CN104391360A - Photoelectric detector and optical device - Google Patents
Photoelectric detector and optical device Download PDFInfo
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- CN104391360A CN104391360A CN201410635937.6A CN201410635937A CN104391360A CN 104391360 A CN104391360 A CN 104391360A CN 201410635937 A CN201410635937 A CN 201410635937A CN 104391360 A CN104391360 A CN 104391360A
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- wavelength
- division multiplex
- multiplex element
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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
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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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
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- Optics & Photonics (AREA)
- Optical Communication System (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention provides a photoelectric detector and an optical device, relates to the technical field of optical communication, and aims to solve the problem that a plurality of photoelectric detectors are required to be arranged when a plurality of optical signals of different wavelengths are used as communication wavelengths. The photoelectric detector comprises a second wavelength division multiplexing element and an electro-thermal conversion device, wherein the second wavelength division multiplexing element and the electro-thermal conversion device are both positioned in the photoelectric detector; the electro-thermal conversion device is used for receiving an external electric signal and producing heat; the second wavelength division multiplexing element is used for transmitting the optical signal within a pass band range of the second wavelength division multiplexing element and is used for absorbing heat produced by the electro-thermal conversion device to change the temperature of the electro-thermal conversion device; the pass band range of the second wavelength division multiplexing element changes with temperature; the optical device comprises the photoelectric detector. The photoelectric detector and the optical device can be used in an optical communication network.
Description
Technical field
The present invention relates to technical field of photo communication, particularly relate to a kind of photodetector and optical device.
Background technology
Along with the progress of society and the sharp increase of quantity of information, the demand of people to the rate of information throughput is also more and more higher.Therefore, it is possible to the 10G EPON (Passive Optical Network, be called for short PON) meeting people more high bandwidth requirements and rate requirement arises at the historic moment.
In the optical device used in existing 10G PON, photodetector can only select the light signal of some fixed wave length as communication wavelengths.But along with the widespread use of dense wavelength division multiplexing (DenseWavelength Division Mu ltiplexing is called for short DWMD) technology, it is even more that the wavelength in optical communication network has reached dozens of.Therefore, need to improve the light wave quantity that optical device can be used as communication wavelengths.In order to address this problem, in prior art, by configuring the photodetector of multiple variety classes and quantity in optical device, increase the quantity that optical device can receive wavelength.
Example, supposing that certain photodetector is selected wavelength is that the light signal of 1550nm is as communication wavelengths, so, this photodetector just can only utilize light signal that wavelength is 1550nm as communication wavelengths, and the light signal of other wavelength can not be utilized as communication wavelengths.Be that the light signal of 1550nm is as communication wavelengths using wavelength if both needed, be that the light signal of 1551nm and 1552nm is as communication wavelengths using wavelength again, then need to increase by two photodetectors in optical device, being respectively used to receive wavelength is the light signal of 1551nm and 1552nm.Therefore, if to need the light signal of multiple different wave length in prior art, as communication wavelengths, to need to arrange multiple photodetector.
Summary of the invention
Embodiments of the invention provide a kind of photodetector and optical device, in order to solve in prior art using the light signal of multiple different wave length as communication wavelengths time, need the problem that multiple photodetector is set.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, The embodiment provides a kind of photodetector, comprising: the second wavelength-division multiplex element and electric conversion device, and described second wavelength-division multiplex element and described electric conversion device are all positioned at described photodetector; Wherein, described electric conversion device is for receiving applied electronic signal and producing heat, described second wavelength-division multiplex element is used for the light signal in its free transmission range of transmission, described second wavelength-division multiplex element is also for absorbing the heat of described electric conversion device generation to change the temperature of self, and the free transmission range of described second wavelength-division multiplex element varies with temperature.
Second aspect, embodiments provide a kind of optical device, comprise: the photodetector described in first aspect, described photodetector, for receiving by the light signal of the downstream band of Optical Fiber Transmission, is disposed with the first lens and the first wavelength-division multiplex element at the light signal of described downstream band from described optical fiber to the light path of described photodetector; Described first lens are used for changing the light signal of described downstream band into parallel optical signal, and the parallel optical signal that described first wavelength-division multiplex element is used for can distinguishing photodetector described in described parallel optical signal reception carries out transmission.
