CN102611505B - Light emitting device for multi-wavelength high-speed transmission - Google Patents
Light emitting device for multi-wavelength high-speed transmission Download PDFInfo
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- CN102611505B CN102611505B CN201210088935.0A CN201210088935A CN102611505B CN 102611505 B CN102611505 B CN 102611505B CN 201210088935 A CN201210088935 A CN 201210088935A CN 102611505 B CN102611505 B CN 102611505B
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Abstract
The invention relates to a light emitting device for multi-wavelength high-speed transmission. The light emitting device comprises a plurality of lasers, at least one filter plate and a polarizing beam combiner, wherein the plurality of lasers can produce laser beams with different wavelengths respectively; the laser beams with different wavelengths form at least two new beams by the filter plate; the new beams are combined by the polarizing beam combiner so as to couple into the same optical fiber. The light emitting device can greatly simplify the manufacture of the filter plate and improve the freedom and the flexibility of multiple lasers in placing, thereby achieving small package in low cost.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of for the light emitting devices in multi-wavelength two-forty signal transmission technology.
Background technology
Along with HD video, the information explosion formula that the application of the communication technologys such as 3G, LTE and the universal of the Internet bring increases, and communication network is faced with increasing bandwidth and increases pressure.Traditional 10G transmission technology has been not enough to the bandwidth demand meeting today, and development 40G/100G transmission technology has become inevitable.But to the escalation process of 40G/100G, face lot of challenges from traditional 10G network.Wherein, the most important thing is the 40G/100G optics of developing low-cost and compact.
The 40G/100G light emitting devices of generally acknowledging at present is integrated together by the signal of the 10G/25G of 4 wavelength.But existing scheme has many shortcomings.Fig. 1 is the structural representation of a kind of light emitting devices of the prior art.In above-mentioned prior art, the light of four wavelength is integrated in monomode fiber by AWG (array waveguide grating).The program has simplicity of design, the advantage of compact conformation.But AWG ten points of costlinesses, its insertion loss is larger.Another shortcoming based on AWG scheme is the restriction being difficult to use the TO laser of low cost due to waveguide spacing.Therefore the encapsulation technology being different from traditional TOSA completely need be developed.
Fig. 2 is the structural representation of another kind of light emitting devices of the prior art.It uses traditional optical means three blooming pieces (general diaphragm is with 45 degree of placements) to be combined in an optical fiber by the light of four wavelength.Traditional laser TO can be directly used in the program.But because adjacent two wavelength spacing are very little, the requirement of the program to diaphragm is high.The light of different wave length will have different transmission ranges simultaneously.Therefore first the light sent from laser collimate to reduce to the requirement of diaphragm and reach identical coupling efficiency by General Requirements.And the volume of the program is comparatively large, be difficult to miniaturized optical module.
Summary of the invention
The object of the invention is to overcome the deficiency that above-mentioned prior art exists, provide a kind of light emitting devices of new version to be applied to multi-wavelength two-forty especially in 40G/100G optical transport technology.Light emitting devices of the present invention can improve the degree of freedom and the flexibility of the placement of four lasers, to realize the low cost small-sized encapsulated of light emitting devices.
In order to reach foregoing invention object, technical scheme provided by the invention is as follows:
A kind of light emitting devices for multi-wavelength high rate data transmission, it is characterized in that, this light emitting devices includes multiple laser, at least one filter plate and polarization beam combiner, the laser beam of different wave length launched respectively by multiple laser, the laser beam of different wave length forms at least two new light beams by filter plate, and new light beam combines to be coupled in same optical fiber by polarization beam combiner.
The present invention is used in the light emitting devices of multi-wavelength high rate data transmission, this light emitting devices includes laser, 45 degree of filter plates and polarization beam combiner, 4 kinds of different wave length λ 1 that four lasers send, λ 2, the light beam of λ 3 and λ 4, wherein, λ 1 < λ 2 < λ 3 < λ 4, wavelength is that two light beams of λ 1 and λ 3 are combined into the first new light beam through 45 degree of filter plates, wavelength is that two light beams of λ 2 and λ 4 are combined into the second new light beam through 45 degree of filter plates, the polarization direction 90-degree rotation of polarization direction new light beam compared with first of the described second new light beam, first new light beam and the second new light beam combine to be coupled in same optical fiber through a polarization beam combiner.
