CN103268003B - Photoelectronic device based on wavelength division multiplexing - Google Patents

Photoelectronic device based on wavelength division multiplexing Download PDF

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Publication number
CN103268003B
CN103268003B CN201310196552.XA CN201310196552A CN103268003B CN 103268003 B CN103268003 B CN 103268003B CN 201310196552 A CN201310196552 A CN 201310196552A CN 103268003 B CN103268003 B CN 103268003B
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optical filter
optical
fiber
detector
wdm optical
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CN103268003A (en
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宋琛
邹翔
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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Abstract

The invention discloses a pohotoelectronic device based on wavelength division multiplexing. The pohotoelectronic device based on the wavelength division multiplexing comprises a detector, a curve-face reflecting device, a WDM optical filter, a dual-tail fiber device and a WDM optical filter tube body, wherein the WDM optical filter is installed on a support inside the WDM optical filter tube body in a built-in mode, and the curve-face reflecting device is fixedly arranged on the upper portion of the WDM optical filter tube body through insulating materials and above the built-in WDM optical filter. In the direction of the optical axis of the detector, the detector is fixedly arranged on one side of the WDM optical filter tube body through insulating materials, and the dual-tail optical device is fixedly arranged on the other side of the WDM optical filter tube body. Through the application of the pohotoelectronic device based on the wavelength division multiplexing, needed time for adjustment can be reduced, and adjusting efficiency and receiving effects can be improved.