The embodiment provides a kind of photodetector and optical device, comprising: electric conversion device and the second wavelength-division multiplex element, electric conversion device and the second wavelength-division multiplex element are all positioned at photodetector; Wherein, electric conversion device is for receiving applied electronic signal and producing heat; Second wavelength-division multiplex element is used for the light signal in its free transmission range of transmission, and the second wavelength-division multiplex element is also for absorbing the heat of described electric conversion device generation to change the temperature of self, and the free transmission range of the second wavelength-division multiplex element varies with temperature.Concrete, when the second wavelength-division multiplex element is in a certain temperature, light signal can produce corresponding optical path difference when inciding in this second wavelength-division multiplex element, and at such a temperature, the light signal that the second wavelength-division multiplex element only allows can to produce during incidence this optical path difference through.When the electric signal applied to electric conversion device is different, its temperature can change, second wavelength-division multiplex element absorbs heat that electric conversion device produces and changes self temperature, and then change the free transmission range of self, also the optical path difference that namely light signal produces in the second wavelength-division multiplex element also changes thereupon, according to the difference of optical path difference, second wavelength-division multiplex element the wavelength of transmissible light signal also just different, therefore, at different temperature, photodetector just can receive the light signal of different wave length.Compared with photodetector of the prior art, the photodetector that the embodiment of the present invention provides can under the prerequisite of the kind and quantity that do not increase photodetector, realize the reception of the light signal of multiple different wave length, thus the optical device of this photodetector is adopted, can solve in prior art using the light signal of multiple different wave length as communication wavelengths time, need the problem that multiple photodetector is set.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of a kind of photodetector that Fig. 1 provides for the embodiment of the present invention;
The structural representation of a kind of optical device that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the another kind of optical device that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the light path principle figure of the up wave band optical signal for the optical device shown in Fig. 3;
Fig. 5 is the schematic diagram that when non-parallel light incides in optical fiber in prior art, aberration produces;
Fig. 6 is the light path principle figure of the downstream band light signal for the optical device shown in Fig. 3;
Fig. 7 is the external structure schematic diagram for the optical device shown in Fig. 3;
The implementation method schematic diagram of the directional light light path that Fig. 8 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of photodetector, as shown in Figure 1, this photodetector 1 comprises: the second wavelength-division multiplex element 2 and electric conversion device 3, second wavelength-division multiplex element 2 and electric conversion device 3 are all positioned at photodetector 1.Electric conversion device 3 is for receiving applied electronic signal and producing heat; Second wavelength-division multiplex element 2 is for the light signal in its free transmission range of transmission, and the second wavelength-division multiplex element 2 is also for receiving the heat of electric conversion device 3 generation to change the temperature of self, and the free transmission range of the second wavelength-division multiplex element 2 varies with temperature.
It should be noted that, the shape of the present invention to electric conversion device and the second wavelength-division multiplex element does not limit, example, is bar shaped in Fig. 1 with electric conversion device, second wavelength-division multiplex element is rectangle is example, and the size of the second wavelength-division multiplex element is larger than electric conversion device.The heat produced to enable electric conversion device better conducts to the second wavelength-division multiplex element, as in figure 1 electric conversion device can be close to the side of the second wavelength-division multiplex element upper surface, like this, and would not the transmission of shading light signal.Example again, also electric conversion device can be set to annular, be close in the larger one side of the second wavelength-division multiplex element area again, like this, its heat produced can not only conduct to the second wavelength-division multiplex element uniformly, again can not the transmission of shading light signal, the particular location of the present invention to electric conversion device does not limit.Preferably, more even in order to make the second wavelength-division multiplex element be heated, also can the material being easy to heat conduction be set in the middle of the second wavelength-division multiplex element and electric conversion device.
Optionally, as shown in Figure 1, the second wavelength-division multiplex element 2 can be Tunable filters.Concrete, the second wavelength-division multiplex element can be that thickness or refractive index change with temperature, electric field or magnetic field and the Tunable filters of light signal through certain wavelength.