Be used in the light emitting devices of multi-wavelength two-forty especially 40G/100G transmission in the present invention, the described first new light beam includes from the wavelength of the one 45 degree of filter plate transmission to be the light beam of λ 1 and to be the light beam of λ 3 from the wavelength that 45 degree of filter plates reflect.
Be used in the light emitting devices of multi-wavelength two-forty especially 40G/100G transmission in the present invention, the described second new light beam includes from the wavelength of the 2 45 degree of filter plate transmission to be the light beam of λ 2 and to be the light beam of λ 4 from the wavelength that 45 degree of filter plates reflect.
Be used in the light emitting devices of multi-wavelength high rate data transmission in the present invention, the described first new light beam and the second new light beam are incident in two vertical direction of polarization beam combiner.
Be used in the present invention, in the light emitting devices of multi-wavelength high rate data transmission, the light path of the described first new light beam being provided with a half-wave plate.
A kind of light emitting devices for multi-wavelength high rate data transmission, it is characterized in that, this light emitting devices includes laser, 45 degree of filter plates and polarization beam combiner, 4 kinds of different wave length λ 1 that four lasers send, λ 2, the light beam of λ 3 and λ 4, wherein, λ 1 < λ 2 < λ 3 < λ 4, wavelength is that two light beams of λ 1 and λ 3 are combined into the first new light beam through 45 degree of filter plates, wavelength is that two light beams of λ 2 and λ 4 are combined into the second new light beam through 45 degree of filter plates, the polarization direction of the described second new light beam is identical with the polarization direction of the first new light beam, first new light beam and the second new light beam are incident to two opposite faces of polarization beam combiner with identical polarization direction, the reflection direction of polarization beam combiner to the first new light beam or the second new light beam is placed with a completely reflecting mirror and a quarter-wave plate, the reflection new light beam in Hou mono-tunnel and the new light beam in another road combine to be coupled in same optical fiber.
Be used in the light emitting devices of multi-wavelength high rate data transmission in the present invention, the described first new light beam includes from the wavelength of the one 45 degree of filter plate transmission to be the light beam of λ 1 and to be the light beam of λ 3 from the wavelength that 45 degree of filter plates reflect.
Be used in the light emitting devices of multi-wavelength high rate data transmission in the present invention, the described second new light beam includes from the wavelength of the 2 45 degree of filter plate transmission to be the light beam of λ 2 and to be the light beam of λ 4 from the wavelength that 45 degree of filter plates reflect.
Be used in the light emitting devices of multi-wavelength two-forty G transmission in the present invention, the described first new light beam and the second new light beam are incident in two relative directions of polarization beam combiner.
Based on technique scheme, the light emitting devices for the transmission of multi-wavelength two-forty especially 40G/100G of the present invention compared with prior art has following technological merit:
1. tradition need by adjacent two wavelength combinations in a road light path based on the scheme of filter plate.Because adjacent two wavelength spacing are very little, therefore the diaphragm manufacture difficulty of 45 degree is high.First the present invention utilizes traditional optically filtering sheet to be combined respectively by wavelength 1 and 3 and 2 and 4.Then use a polarization beam combiner (PBC) that these two groups of sets of beams are synthesized a branch of being coupled in same optical fiber.Because wavelength spacing increases one times, the requirement of this programme to 45 degree of blooming pieces significantly reduces.
2. in the design of traditional tandem type, the light of different wave length has diverse light path, and it is very difficult for therefore realizing laser to the coupling of optical fiber with einzel lens.And signal-lens light beam is dispersed, it is impossible that the two-way diverging light very little to wavelength spacing realizes closing bundle with 45 degree of filter plates.The present invention is owing to dividing folding bundle by the light of 4 wavelength, and therefore the light path of the light of each wavelength is almost identical, can realize the coupling of laser to optical fiber completely with einzel lens.
3. the light emitting devices of the present invention degree of freedom that utilizes wavelength and polarization to divide folding bundle can improve the placement of four lasers and flexibility, to realize the low cost small-sized encapsulated of optics.
Accompanying drawing explanation
Fig. 1 is the version schematic diagram of a kind of light emitting devices in prior art.
Fig. 2 is the version schematic diagram of another kind of light emitting devices in prior art.
Fig. 3 is the version schematic diagram of the present invention for embodiment 1 in the light emitting devices of multi-wavelength high rate data transmission.
