CN111290089A - Multi-wavelength coupling light emitting device - Google Patents
Multi-wavelength coupling light emitting device Download PDFInfo
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- CN111290089A CN111290089A CN202010292749.3A CN202010292749A CN111290089A CN 111290089 A CN111290089 A CN 111290089A CN 202010292749 A CN202010292749 A CN 202010292749A CN 111290089 A CN111290089 A CN 111290089A
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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
- G02B6/4213—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being polarisation selective optical elements
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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
- G02B6/42—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
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
- G02B6/4208—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback using non-reciprocal elements or birefringent plates, i.e. quasi-isolators
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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
- G02B6/4266—Thermal aspects, temperature control or temperature monitoring
- G02B6/4268—Cooling
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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
- G02B6/4274—Electrical aspects
- G02B6/428—Electrical aspects containing printed circuit boards [PCB]
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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
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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Abstract
The embodiment of the application provides a multi-wavelength coupling light emitting device, and relates to the technical field of optical instruments. The multi-wavelength coupling light emitting device comprises a collimating lens, a half-wave plate, a polarization beam combiner and a beam combiner, wherein the half-wave plate is used for deflecting a first polarized light signal group, and the first polarized light signal group at least comprises two beams of polarized light signals; the polarization beam combining mirror is arranged behind the half-wave plate, and the first polarization light signal group is incident to the first surface of the polarization beam combining mirror and reflected by the polarization beam combining mirror; the second polarized light signal group is incident to the second surface of the polarization beam combining mirror and is transmitted, and polarized light signals in the second polarized light signal group and polarized light signals in the first polarized light signal group are pairwise combined into a third polarized light signal group; the beam combiner is arranged in front of the first surface of the polarization beam combiner and used for combining and transmitting the polarized light signals in the third polarized light signal group. The multi-wavelength coupling light emitting device can achieve the technical effects of simplifying the structure of an optical path, achieving the process and reducing the wavelength-dependent loss.
Description
Technical Field
The application relates to the technical field of optical devices, in particular to a multi-wavelength coupling light emitting device.
Background
At present, an optical module is an important component of a modern optical communication network, and provides a physical channel of Gbit high-speed data for the communication network, and an optical transmitter is the most core component in the optical module. With the rapid construction and upgrading of the current data center network, the data center puts forward requirements on multiple wavelength channels, high speed, small size, low cost and the like for the optical module.
In the prior art, the IEEE has defined four-wavelength and eight-wavelength based LAN WDM, CWDM standards for data center applications. For the multi-wavelength light emitting device, the scheme of the dielectric thin film filter is a multi-wavelength beam combination scheme which is commonly used at present, but the existing scheme still has some defects and challenges, such as inconsistent propagation optical paths of various wavelengths, obvious wavelength-dependent loss, complex structure of an eight-wavelength combined optical path, large size of an optical device and the like.
Disclosure of Invention
An object of the embodiments of the present application is to provide a multi-wavelength coupling light emitting device, which can achieve the technical effects of simplifying the structure of an optical path, implementing a process, and reducing wavelength-dependent loss.
The embodiment of the application provides a multi-wavelength coupling light emitting device, which comprises a half-wave plate, a polarization beam combiner and a beam combiner, wherein the half-wave plate is used for deflecting a first polarized light signal group, and the first polarized light signal group at least comprises two beams of polarized light signals; the polarization beam combining mirror is arranged behind the half-wave plate, and the first polarization optical signal group is incident to a first surface of the polarization beam combining mirror and reflected by the polarization beam combining mirror; the second polarized light signal group is incident to the second surface of the polarization beam combining mirror and is transmitted, and polarized light signals in the second polarized light signal group and polarized light signals of the first polarized light signal group are pairwise combined into a third polarized light signal group; the beam combiner is arranged in front of the first surface of the polarization beam combiner and used for combining and transmitting the polarized light signals in the third polarized light signal group.