As shown in Figure 1, electric conversion device 3 can according to the temperature of the applied electronic signal change received self, when the applied electronic signal that electric conversion device 3 receives is different, its heat produced is also different, and the second wavelength-division multiplex element 2 is by receiving the heat of electrothermal transducer 3 generation to change the temperature of self.Concrete, the electric signal being applied to electric conversion device 3 can be provided by the temperature control circuit being arranged on photodetector 1 outside, changes with the change of applied electronic signal to make the temperature of electric conversion device 3.
Optionally, electric conversion device can be the device that thermistor or infrared lamp etc. can produce heat.
Below, with reference to figure 1, with electric conversion device 3 for thermistor, the Tunable filters that the second wavelength-division multiplex element 2 changes for thickness variation with temperature is example, is described in detail to the record principle of the photodetector 1 that the embodiment of the present invention provides.
Example, suppose that the light signal incided in the second wavelength-division multiplex element 2 is the light signal of 4 continuous wavelengths.Wherein, be applied to the electric signal of thermistor, Tunable filters temperature, can be one to one through the wavelength of the optical path difference of the light signal of Tunable filters and light signal, specifically can reference table 1.
Table 1
| Electric signal | Temperature | Optical path difference | Wavelength |
| u 1 | T 1 | d 1 | λ 1 |
| u 2 | T 2 | d 2 | λ 2 |
| u 3 | T 3 | d 3 | λ 3 |
| u 4 | T 4 | d 4 | λ 4 |
As can be seen from Table 1, be applied to each electric signal of thermistor, described electric signal can be magnitude of voltage or current value, the Tunable filters of all unique corresponding a certain temperature of described electric signal, and at such a temperature, Tunable filters only allow optical path difference be certain certain value light signal through.Concrete, when the temperature of Tunable filters is T
1time, only have optical path difference to be d
1light signal can be through, and optical path difference is d
1light signal again unique corresponding wavelength be λ
1light signal.So, when the temperature of Tunable filters is T
1time, only have wavelength to be λ
1light signal through Tunable filters, and then can be received by photodetector 1; In like manner, when the temperature of Tunable filters is T
2time, only have wavelength to be λ
2light signal produce optical path difference be d
2, now photodetector 1 is merely able to receive wavelength is λ
2light signal; At other temperature, principle is identical, does not repeat them here.Thus, by regulating the electric signal being applied to thermistor, changing the temperature of thermistor, changing the temperature of Tunable filters, just can realize the reception of the light signal of 4 different wave lengths.
It should be noted that, the embodiment of the present invention is 4 for the wavelength number of the light signal of the downstream band transmitted in optical interface to be described, certainly, photodetector also can receive the light signal of other numbers, and the present invention does not limit the quantity that can receive wavelength.
The photodetector that the embodiment of the present invention provides comprises electric conversion device and the second wavelength-division multiplex element, and electric conversion device and the second wavelength-division multiplex element are all positioned at photodetector; Wherein, electric conversion device is for receiving applied electronic signal and producing heat; Second wavelength-division multiplex element is used for the light signal in its free transmission range of transmission, and the second wavelength-division multiplex element is also for absorbing the heat of described electric conversion device generation to change the temperature of self, and the free transmission range of the second wavelength-division multiplex element varies with temperature.Concrete, when the second wavelength-division multiplex element is in a certain temperature, light signal can produce corresponding optical path difference when inciding in this second wavelength-division multiplex element, and at such a temperature, the light signal that the second wavelength-division multiplex element only allows can to produce during incidence this optical path difference through.When the electric signal applied to electric conversion device is different, its temperature can change, second wavelength-division multiplex element absorbs heat that electric conversion device produces and changes self temperature, and then change the free transmission range of self, also the optical path difference that namely light signal produces in the second wavelength-division multiplex element also changes thereupon, according to the difference of optical path difference, second wavelength-division multiplex element the wavelength of transmissible light signal also just different, therefore, at different temperature, photodetector just can receive the light signal of different wave length.Compared with photodetector of the prior art, the photodetector that the embodiment of the present invention provides can under the prerequisite of the kind and quantity that do not increase photodetector, realize the reception of the light signal of multiple different wave length, thus the optical device of this photodetector is adopted, can solve in prior art using the light signal of multiple different wave length as communication wavelengths time, need the problem that multiple photodetector is set.