Fig. 4 is the version schematic diagram of the present invention for embodiment 2 in the light emitting devices of multi-wavelength high rate data transmission.
Fig. 5 is the version schematic diagram of the present invention for embodiment 3 in the light emitting devices of multi-wavelength high rate data transmission.
Embodiment
We to do for the light emitting devices that multi-wavelength two-forty especially 40G/100G is transmitted the present invention with specific embodiment by reference to the accompanying drawings and further elaborate below; understand its structure type and operation principle in the hope of more cheer and bright, but can not limit the scope of the invention with this.
Core design thought of the present invention is that the lower rate transmissions signal set of multiple different wave length forms a multi-wavelength two-forty signal together and transmits.Multiple laser is specifically utilized to produce the laser signal of different wave length, then first the laser signal of different wave length is synthesized new light beam by filter set, and then utilized by new light beam polarization beam combiner to be combined in a larger light beam coupling to same optical fiber to carry out signal propagation.In reality, 40G/100G signal is most widely used, and we elaborate the designing and making of the light emitting devices of multi-wavelength high rate data transmission of the present invention as example.
Based on foregoing invention thought, the signal of the 10G/25G of 4 different wave lengths is integrated together to form 40G/100G signal and comes for information transmission by us.Light emitting devices for 40G/100G transmission structurally mainly includes laser, 45 degree of filter plates and polarization beam combiner.Wherein, the light beam of 4 kinds of different wave lengths that four lasers send respectively, its wavelength is respectively λ 1, λ 2, λ 3 and λ 4, and λ 1 < λ 2 < λ 3 < λ 4.Be first that two light beams of λ 1 and λ 3 are combined into the first new light beam through 45 degree of filter plates by wavelength in the solution of the present invention, wavelength is that two light beams of λ 2 and λ 4 are combined into the second new light beam through 45 degree of filter plates, and then the first new light beam and the second new light beam are combined together to form a new light beam comprising four different wave lengths, finally again by this light beam coupling to same optical fiber through a polarization beam combiner.
Certainly, we utilize the object of 45 degree of filter plates to be to be convenient to the laser of two different wave lengths to place in 90 degree of states, are convenient to our structural design and element manufacturing.In like manner, based on thought of the present invention, other angle filter plate can also be utilized to realize same function, as long as the incidence angle of two incident beams is equal.
In order to the set of signals synthesis 40G/100G signal realizing the 10G/25G of above-mentioned 4 different wave lengths comes for information transmission, structural design of the present invention is stated out by following technical em-bodiments.
Embodiment 1
As shown in Figure 3, the light beam of 4 kinds of different wave lengths that four lasers send respectively, its wavelength is respectively λ 1, λ 2, λ 3 and λ 4, and λ 1 < λ 2 < λ 3 < λ 4.In the solution of the present invention, wavelength is first that two light beams of λ 1 and λ 3 are combined into the first new light beam λ 1 through the one 45 degree of filter plate 1 by needs, 3, wavelength is that two light beams of λ 2 and λ 4 are combined into the second new light beam λ 2 through the 2 45 degree of filter plate 2, 4, second new light beam λ 2 in the present embodiment, the polarization direction comparatively first new light beam λ 1 of 4, the polarization direction 90-degree rotation of 3, and then by the first new light beam λ 1, 3 and the second new light beam λ 2, 4 are combined together to form a new light beam λ 1 through a polarization beam combiner 3, 2, 3, 4, last again by this light beam coupling to same optical fiber.
In the present embodiment, the first new light beam λ 1,3 includes from the wavelength of the one 45 degree of filter plate 1 transmission to be the light beam of λ 1 and to be the light beam of λ 3 from the wavelength that the one 45 degree of filter plate 1 reflects.Certainly based on different 45 degree of filter plate designs, two light beams of wavelength X 1 and wavelength X 3 can exchange, and namely new light beam λ 1,3 also can be the light beam of λ 3 by the wavelength from the one 45 degree of filter plate 1 transmission and form from the light beam that the one 45 degree of wavelength that filter plate 1 reflects is λ 1.Second new light beam λ 2,4 includes from the wavelength of the 2 45 degree of filter plate 2 transmission to be the light beam of λ 2 and to be the light beam of λ 4 from the wavelength that the 2 45 degree of filter plate 2 reflects.The same second new light beam λ 2,4 also can by being the light beam of λ 4 by the wavelength from the 2 45 degree of filter plate 2 transmission and forming from the light beam that the 2 45 degree of wavelength that filter plate 2 reflects is λ 2.Further, the new light beam λ 2,4 of the first new light beam λ 1,3 and second is incident in two vertical direction of polarization beam combiner 3.