In the implementation process, the multi-wavelength coupling light emitting device rotates the polarization state of the polarized light of the first polarized light signal group by 90 degrees through a half-wave plate, then combines the first polarized light signal group and the second polarized light signal group into a third polarized light signal group in pairs through a polarization beam combiner, so that each group of polarized light signals combined in the third polarized light signal group are orthogonal to each other, and finally combines the third polarized light signal into a beam through a beam combiner and emits the beam; therefore, the multi-wavelength coupling light emitting device can combine the polarized light signals into the polarized light signals which are orthogonal with each other pairwise through the polarization beam combiner, and the technical effects of simplifying the light path structure, realizing the process and reducing the wavelength-dependent loss can be realized.
The device further comprises a first laser group and a first collimation lens group, wherein the first laser group is arranged in front of the half-wave plate and used for emitting the polarized light signals of the first polarized light signal group; the first collimating lens group is arranged between the first laser group and the half-wave plate and is used for collimating the polarized light signals of the first polarized light signal group.
In the implementation process, the first laser group is used for generating and emitting the polarized light signals of the first polarized light signal group, and the first collimating lens group collimates the polarized light signals of the first polarized light signal group.
The device further comprises a second laser group and a second collimating lens group, wherein the second laser group is arranged in front of the second surface of the polarization beam combiner and is used for emitting the second polarized light signal group; the second collimating lens group is arranged between the second laser group and the polarization beam combiner and is used for collimating the polarized light signals of the second polarized light signal group.
In the implementation process, the second laser group is used for generating and emitting the polarized light signals of the second polarized light signal group, and the second collimating lens group collimates the polarized light signals of the second polarized light signal group.
Furthermore, the beam combiner is a wavelength division optical multiplexer, the wavelength division optical multiplexer includes a plurality of input ends and an output end, and the input ends of the wavelength division optical multiplexer correspond to the polarized light signals of the third polarized light signal group in a one-to-one correspondence manner.
In the implementation process, the wavelength division optical multiplexer uses a wavelength division multiplexing technology to combine two or more optical carrier signals (carrying various information) with different wavelengths together at a sending end through the multiplexer, and the optical carrier signals are coupled to the same optical fiber of an optical line for transmission.
Further, the device also comprises a converging lens which is arranged behind the output end of the wavelength division optical multiplexer.
In the implementation process, the converging lens can further converge the optical signal after the third polarized optical signal is combined, so that the transmission efficiency of the optical signal is improved.
Further, the beam combiner is a large-light-passing-aperture converging lens.
In the implementation process, the large-clear-aperture converging lens can enable each optical signal in the third polarized optical signal group to realize spatial beam combination; compared with a wavelength division multiplexer, the wavelength division multiplexer has the problem of difficult debugging, but has the advantages of simple structure and low cost.
Further, the apparatus further includes an optical fiber disposed behind the beam combiner and configured to transmit the polarized optical signal after the third polarized optical signal is combined.
In the implementation process, the optical fiber is made of glass or plastic by utilizing the transmission principle of 'total emission of light', can be used as a light conduction tool, and has the advantages of wide frequency band, light weight, strong anti-interference capability, high fidelity and reliable working performance.
Further, the device also comprises an optical isolator which is arranged between the optical fiber and the beam combiner.
In the implementation process, the optical isolator is a passive optical device which only allows unidirectional light to pass through, and the working principle of the optical isolator is based on the non-reciprocity of Faraday rotation. The light reflected by the optical fiber echo can be well isolated by the optical isolator, and the light wave transmission efficiency is improved.
Further, the device also comprises a circuit board, wherein a first part of the circuit board is arranged in front of the second surface of the polarization beam combiner, and a second part of the circuit board is arranged in front of the half-wave plate.
In the above implementation process, the circuit board may be referred to as a printed circuit board or a printed circuit board, and provides electronic hardware support for the multi-wavelength coupled light emitting device.
Further, the apparatus further comprises a heat sink, a first portion of the heat sink is disposed between the first portion of the circuit board and the second face of the polarization beam combiner, and a second portion of the heat sink is disposed between the second portion of the circuit board and the half-wave plate.