The embodiment of the present invention additionally provides a kind of optical device, the structure of this optical device as shown in Figure 2, wherein, photodetector 1 shown in Fig. 2 is with shown in above-mentioned Fig. 1, photodetector 1 for receiving by the light signal of the downstream band of Optical Fiber Transmission, the light signal of downstream band from optical fiber to the light path of photodetector 1 (as shown by the arrows in Figure 2) be disposed with the first lens 5 and the first wavelength-division multiplex element 6; First lens 5 are for changing the light signal of downstream band into parallel optical signal, and the first wavelength-division multiplex element 6 carries out transmission for the parallel optical signal can distinguishing reception to photodetector in parallel optical signal 1.
Optionally, the first lens can select the convergent lens that can play converging action.
It should be noted that, optical fiber can make the optical signal transmission of downstream band in optical device by optical interface 4.Optical interface 4 is connected with external fiber as the public input/output end port of optical device, can realize the effect of single fiber bi-directional transmission.Wherein, this optical interface 4 can be the one in SC plug-type, SC/UPC, SC/APC, LC/UPC or LC/APC tail fiber type.
Concrete, the reception interval of above-mentioned photodetector 1 can be 25GHz, 50GHz or 100GHz, and the variable quantity of the wavelength of corresponding light signal is 0.2nm, 0.4nm or 0.8nm.The frequency shift of light signal is less, and its wavelength variations is less, more easily produces interference between adjacent channel, so preferred reception is spaced apart 100GHz in the embodiment of the present invention, accordingly, is spaced apart 0.8nm between adjacent channel.This photodetector 1 can modulate the downlink optical signal receiving m wavelength, and wherein, m is the natural number between 1-44, and the wavelength speed of each downstream band light signal that this tunable laser 3 receives all can reach 10Gbps.It should be noted that, in the embodiment of the present invention, the light signal of the downstream band that photodetector 1 can receive is the light signal of 1577nm-1622nm; For the type of photodetector 1, the APD/TIA type detector of coaxial packaging can be selected, also can select PIN/TIA type detector etc.
Preferably, as shown in Figure 3, the optical device that the embodiment of the present invention provides also comprises: the 3rd wavelength-division multiplex element 7; 3rd wavelength-division multiplex element 7 is for reflecting the light signal of downstream band.Wherein, the 3rd wavelength-division multiplex element 7 is arranged in the light path of the parallel optical signal of the downstream band of the first lens 5 outgoing, and the first wavelength-division multiplex element 6 and photodetector 1 are successively set on the light path reflection direction of the 3rd wavelength-division multiplex element 7.
It should be noted that, the first wavelength-division multiplex element 6 and the 3rd wavelength-division multiplex element 7 can be untunable optical filter.Certainly, the first wavelength-division multiplex element 6 and the 3rd wavelength-division multiplex element 7 also can be that other can realize the element of wavelength-division multiplex function.
Preferably, as shown in Figure 3, the optical device that the embodiment of the present invention provides also comprises: laser instrument 8.Laser instrument 8 is for launching the light signal of up wave band, and the 3rd wavelength-division multiplex element 7 is also for carrying out transmission to the light signal of up wave band; Laser instrument 8 is arranged in the light path transmission direction of the 3rd wavelength-division multiplex element 7.
Concrete, laser instrument 8 both can adopt laser with fixed wavelength, also can adopt tunable laser.Preferably, laser instrument 8 is tunable laser, and the light signal of the up wave band that this tunable laser is launched can be the light signal of 1528nm-1563nm.Further, the tuning interval of this tunable laser can be set to 100GHz, can the uplink optical signal of modulate emission n wavelength, and n is the natural number between 1-44.Wherein, the wavelength speed of each up wave band optical signal that this tunable laser is launched all can reach 10Gbps; When adopting tunable laser, under the prerequisite of the kind and quantity that do not increase laser with fixed wavelength, the quantity of the wavelength that optical device can be launched can be improved, reduces the cost of optical device.For the encapsulating structure of tunable laser, XMD encapsulating structure can be selected, also can select coaxial packaging structure etc.