Due to the polarization direction 90-degree rotation of polarization direction new light beam compared with first of the second new light beam, two light beams like this with 90 degree of cross-polarizations will combine to be coupled in same optical fiber through a polarization beam combiner (PBC).In addition, the output only single polarised light of general edge-emission semiconductor laser, reach the light beam polarization direction relative wavelength λ 2 of wavelength X 1 and λ 3 and the light beam polarization 90-degree rotation of λ 4, only the semiconductor laser chip 90-degree rotation of wavelength X 2 and λ 4 need be placed.
Embodiment 2
The structure of the present embodiment is similar to embodiment 1, and difference is to be provided with a half-wave plate 4 in the light path of the first new light beam λ 1,3, as shown in Figure 4.Half-wave plate will by polarization direction 90-degree rotation.Mainly because if device chips 90-degree rotation not easily realizes, simple scheme is placement half-wave plate wherein in a light path, and such half-wave plate will by polarization direction 90-degree rotation.
Embodiment 3
As shown in Figure 5, the light beam of 4 kinds of different wave lengths that four lasers send respectively, its wavelength is respectively λ 1, λ 2, λ 3 and λ 4, and λ 1 < λ 2 < λ 3 < λ 4.Be first that two light beams of λ 1 and λ 3 are combined into the first new light beam λ 1,3 through the 3 45 degree of filter plate 5 by wavelength in the solution of the present invention, wavelength is that two light beams of λ 2 and λ 4 are combined into the second new light beam λ 2,4 through the 4 45 degree of filter plate 6.In the present embodiment, the polarization direction of the second new light beam λ 2,4 is identical with the polarization direction of the first new light beam λ 1,3, first new light beam λ 1,3 and the second new light beam λ 2,4 are incident to two opposite faces of polarization beam combiner 7 with identical polarization direction, be placed with a completely reflecting mirror 8 and a quarter wave plate 9 at polarization beam combiner 7 on the reflection direction of the new light beam λ 2,4 of the first new light beam λ 1,3 or second, the new light beam of two bundles after reflection combines to be coupled in same optical fiber.
In the present embodiment, the first new light beam includes from the wavelength of the 3 45 degree of filter plate transmission to be the light beam of λ 1 and to be the light beam of λ 3 from the wavelength of the 3 45 degree of filter plate reflection.Second new light beam includes from the wavelength of the 4 45 degree of filter plate transmission to be the light beam of λ 2 and to be the light beam of λ 4 from the wavelength of the 4 45 degree of filter plate reflection.Further, the first new light beam and the second new light beam are incident on the direction that two of polarization beam combiner relative.
Wavelength X 1 and λ 3 and λ 2 and λ 4 are first combined in two different light paths by light emitting devices of the present invention.Because the light beam of different wave length jumps according to wavelength and combines, wavelength spacing increases one times, and the requirement of this programme to 45 degree of blooming pieces significantly reduces.
For existing LR4 40G TOSA, its four CWDM wavelength used are respectively 1270nm, 1290nm, 1310nm and 1330nm.First 1270nm and 1310nm and 1290nm and 1330nm two groups of wavelength combine by this programme, so often organize wavelength spacing 40nm, instead of the 20nm of traditional scheme, the light of final adjacent wavelength will be combined into a road light beam by polarization beam combiner and be coupled in same optical fiber.This mentality of designing will greatly simplify the making of 45 degree of diaphragms.
The present invention is owing to dividing folding bundle by the light of 4 wavelength, and the light path of the light of each wavelength is almost identical, can realize the coupling of laser to optical fiber completely with einzel lens.In addition, point folding bundle can improve the degree of freedom and the flexibility of the placement of four lasers, to realize miniaturized encapsulation.