In the above implementation, the heat sink is a material with high thermal conductivity, such as copper metal. Since devices (such as laser diodes) generating optical signals generate more heat during operation, the devices generating optical signals need to be mounted on a heat sink to help heat dissipation, thereby stabilizing the operating temperature and improving the stability and safety of the devices.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic block diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application;
FIG. 3 is a schematic block diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or a point connection; either directly or indirectly through intervening media, or may be an internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The embodiment of the application provides a multi-wavelength coupling light emitting device, which can be applied to optical devices, such as coupling beam combination of multi-wavelength polarized light; the multi-wavelength coupling light emitting device rotates the polarization state of the polarized light of the first polarized light signal group by 90 degrees through a half-wave plate, then combines the first polarized light signal group and the second polarized light signal group into a third polarized light signal group through a polarization beam combining mirror, so that each group of polarized light signals combined in the third polarized light signal group are orthogonal to each other, and finally combines the third polarized light signal into a beam of signal through a beam combiner and emits the signal; therefore, the multi-wavelength coupling light emitting device can combine the polarized light signals into the polarized light signals which are orthogonal with each other pairwise through the polarization beam combiner, and the technical effects of simplifying the light path structure, realizing the process and reducing the wavelength-dependent loss can be realized.
Referring to fig. 1, fig. 1 is a schematic block diagram of a multi-wavelength coupled light emitting device provided in an embodiment of the present application, where the multi-wavelength coupled light emitting device includes a half-wave plate 100, a polarization beam combiner 200, and a beam combiner 300.
Illustratively, the half-wave plate 100 is used to deflect a first set of polarized optical signals, which includes at least two polarized optical signals.
Illustratively, the half-wave plate 100 is a birefringent crystal with a thickness such that when normally incident light is transmitted, the phase difference between the ordinary light (o-light) and the extraordinary light (e-light) is equal to pi or an odd multiple thereof, and such a wafer is called a half-wave plate, or simply a half-wave plate. In the multi-wavelength coupled light emitting device, the half-wave plate functions to rotate the polarization state of the first polarized light signal group by 90 °.
Exemplarily, the polarization beam combiner 200 is disposed behind the half-wave plate 100, and the first polarized light signal is incident to a first surface of the polarization beam combiner 200 and reflected by the polarization beam combiner 200; the second polarized light signal group is incident to the second surface of the polarization beam combining mirror 200 and is transmitted, and the polarized light signals in the second polarized light signal group and the polarized light signals in the first polarized light signal group are pairwise combined to form a third polarized light signal group.
Illustratively, the first and second polarized optical signal sets have the same polarization state before being incident on the polarization beam combiner 200; after the polarized light signals in the second polarized light signal group and the polarized light signals in the first polarized light signal group are pairwise combined to form a third polarized light signal group, the polarization states of each pair of polarized light signals in the third polarized light signal group are orthogonal to each other due to the effect of the half-wave plate.
Illustratively, a Polarization Beam Splitter (PBS) includes a polarizing beam splitter (Thin Film Polarizer) that reflects one polarization state and transmits the other polarization state, so that two beams of light with different polarizations from different directions are combined.
Illustratively, the beam combiner 300 is disposed in front of the first surface of the polarization beam combiner 200, and is configured to combine and transmit the polarized optical signals in the third polarized optical signal group.
For example, the beam combiner 300 may combine the polarized optical signals of the third polarized optical signal group into one beam, thereby achieving the technical effect of combining the polarized optical signals of the first polarized optical signal group and the second polarized optical signal group into one beam.
Optionally, the combiner 300 is a wavelength division optical multiplexer, the wavelength division optical multiplexer includes a plurality of input ends and an output end, and the input ends of the wavelength division optical multiplexer correspond to the polarized light signals of the third polarized light signal group in a one-to-one correspondence.
Illustratively, the Wavelength division Multiplexer combines optical carrier signals (carrying various information) of two or more different wavelengths together at a transmitting end via a Multiplexer (also called a Multiplexer) using a Wavelength Division Multiplexing (WDM) technology, and couples the optical carrier signals into the same optical fiber of an optical line for transmission; in other words, the wavelength division optical multiplexer can achieve the technical effect of simultaneously transmitting two or more optical signals with different wavelengths in the same optical fiber.