Preferably, as shown in Figure 3, described optical device also comprises: the second lens 9.Wherein, the second lens 9 are arranged in the light path between laser instrument 8 and the 3rd wavelength-division multiplex element 7, and the second lens 9 change directional light into for the light signal of the up wave band launched by laser instrument 8.Optionally, the second lens 9 can select convergent lens.
Preferably, as shown in Figure 3, in order to improve the transmitting antijamming capability of transmitting terminal laser instrument 8, the optical device that the embodiment of the present invention provides can also comprise: isolator 10.Wherein, isolator 10 can be arranged between the second lens 9 and the first wavelength-division multiplex element 6; Or, be arranged between laser instrument 8 and the second lens 9.Isolator 10 is arranged on the transmit direction of laser instrument 8, effectively can absorbs the light signal and other undesired signals that reflect in light path, improve the transmitting terminal antijamming capability of laser instrument 8.
Below, with reference to the light path principle figure of the optical device downstream band light signal shown in the light path principle figure of the up wave band optical signal of optical device shown in figure 4 and Fig. 6, the emission process of the up wave band optical signal of this optical device and the receiving course of downstream band light signal are described in detail.
With reference to the light path principle figure of the light signal of the up wave band shown in figure 4, Fig. 4 is with the light signal of the up wave band of laser instrument 8 transmitting for converging light, and for diverging light is that example is described after these converging light directive second lens 9.Due to the converging action of the second lens 9, the optical signals diverging light of up wave band changes directional light into.Concrete, in the structure of the optical device shown in Fig. 3, the focus of laser instrument 8 overlaps with the focus of the second lens 9, like this, can ensure that the diverging light of directive second lens 9 becomes directional light.Subsequently, the light signal of up wave band is with the form of directional light through the 3rd wavelength-division multiplex element 7 also directive first lens 5, and the light signal of this up wave band, after the first lens 5, becomes converging light due to the converging action of the first lens 5, finally enters optical interface 4.
Except the situation shown in Fig. 4, also there is another kind of situation in different according to the distance between laser instrument 8 from the second lens 9.Concrete, when laser instrument 8 and the second lens 9 are when nearer, the light signal of up wave band that laser instrument 8 is launched before not dispersing with regard to directive second lens 9, now, directional light is become to make this converging light, then only the second lens 9 need be set to divergent lens, all the other are all identical with process shown in Fig. 4, do not repeat them here.
From the light path principle figure of the up wave band optical signal of the optical device shown in Fig. 4, the light signal of up wave band is incide on the 3rd wavelength-division multiplex element 7 with the form of directional light after the second lens 9, when light signal is parallel incide on the 3rd wavelength-division multiplex element 7 time, its emergent light is also directional light.So after the converging action of the second lens 9, the light signal of up wave band can converge at a bit, then enters optical interface 4.And in prior art, the light signal incided on the 3rd wavelength-division multiplex element 7 is not directional light, thus this light signal easily produces aberration through after the 3rd wavelength-division multiplex element 7, and light signal energy is disperseed, and reduces the coupling efficiency of transmitting terminal.Compared with prior art, the optical device that the embodiment of the present invention provides can improve the coupling efficiency of the light signal of up wave band.
Example, the schematic diagram that when inciding in optical fiber with reference to the non-parallel light shown in figure 5, aberration produces.Wherein, Fig. 5 incides non-parallel light on the 3rd wavelength-division multiplex element 7 for converging light for example is described, dotted line shown in Fig. 5 is the normal of optical filter, when light 1, light 2 and light 3 incide on optical filter, owing to being non-directional light, so the incident angle of light 1, light 2 and light 3 is respectively α
1, α
2and α
3and α
1≠ α
2≠ α
3.When light 1, light 2 and light 3 penetrate from optical filter, because incident angle is different, the light side-play amount of generation is also different, finally causes the light penetrated from optical filter can not converge at a bit, namely creates aberration, as shown in Figure 5.Compared to prior art, the optical device that the embodiment of the present invention provides, light signal through the up wave band of the second lens 9 is directional light, this directional light is after the second lens 9, can converge at a bit preferably, aberration can not be produced as prior art, thus can improve the coupling efficiency of transmitting terminal.