Claims (4)
1. the light emitting devices for multi-wavelength high rate data transmission, this light emitting devices includes multiple laser, at least one filter plate and polarization beam combiner, multiple laser sends the laser beam of different wave length respectively, the laser beam of different wave length forms at least two new light beams by filter plate, new light beam combines to be coupled in same optical fiber by polarization beam combiner, it is characterized in that, this light emitting devices includes four lasers, two 45 degree of filter plates and a polarization beam combiner, 4 kinds of different wave length λ 1 that four lasers send, λ 2, the light beam of λ 3 and λ 4, wherein, λ 1 < λ 2 < λ 3 < λ 4, wavelength is that two light beams of λ 1 and λ 3 are combined into the first new light beam through 45 degree of filter plates, described first new light beam includes from the wavelength of the one 45 degree of filter plate transmission to be the light beam of λ 1 and to be the light beam of λ 3 from the wavelength of the one 45 degree of filter plate reflection, wavelength is that two light beams of λ 2 and λ 4 are combined into the second new light beam through 45 degree of filter plates, described second new light beam includes from the wavelength of the 2 45 degree of filter plate transmission to be the light beam of λ 2 and to be the light beam of λ 4 from the wavelength of the 2 45 degree of filter plate reflection, the polarization direction 90-degree rotation of polarization direction new light beam compared with first of the described second new light beam, first new light beam and the second new light beam combine to be coupled in same optical fiber through described polarization beam combiner.
2. a kind of light emitting devices for multi-wavelength high rate data transmission according to claim 1, is characterized in that, the described first new light beam and the second new light beam are incident in two vertical direction of polarization beam combiner.
3. a kind of light emitting devices for multi-wavelength high rate data transmission according to claim 1, is characterized in that, the light path of the described first new light beam is provided with a half-wave plate.
4. the light emitting devices for multi-wavelength high rate data transmission, this light emitting devices includes multiple laser, at least one filter plate and polarization beam combiner, multiple laser sends the laser beam of different wave length respectively, the laser beam of different wave length forms at least two new light beams by filter plate, new light beam combines to be coupled in same optical fiber by polarization beam combiner, it is characterized in that, this light emitting devices includes laser, 45 degree of filter plates and polarization beam combiner, 4 kinds of different wave length λ 1 that four lasers send, λ 2, the light beam of λ 3 and λ 4, wherein, λ 1 < λ 2 < λ 3 < λ 4, wavelength is that two light beams of λ 1 and λ 3 are combined into the first new light beam through 45 degree of filter plates, described first new light beam includes from the wavelength of the one 45 degree of filter plate transmission to be the light beam of λ 1 and to be the light beam of λ 3 from the wavelength of the one 45 degree of filter plate reflection, wavelength is that two light beams of λ 2 and λ 4 are combined into the second new light beam through 45 degree of filter plates, described second new light beam includes from the wavelength of the 2 45 degree of filter plate transmission to be the light beam of λ 2 and to be the light beam of λ 4 from the wavelength of the 2 45 degree of filter plate reflection, the polarization direction of the described second new light beam is identical with the polarization direction of the first new light beam, first new light beam and the second new light beam are incident to two opposite faces of polarization beam combiner with identical polarization direction, the reflection direction of polarization beam combiner to the first new light beam or the second new light beam is placed with a completely reflecting mirror and a quarter wave plate, the reflection new light beam in Hou mono-tunnel and the new light beam in another road combine to be coupled in same optical fiber.
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Families Citing this family (6)
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| CN103792541A (en) * | 2014-01-16 | 2014-05-14 | 中国科学院合肥物质科学研究院 | Difference absorb laser radar device based on tunable light source |
| CN103792673A (en) * | 2014-01-16 | 2014-05-14 | 中国科学院合肥物质科学研究院 | Polarization beam synthesizing device for multi-wavelength laser beams |
| CN108604932B (en) * | 2016-01-28 | 2020-08-07 | 华为技术有限公司 | Light emitting device with tunable wavelength |
| CN105954835B (en) * | 2016-07-15 | 2019-03-01 | 成都聚芯光科通信设备有限责任公司 | A kind of optical module of intensive multi-wavelength multiplex |
| CN108535811A (en) * | 2018-03-21 | 2018-09-14 | 武汉电信器件有限公司 | A kind of the transmitting optical device and method of polarized composite wave multiplexing |
| CN109698723A (en) * | 2018-12-29 | 2019-04-30 | 武汉大学 | A kind of fully integrated photoreceiver of silica-based high speed for chip chamber light network |
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