module and emergent fiber collimator group, wherein:
the incident optical fiber collimator is used for inputting signal light, the emergent optical fiber collimator group is used for outputting signal light, and the incident optical fiber collimator and the emergent optical fiber collimator group are arranged on the same side of the system;
the wavelength division multiplexing module comprises a triangular reflector, a concave reflector, a public filter and N filters, wherein the public filter is positioned at the focus F of the concave reflector;
the emergent optical fiber collimator group comprises N emergent optical fiber collimators, and the correlation relations between the N emergent optical fiber collimators and the N filter plates are in one-to-one correspondence;
light with N different wavelengths enters from an incident optical fiber collimator, then enters a wavelength division multiplexing module, and enters an N-th filter plate after being reflected by the triangular reflector;
the light with different wavelengths comprises classical signal light and quantum signal light;
after being transmitted by the Nth filter plate, part of the classical signal light enters the Nth emergent optical fiber collimator and a Gaussian beam is output; all the quantum signal light and part of the classical signal light are reflected by the Nth filter plate and output to the public filter plate;
repeating the following processes at the position of the public filter plate until all the quantum signal light and part of the classical signal light are reflected or transmitted:
process 1: the public filter plate reflects classical signal light and transmits quantum signal light to the concave reflector;
and (2) a process: the concave reflector receives the quantum signal light and then reflects the quantum signal light to the Mth filter plate;
and 3, process: the Mth filter plate transmits part of the quantum signal light to enter the Mth emergent optical fiber collimator and outputs the signal light, and the rest quantum signal light is reflected to the public filter plate by the Mth filter plate and jumps to the process 1;
the spot radius of the Gaussian beam is as follows:
2. The system for co-propagating multiple wavelength signals according to claim 1, wherein the far field divergence angle is expressed as follows:
3. The system according to claim 1, wherein the incident fiber collimator comprises an incident fiber and an incident lens, the incident fiber is connected to the incident lens, and the end of the incident lens is connected to the wavelength division multiplexing module.
4. The system according to claim 1, wherein each exit fiber collimator comprises an exit fiber and an exit lens, the exit fiber is connected to the exit lens, and the front end of the exit lens is connected to the wavelength division multiplexing module.
5. A system for co-propagating multiple wavelength signals on a common fiber as claimed in claim 1, wherein said common filter reflects signal light of a certain wavelength and transmits signal light of the other wavelengths.
6. The system for multi-wavelength signal co-transmission with a fiber according to claim 1, wherein the N filters are placed at one side of the wdm module at an angle α, where α is expressed as follows:
the filter is an F-P filter, and the filter is made of Ta2O5-SiO。
7. The system according to claim 1, wherein said concave mirror reflects the optical fiber passing through the focal point F as parallel light.
8. The system for co-propagating multiple wavelength signals according to claim 1, wherein the position of the focal point F of the concave mirror is defined by
Where r is the radius of curvature of the concave mirror.
9. The system for co-propagating multiple wavelength signals according to claim 1, wherein said incident fiber collimator and said emergent fiber collimator both use G-Lens fiber collimators.
10. The system for co-propagating multiple wavelength signals according to claim 8, wherein the distance between the incident optical fiber of the incident optical fiber collimator and the incident lens is adjustable;
the distance between the emergent optical fiber in the emergent optical fiber collimator and the emergent lens is adjustable.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113448017A (en) * | 2021-07-15 | 2021-09-28 | 陕西澳威激光科技有限公司 | Combo-PON WDM photoelectric device and preparation method thereof |
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| US20060198576A1 (en) * | 2002-11-01 | 2006-09-07 | Omron Corporation | Optical multiplexer/demultiplexer and production method for optical multiplexer/demultiplexer |
| CN106019484A (en) * | 2015-12-30 | 2016-10-12 | 杭州埃戈光电科技有限公司 | Wavelength division multiplexer capable of being integrated in CFP and CFP2 standard high-speed transceivers |
| CN206638856U (en) * | 2017-03-24 | 2017-11-14 | 清远市亿源通光电科技有限公司 | A kind of wavelength division multiplexer |
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| CN1708708A (en) * | 2002-11-01 | 2005-12-14 | 欧姆龙株式会社 | Optical multiplexer/demultiplexer and production method for optical multiplexer/demultiplexer |
| US20060198576A1 (en) * | 2002-11-01 | 2006-09-07 | Omron Corporation | Optical multiplexer/demultiplexer and production method for optical multiplexer/demultiplexer |
| CN106019484A (en) * | 2015-12-30 | 2016-10-12 | 杭州埃戈光电科技有限公司 | Wavelength division multiplexer capable of being integrated in CFP and CFP2 standard high-speed transceivers |
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