Concrete, with reference to the light path principle figure of the downstream band light signal of the optical device shown in figure 6.Optical interface 4 receives the light signal of the downstream band transmitted in optical-fiber network, and this light signal incides on the first lens 5 with the form of diverging light, and wherein, the first lens 5 can be convergent lens.Due to the converging action of the first lens 5, transfer to the light signal of the divergence form of the first lens 5 from optical interface 4, after the first lens 5, changing directional light into, this light signal incides on the 3rd wavelength-division multiplex element 7 with the form of directional light; This light signal is reflexed to the first wavelength-division multiplex element 6 by the 3rd wavelength-division multiplex element 7; First wavelength-division multiplex element 6 to the light signal transmission of certain wave band in this light signal, and isolates light signal and the noise signal of other wavelength; Light signal through the downstream band of the first wavelength-division multiplex element 6 still incides with the form of directional light in the second wavelength-division multiplex element 2 of setting in photodetector 1, then by regulating the applied electronic signal of photodetector 1, the wavelength of photodetector 1 at the light signal that can receive sometime is controlled.
The light path principle figure of the downstream band light signal of optical device is as shown in Figure 6 known, the light signal transmitted from optical interface 4 is after the first lens 5, directional light can be changed into, therefore be directional light through the light signal that the first wavelength-division multiplex element 6 incides on Tunable filters, because the incident angle of directional light is identical, so the optical path difference that the light signal of Same Wavelength produces in Tunable filters is just identical, and the corresponding unique optical path difference of the light signal of each wavelength, like this, just can ensure that synchronization only has the light signal of a wavelength can be received by photodetector 1.
If the light signal incided on Tunable filters is non-directional light, the angle then incided on Tunable filters due to the light signal of Same Wavelength is different, the optical path difference that the light signal of different angles incidence produces in Tunable filters is also variant, so, small part is only had to incide the optical path difference of the light signal generation on Tunable filters, meet through the adjustable condition writing optical filter, all the other most of light signals can not, through Tunable filters, cause photodetector 1 reception to be deteriorated.
So far, the structure of the optical device that the embodiment of the present invention provides all is described clearly, and the external structure of packaged optical device can with reference to figure 7.Concrete, as shown in Figure 7, this optical device is made up of photodetector 1, optical interface 4, laser instrument 8 and housing 12.Wherein, the material of housing 12 can be metal, and laser instrument 8 and optical interface 4 connect with housing 12 respectively by fixed cover 11, and photodetector 1 insulate and fixes on housing 12.
It should be noted that, the optical device shown in Fig. 3 and Fig. 7 is only a kind of optimal way that the embodiment of the present invention provides, and for the implementation that other are feasible, also belongs to protection scope of the present invention.Example, if by laser instrument 8, second lens 9 in Fig. 3 and the position of isolator 10 and the location swap of photodetector 1 and the first wavelength-division multiplex element 6, change the free transmission range of the 3rd wavelength-division multiplex element 7 in optical device again, it is made to reflect the light signal of the up wave band that laser instrument 8 is launched, carrying out transmission to the light signal of the downstream band of photoelectric detector, is also a kind of feasible implementation.
Further, as can be seen from the receiving course of the light signal of the photodetector 1 pair of downstream band shown in Fig. 6, whether the light signal incided on Tunable filters is directional light, is the key that can photodetector 1 receive the light signal of different wave length.And whether be directional light for the light signal inciding Tunable filters, depend primarily on the position relationship between the 3rd wavelength-division multiplex element 7, first lens 5 and optical interface 4, in the embodiment of the present invention, the mode of parallel coupling mode is adopted to position the 3rd wavelength-division multiplex element 7, first lens 5 and optical interface 4.Concrete, the implementation method schematic diagram of the directional light light path shown in composition graphs 8, parallel coupling mode is described in detail, it should be noted that, the 3rd wavelength-division multiplex element 7, first lens 5 in Fig. 8 and optical interface 4 same as shown in Figure 6, for the characteristic of each components and parts, do not repeat them here.