Optionally, the multi-wavelength coupled light emitting device further comprises a converging lens disposed after the output end of the wavelength division optical combiner.
Illustratively, the converging lens may further converge the optical signal after the third polarized optical signal is combined, thereby improving the transmission efficiency of the optical signal.
Optionally, the beam combiner 300 is a large clear aperture converging lens.
Illustratively, the large clear aperture converging lens may spatially combine the individual optical signals of the third set of polarized optical signals; compared with a wavelength division multiplexer, the wavelength division multiplexer has the problem of difficult debugging, but has the advantages of simple structure and low cost.
In some implementation scenarios, the multi-wavelength coupled light emitting device rotates the polarization state of the polarized light of the first polarized light signal group by 90 ° through the half-wave plate 100, then combines the first polarized light signal group and the second polarized light signal group into a third polarized light signal group in pairs through the polarization beam combiner 200, so that each group of polarized light signals combined in the third polarized light signal group are orthogonal to each other, and finally combines the third polarized light signals into a single signal through the beam combiner 300 and emits the signal; therefore, the multi-wavelength coupling light emitting device can combine the polarized light signals into the polarized light signals which are orthogonal with each other pairwise through the polarization beam combiner, and the technical effects of simplifying the light path structure, realizing the process and reducing the wavelength-dependent loss can be realized.
Please refer to fig. 2, fig. 2 is a block diagram of an embodiment of the present applicationA schematic block diagram of a multi-wavelength coupled light emitting device is provided, which comprises a half-wave plate 100, a polarization beam combiner 200, a wavelength division light combiner 310, a converging lens 311, a first laser group 410, a first collimating lens group 420, a second laser group 510, a second collimating lens group 520, a light guide fiber 600, an optical isolator 700, a circuit board 800 and a heat sink 900, wherein
And "●" represents the polarization state of the polarized optical signal.
The half-wave plate 100, the polarization beam combiner 200, the wavelength division optical multiplexer 310, and the focusing lens 311 are already described above, and are not described herein again to avoid repetition.
Illustratively, a first laser group 410 and a first collimating lens group 420, wherein the first laser group 410 is disposed in front of the half-wave plate 100 for emitting a polarized optical signal of a first polarized optical signal group; the first collimating lens group 420 is disposed between the first laser group 410 and the half-wave plate 100, and is used for collimating the polarized light signals of the first polarized light signal group.
Illustratively, a second laser group 510 and a second collimating lens group 520, wherein the second laser group 510 is disposed in front of the second face of the polarization beam combiner 200 for emitting a second polarized optical signal group; the second collimating lens group 520 is disposed between the second laser group 510 and the polarization beam combiner 200, and is configured to collimate the polarized light signals of the second polarized light signal group.
The lasers in the laser group may be semiconductor lasers, for example. Semiconductor lasers, also known as Laser Diodes (LDs), are lasers using semiconductor materials as the working substance. Due to the difference in material structure, the specific process of generating laser light in different types is more specific. Common working substances are gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), and the like. The excitation mode includes three modes of electric injection, electron beam excitation and optical pumping. Semiconductor laser devices can be classified into homojunctions, single heterojunctions, double heterojunctions, and the like. The homojunction laser and the single heterojunction laser are mostly pulse devices at room temperature, and the double heterojunction laser can realize continuous work at room temperature.
Among them, laser diodes include Single Heterojunction (SH), Double Heterojunction (DH), and Quantum Well (QW) laser diodes. The quantum well laser diode has the advantages of low threshold current and high output power, and is a mainstream product for market application. Compared with a laser, the laser diode has the advantages of high efficiency, small volume and long service life, but the output power is small (generally less than 2mW), the linearity is poor, and the monochromaticity is not good, so that the application of the laser diode in a cable television system is greatly limited, and multi-channel and high-performance analog signals cannot be transmitted. In the return module of the bidirectional optical receiver, a quantum well laser diode is generally used as a light source for uplink transmission.