Step 1, optical interface 4 is placed on the focus place (the focus place be placed on the right side of the first lens 5 for optical interface 4 in Fig. 8 is described) of the first lens 5.
Step 2, the 3rd wavelength-division multiplex element 7 is placed on the left side of the first lens 5.
Step 3, the 4th wavelength-division multiplex element 13 is placed on the left side of the 3rd wavelength-division multiplex element 7, and the normal of the 4th wavelength-division multiplex element 13 and the horizon light direction of principal axis of optical interface 4 vertical.
Wherein, the 4th wavelength-division multiplex element 13 pairs visible light signal carries out transmission, reflects the light signal of up wave band.
Step 4, left side at the 4th wavelength-division multiplex element 13, place a screen 14 in vain.
Step 5, in optical interface 4, input a branch of visible light signal, the position of fine setting optical interface 4, makes the hot spot of the visible light signal be transmitted on white screen 14 minimum.
Concrete, white screen 14 can be placed on the position of on the left of the 4th wavelength-division multiplex element 13 about a meter, and the normal direction of white screen 14 is parallel with the horizon light direction of principal axis of optical interface 4; The object of placing white screen 14 is to observe the visible light signal transmitted from optical interface 4 after the first lens 5, the 3rd wavelength-division multiplex element 7 and the 4th wavelength-division multiplex element 13, being incident upon the spot size of the visible light signal on white screen 14.
Step 6, in optical interface 4, access return loss instrument, and re-enter the light signal that a branch of wavelength is λ, the position of fine setting optical interface 4, the return loss value that return loss instrument is shown is minimum.Now, just can think that downlink optical signal is directional light.
Concrete, the light signal of wavelength to be the light signal of λ the be a certain wavelength in up wave band optical signal.When the light signal that this wavelength is λ incides on the 3rd wavelength-division multiplex element 7 through the first lens 5, the 3rd wavelength-division multiplex element 7 carries out transmission to it, and the 4th wavelength-division multiplex element 13 reflects it.If the light signal incided on the 4th wavelength-division multiplex element 13 is not directional light, then the light signal after the 4th wavelength-division multiplex element 13 reflects, can not all in reflected light interface 4.Now, the return loss value of the return loss instrument be connected with optical interface 4 is just larger; If the light signal incided on the 4th wavelength-division multiplex element 13 is directional light, then the light signal after the 4th wavelength-division multiplex element 13 reflects, can be back in optical interface 4 in theory completely.Consider in real process, the reflection of light signal and transmission inevitably produce some losses, so, as long as the position of fine setting optical interface 4, make the return loss value of return loss instrument minimum, what the position setting of now optical interface 4 and the first lens 5 just can be described is best, and the light signal transmitted from optical interface 4, after the first lens 5, can change directional light into.
Similar, with reference to above-mentioned steps 1-step 6, first optical interface 4 is placed on the left side of the first lens 5, again the 3rd wavelength-division multiplex element 7, the 4th wavelength-division multiplex element 13 and Bai Ping 14 are placed on successively the right side of the first lens 5, also can realize the location to the 3rd wavelength-division multiplex element 7, first lens 5 and optical interface 4.
Embodiments provide a kind of optical device, comprise above-mentioned photodetector in this optical device, described photodetector comprises: electric conversion device and the second wavelength-division multiplex element, and electric conversion device and the second wavelength-division multiplex element are all positioned at photodetector; Wherein, electric conversion device is for receiving applied electronic signal and producing heat; Second wavelength-division multiplex element is used for the light signal in its free transmission range of transmission, and the second wavelength-division multiplex element is also for absorbing the heat of described electric conversion device generation to change the temperature of self, and the free transmission range of the second wavelength-division multiplex element varies with temperature.Concrete, when the second wavelength-division multiplex element is in a certain temperature, light signal can produce corresponding optical path difference when inciding in this second wavelength-division multiplex element, and at such a temperature, the light signal that the second wavelength-division multiplex element only allows can to produce during incidence this optical path difference through.When the electric signal applied to electric conversion device is different, its temperature can change, second wavelength-division multiplex element absorbs heat that electric conversion device produces and changes self temperature, and then change the free transmission range of self, also the optical path difference that namely light signal produces in the second wavelength-division multiplex element also changes thereupon, according to the difference of optical path difference, second wavelength-division multiplex element the wavelength of transmissible light signal also just different, therefore, at different temperature, photodetector just can receive the light signal of different wave length.Compared with photodetector of the prior art, the photodetector that the embodiment of the present invention provides can under the prerequisite of the kind and quantity that do not increase photodetector, realize the reception of the light signal of multiple different wave length, thus the optical device of this photodetector is adopted, can solve in prior art using the light signal of multiple different wave length as communication wavelengths time, need the problem that multiple photodetector is set.Further, this optical device also comprises laser instrument and the second lens, wherein the second lens can change the light signal of the up wave band of laser instrument transmitting into directional light, like this, the light signal of up wave band is after the second lens, can converge at a bit preferably, aberration can not be produced as prior art, therefore, it is possible to improve the coupling efficiency of transmitting terminal.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a photodetector, is characterized in that, comprising:
Electric conversion device, for receiving applied electronic signal and producing heat;
Second wavelength-division multiplex element, for the light signal in its free transmission range of transmission, described second wavelength-division multiplex element is also for absorbing the heat of described electric conversion device generation to change the temperature of self, and the free transmission range of described second wavelength-division multiplex element varies with temperature;
Described electric conversion device and described second wavelength-division multiplex element are all positioned at described photodetector.
2. photodetector according to claim 1, is characterized in that, described second wavelength-division multiplex element is Tunable filters.
3. photodetector according to claim 1, is characterized in that, described electric conversion device comprises thermistor or infrared lamp.
4. an optical device, it is characterized in that, comprise: the photodetector according to any one of claim 1-3, described photodetector is for receiving by the light signal of the downstream band of Optical Fiber Transmission, the light signal of described downstream band is from described optical fiber to the light path of described photodetector, be disposed with the first lens and the first wavelength-division multiplex element; Described first lens are used for, and change the light signal of described downstream band into parallel optical signal; Described first wavelength-division multiplex element is used for, and the parallel optical signal can distinguishing reception to photodetector described in described parallel optical signal carries out transmission.
5. optical device according to claim 4, is characterized in that, described optical device also comprises: the 3rd wavelength-division multiplex element; Described 3rd wavelength-division multiplex element is used for reflecting the light signal of described downstream band;
Described 3rd wavelength-division multiplex element is arranged in the light path of the parallel optical signal of the downstream band of described first lens outgoing, and described first wavelength-division multiplex element and described photodetector are successively set on the light path reflection direction of described 3rd wavelength-division multiplex element.
6. optical device according to claim 5, is characterized in that, described optical device also comprises: laser instrument, and described laser instrument is for launching the light signal of up wave band; Described 3rd wavelength-division multiplex element is also for carrying out transmission to the light signal of described up wave band; Described laser instrument is arranged in the light path transmission direction of described 3rd wavelength-division multiplex element.
7. optical device according to claim 6, is characterized in that, described optical device also comprises: the second lens;
Described second lens are arranged in the light path between described laser instrument and described 3rd wavelength-division multiplex element, and the light signal that described second lens are used for the up wave band launched by described laser instrument changes directional light into.
8. optical device according to claim 6, is characterized in that, described optical device also comprises: isolator;
Described isolator is arranged in the light path between described second lens and described 3rd wavelength-division multiplex element, or described isolator is arranged in the light path between described laser instrument and described second lens.
9. optical device according to claim 7, is characterized in that, described first lens and described second lens are convergent lens.
10. optical device according to claim 4, is characterized in that, the reception of described photodetector is spaced apart 100GHz, can receive the light signal of the downstream band of m wavelength, and m is the natural number between 1-44.
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| CN201410635937.6A CN104391360A (en) | 2014-11-12 | 2014-11-12 | Photoelectric detector and optical device |
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| CN201410635937.6A CN104391360A (en) | 2014-11-12 | 2014-11-12 | Photoelectric detector and optical device |
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