Illustratively, a collimating lens refers to a device that can transform light from each point in an aperture stop into a parallel beam of collimated light.
Illustratively, the optical fiber 600 is disposed behind the beam combiner 300 for transmitting the polarized optical signal after the third polarized optical signal is combined.
In the above implementation, the optical fiber may be a single mode optical fiber. In the Single Mode Fiber (SMF), the core glass is thin (the core diameter is typically 9 or 10 μm), and only one mode of fiber can be transmitted. Therefore, the dispersion between modes is very small, and the fiber is suitable for remote communication, but material dispersion and waveguide dispersion exist, so that the single-mode fiber has higher requirements on the spectral width and stability of a light source, namely the spectral width is narrow and the stability is good. It was later discovered that at 1.31 μm wavelength, the material dispersion and waveguide dispersion of single mode fibers were both positive and negative and were also exactly equal in magnitude. Thus, the 1.31 μm wavelength region is an ideal working window for optical fiber communication, and the main parameters of the 1.31 μm conventional single mode fiber, which is the main working band of the fiber communication system in use, are determined by the international telecommunication union ITU-T in the G652 recommendation, so this fiber is also called G652 fiber.
Compared with multimode fiber, the single-mode fiber can support longer transmission distance, and in 100Mbps Ethernet and up to 1G gigabit network, the single-mode fiber can support transmission distance exceeding 5000 m.
From a cost perspective, the cost of using single mode fiber can be higher than that of multimode fiber optic cables because optical transceivers are very expensive.
The refractive index distribution is similar to that of a mutant type optical fiber, the diameter of a fiber core is only 8-10 mu m, and light rays are transmitted along the central axis direction of the fiber core in a straight line shape. Since such a fiber can only transmit one mode (degeneracy of two polarization states), it is called a single-mode fiber, and its signal distortion is small.
Illustratively, an optical isolator 700 is disposed between the optical fiber 600 and the combiner 300.
Illustratively, optical isolator 700 is a passive optical device that allows only one-way light to pass through, and its operating principle is based on the non-reciprocity of faraday rotation. The light reflected by the fiber echo can be well isolated by the optical isolator. The optical isolator mainly utilizes the faraday effect of the magneto-optical crystal. The characteristics of the optical isolator are: the forward insertion loss is low, the reverse isolation degree is high, and the return loss is high. The optical isolator is a passive device which allows light to pass through in one direction and prevents the light from passing through in the opposite direction, and the optical isolator has the function of limiting the direction of the light, so that the light can be transmitted in a single direction only, and the light reflected by the optical fiber echo can be well isolated by the optical isolator, so that the light wave transmission efficiency is improved.
Illustratively, a first portion of the circuit board 800 is disposed in front of the second side of the polarization beam combiner 200, and a second portion of the circuit board 800 is disposed in front of the half-wave plate 100.
Illustratively, the Circuit Board 800 may be referred to as a Printed Circuit Board or Printed Circuit Board (PCB) to provide electronic hardware support for the multi-wavelength coupled light emitting device.
Illustratively, a first portion of the heat sink 900 is disposed between the first portion of the circuit board 800 and the second face of the polarization beam combiner 200, and a second portion of the heat sink 900 is disposed between the second portion of the circuit board 800 and the half-wave plate 100.
Illustratively, the heat sink 900 is a high thermal conductivity material, such as metallic copper. Since devices (such as laser diodes, etc.) generating optical signals generate more heat during operation, the devices generating optical signals need to be mounted on the heat sink 900 to help dissipate heat, thereby stabilizing the operating temperature and improving the stability and safety of the devices.
Alternatively, heat sink 900 may be an L-shaped right angle heat sink.
In some embodiments, the first laser group 410 and the second laser group 510 in the multi-wavelength coupled light emitting device each include two semiconductor (LD) lasers; four-way LD lasers are parallelly attached to the L-shaped right-angle heat sink 900, wherein the four-way LD lasers respectively emit different wavelengths of lambda 1, lambda 2, lambda 3 and lambda 4, and the lambda 1 and the lambda 3 are vertically arranged with the two groups of beams of lambda 2 and lambda 4; the four LD light polarizations are all parallel. And a collimating lens is arranged in front of each path of LD laser to realize the collimation of four paths of wavelength beams. The lambda 2 and lambda 4 light beams pass through the half-wave plate 100, and an included angle between the vibration state of the linearly polarized light when the half-wave plate 100 is incident and the main section of the crystal of the half-wave plate is set to be 45 degrees, so that the vibration state of the transmitted linearly polarized light is rotated by 90 degrees from the original direction. Therefore, the polarization states of λ 1 and λ 3 are orthogonal to the polarization states of λ 2 and λ 4. The gluing plane of the polarization beam combiner 200 is plated with a polarization beam splitting film, so that the optical signals λ 2 and λ 4 with vertical polarization states are reflected, and the optical signals λ 1 and λ 3 with parallel polarization states are transmitted. Thereby the four light beams are polarized and combined into 2 parallel light beams.
In addition, two groups of parallel light beams of lambda 1 and lambda 2 and lambda 3 and lambda 4 are input into the wavelength division light combiner, the wavelength division light combiner is composed of 2 dielectric thin film filters and high reflection films, and wavelength division light combination of four wavelengths of lambda 1 and lambda 2 and lambda 3 and lambda 4 can be simply realized. The combined four paths of light wavelengths are converged by a converging lens and then efficiently coupled into a single mode fiber through an isolator.
Obviously, the multi-wavelength coupling light emitting device can be expanded to combine and couple more different wavelength light beams, such as eight different wavelength light beams.
In some embodiments, the beam combiner 300 may employ a large clear aperture converging lens; referring to fig. 3, fig. 3 is a schematic structural diagram of a multi-wavelength coupled light emitting device according to an embodiment of the present application, where the multi-wavelength coupled light emitting device includes a half-wave plate 100, a polarization beam combiner 200, and a large-pass aperture converging lensMirror 320, first laser group 410, first collimating lens group 420, second laser group 510, second collimating lens group 520, fiber optic 600, optical isolator 700, circuit board 800, and heat sink 900, wherein
And "●" represents the polarization state of the polarized optical signal.
Illustratively, the two sets of parallel beam spacings λ 1, λ 2 and λ 3, λ 4 are dependent on the spacing d of the individual lasers in the first and second laser groups 410, 510, typically d being several hundred microns. The large-aperture converging lens 320 combines the two groups of dense parallel beams and couples the beams into the optical fiber 600, and the optical fiber 600 is a thermal core-expanding fiber, thereby improving the coupling efficiency.
Alternatively, the optical fiber 600 may be a fiber lens, such as a spherical or conical lens.
Illustratively, Thermally expanded core fibers (TEC fibers) are a new type of micro-lens fibers, which are mainly characterized in that the local core diameter of the fiber is larger than that of a conventional single-mode fiber, and the outer cladding radius is kept constant.
Similarly, the multi-wavelength coupling light emitting device can be expanded to combine and couple more different wavelength light beams, such as eight different wavelength light beams.
In some embodiments, the first laser group 410 may include two or more lasers; and correspondingly, the first collimating lens group 420, the second laser group 510 and the second collimating lens group 520 are correspondingly arranged. Referring to fig. 4, fig. 4 is a diagram illustrating a multi-wavelength coupled light emitting device according to an embodiment of the present disclosure.
Exemplarily, in the multi-wavelength coupled light emitting device, the first laser group 410 includes 4 lasers; accordingly, the first collimating lens group 420 includes 4 collimating lenses, the second laser group 510 includes 4 lasers, and the second collimating lens group 520 includes 4 collimating lenses.
Alternatively, the multi-wavelength coupled light emitting device can be expanded to combine and couple more light beams with different wavelengths as required.
In some implementation scenarios, the multi-wavelength coupled light emitting device rotates the polarization state of the polarized light of the first polarized light signal group by 90 ° through the half-wave plate 100, then combines the first polarized light signal group and the second polarized light signal group into a third polarized light signal group in pairs through the polarization beam combiner 200, so that each group of polarized light signals combined in the third polarized light signal group are orthogonal to each other, and finally combines the third polarized light signals into a single signal through the beam combiner 300 and emits the signal; therefore, the multi-wavelength coupling light emitting device can combine the polarized light signals into the polarized light signals which are orthogonal with each other pairwise through the polarization beam combiner, and the technical effects of simplifying the light path structure, realizing the process and reducing the wavelength-dependent loss can be realized.
In addition, in some implementation scenes, the multi-wavelength coupling light emitting device has a simple optical path structure, is beneficial to reducing the size of a multi-wavelength light emitting device, and can also reduce the optical path difference of multiple wavelengths of LAN and WDM, thereby improving the wavelength-dependent loss and the consistency of the light emitting power.
In all embodiments of the present application, the terms "large" and "small" are relatively speaking, and the terms "upper" and "lower" are relatively speaking, so that descriptions of these relative terms are not repeated herein.
It should be appreciated that reference throughout this specification to "in this embodiment," "in an embodiment of the present application," or "as an alternative implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in this embodiment," "in the examples of the present application," or "as an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are all alternative embodiments and that the acts and modules involved are not necessarily required for this application.
In various embodiments of the present application, it should be understood that the size of the serial number of each process described above does not mean that the execution sequence is necessarily sequential, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A multi-wavelength coupling light emitting device is characterized by comprising a half-wave plate, a polarization beam combiner and a beam combiner,
the half-wave plate is used for deflecting a first polarized light signal group, and the first polarized light signal group at least comprises two polarized light signals;
the polarization beam combining mirror is arranged behind the half-wave plate, and the first polarization optical signal group is incident to a first surface of the polarization beam combining mirror and reflected by the polarization beam combining mirror; the second polarized light signal group is incident to the second surface of the polarization beam combining mirror and is transmitted, and polarized light signals in the second polarized light signal group and polarized light signals of the first polarized light signal group are pairwise combined into a third polarized light signal group;
the beam combiner is arranged in front of the first surface of the polarization beam combiner and used for combining and transmitting the polarized light signals in the third polarized light signal group.
2. The multi-wavelength coupled light emitting device according to claim 1, further comprising a first group of lasers and a first group of collimating lenses,
the first laser group is arranged in front of the half-wave plate and used for transmitting the polarized light signals of the first polarized light signal group;
the first collimating lens group is arranged between the first laser group and the half-wave plate and is used for collimating the polarized light signals of the first polarized light signal group.
3. The multi-wavelength coupled light emitting device according to claim 1, further comprising a second group of lasers and a second group of collimating lenses,
the second laser group is arranged in front of the second surface of the polarization beam combiner and used for transmitting the second polarized optical signal group;
the second collimating lens group is arranged between the second laser group and the polarization beam combiner and is used for collimating the polarized light signals of the second polarized light signal group.
4. The apparatus according to claim 1, wherein the combiner is a wavelength division optical combiner, the wavelength division optical combiner comprises a plurality of inputs and an output, and the inputs of the wavelength division optical combiner are in one-to-one correspondence with the polarized optical signals of the third polarized optical signal group.
5. The apparatus according to claim 4, further comprising a converging lens disposed after the output of said wavelength division optical combiner.
6. The multi-wavelength coupled light emitting device according to claim 1, wherein the beam combiner is a large clear aperture converging lens.
7. The apparatus according to claim 1, further comprising an optical fiber disposed behind the beam combiner for transmitting the combined polarized light signal of the third polarized light signal.
8. The multi-wavelength coupled light emitting device according to claim 7, further comprising an optical isolator disposed between said optical fiber and said beam combiner.
9. The apparatus according to claim 1, further comprising a circuit board, a first portion of the circuit board being disposed in front of the second face of the polarization beam combiner, a second portion of the circuit board being disposed in front of the half-wave plate.
10. The apparatus according to claim 9, further comprising a heat sink, a first portion of the heat sink being disposed between the first portion of the circuit board and the second side of the polarization beam combiner, a second portion of the heat sink being disposed between the second portion of the circuit board and the half-wave plate.
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