Description

Based on the electrooptical device of wavelength-division multiplex
Technical field
The present invention relates to optical communication field, particularly relate to a kind of electrooptical device based on wavelength-division multiplex.
Background technology
In recent years, the broadband network such as intelligent acess (FTTx, Fiber-to-the-x) based on optical fiber communication can provide voice at a high speed, data and Video service for user, is developed rapidly.In existing broadband network, still do not support CATV (cable television) (CATV, Community Antenna Television) business.Thus, in order to expand the application function of broadband network, needing to upgrade to existing broadband network, to make it support CATV business, should as far as possible few legacy network be changed simultaneously.
Existing conventional upgrading mode is the local side at optical-fiber network, such as, optical line terminal (the OLT of optical-fiber network end, Optical Line Terminal) carry out the broadcast of CATV signal, and at user side optical network unit (ONU, Optical Network Unit) electrooptical device in, the photoelectric component receiving CATV signal is set.
Fig. 1 is the existing electrooptical device structural representation based on wavelength-division multiplex.See Fig. 1, this electrooptical device comprises: detector 1, shell 2, wavelength division multiplexer (WDM, Wavelength DivisionMultiplexing) optical filter 3, collimating apparatus 4 and double tail fiber device 5, wherein, shell 2 is built-in with a part for WDM optical filter 3, collimating apparatus 4 and double tail fiber device 5, the external diameter of shell 2 and detector 1 adjoining dimensions, WDM optical filter 3 needs to be adjusted to special angle, to reach object specific band light signal (CATV signal and non-CATV signal) being reflexed to another tail optical fiber end from the tail optical fiber end of double tail fiber device 5.
Light signal in double tail fiber device 5 first receives and dispatches port 6(first tail optical fiber) receive the uplink optical signal that outside ONU sends, uplink optical signal is non-CATV signal, export collimating apparatus 4 to, after carrying out collimation process by collimating apparatus 4, obtain up collimation (parallel) light, up collimated light exports WDM optical filter 3 to, the up collimated light reflection that WDM optical filter 3 will receive, export collimating apparatus 4 to, after collimating apparatus 4 carries out collimating (convergence) process again, the light signal second exported in double tail fiber device 5 receives and dispatches port 7(second tail optical fiber), and receive and dispatch port 7 by the light signal in double tail fiber device 5 second and export optical-fiber network end to, finally be transferred to the OLT of optical network local side.
The downlink optical signal of optical-fiber network end transmission, comprise CATV signal and non-CATV signal, the light signal second exported in double tail fiber device 5 receives and dispatches port 7, light signal in double tail fiber device 5 second is received and dispatched port 7 and is received the downlink optical signal that outside OLT sends, export collimating apparatus 4 to, after carrying out collimation process by collimating apparatus 4, obtain descending collimated light, descending collimated light exports WDM optical filter 3 to.Wherein,
For non-CATV signal, the collimated light reflection that WDM optical filter 3 will receive, exports collimating apparatus 4 to, after again carrying out collimation process, the light signal first exported in double tail fiber device 5 receives and dispatches port 6, and receives and dispatches port 6 by the light signal in double tail fiber device 5 first and export user side ONU to.
For CATV signal, the collimated light of reception is carried out transmission by WDM optical filter 3, exports detector 1 to, and detector 1 receives the CATV light signal through WDM optical filter 3 transmission, changes electric signal into, export user side to from pin after process.
WDM optical filter 3 pairs of CATV signals carry out transmission, reflect non-CATV signal or are totally reflected, and according to the wavelength feature of CATV signal and non-CATV signal, can arrange different anti-reflection films and realize.In practical application, can WDM optical filter 3 be initially installed in shell 2, then, by the setting angle of fine setting WDM optical filter 3, thus realize carrying out transmission to CATV signal, non-CATV signal is reflected or is totally reflected, makes the light signal through collimating apparatus 4 convergence processing can converge at corresponding tail optical fiber in double tail fiber device 5.
From above-mentioned, the existing electrooptical device based on wavelength-division multiplex, shell size is by assembling restriction, external diameter is suitable with detector, and consider the requirement of mechanical strength of electrooptical device, the tube wall of shell can not be too thin, therefore, shell internal diameter size is very limited, making space limited in shell, by regulating setting angle and the position of WDM optical filter, regulating limited allowance, angular adjustment is very difficult, and adjustment required time is longer, adjustment efficiency is low.
In addition, because whole light path have employed collimated light scheme, cause there has been additional requirement to detector, require that the photoelectric chip of receiving optical signals in detector must be positioned on the focal plane of finder lens cap, otherwise just cannot realize best reception.
Summary of the invention
Embodiments of the invention provide a kind of electrooptical device based on wavelength-division multiplex, reduce and regulate required time, raising adjustment efficiency and reception.
For achieving the above object, a kind of electrooptical device based on wavelength-division multiplex that the embodiment of the present invention provides, this electrooptical device comprises: detector, camber reflection device, WDM optical filter, double tail fiber device and WDM optical filter body, wherein,
WDM optical filter is built on the support in WDM optical filter body, and above built-in WDM optical filter, camber reflection device is fixed on WDM optical filter body top by insulating material; Along detector optical axis direction, detector is fixed on the side of WDM optical filter body by insulating material, and the opposite side of WDM optical filter body, is fixed with double tail fiber device.
Preferably, in the direction of the optical axis, the optical axis of described detector and the optical axis of double tail fiber device are on same straight line.
Preferably, described camber reflection device is concave mirror, concave surface facing WDM optical filter, and reflecting surface is concave surface, its focal length is the particular value through design, makes the light reflection of the end face outgoing from one of double tail fiber device two core end surface enter another core end surface.
Preferably, described camber reflection device is convex reflecting mirror, convex surface is not towards WDM optical filter, the back side of convex surface is towards WDM optical filter, convex surface is reflecting surface, its focal length is the particular value through design, makes the light reflection of the end face outgoing from one of double tail fiber device two core end surface enter another core end surface.
Preferably, described WDM optical filter coating is facing to camber reflection device, and non-coated surface is towards detector, and the angular range between non-coated surface and detector optical axis is 38 ° ~ 52 °.
Preferably, the angular range between the normal of described camber reflection device and optical axis is 83 ° ~ 97 °.
Preferably, described detector is indium gallium arsenic fast photodiode detector or avalanche photodiode detector.
Preferably, in described detector, the photosurface of receiving optical signals is positioned at outside the focal length of finder lens focal plane.
Preferably, the first tail optical fiber in double tail fiber device receives the uplink optical signal that outside optical network unit ONU sends, and transmit come from optical-fiber network, through the downlink optical signal of described electrooptical device to ONU;
The second tail optical fiber in double tail fiber device receives and comes from the downlink optical signal of optical-fiber network, and transmit come from optical network unit ONU, through the uplink optical signal of described electrooptical device to optical-fiber network;
Detector receives the CATV signal coming from optical-fiber network, is converted into electric signal, exports from pin.
Preferably, the first tail optical fiber in double tail fiber device receives the uplink optical signal that outside optical network unit ONU sends, export collimating apparatus to, export WDM optical filter to after carrying out collimation process by collimating apparatus, WDM optical filter reflexes to reflection device, and reflection device is reflected back WDM optical filter again, WDM optical filter reflects again, export collimating apparatus to converge, export the second tail optical fiber in double tail fiber device to, and export optical-fiber network end to by the second tail optical fiber in double tail fiber device;
The downlink optical signal of optical-fiber network end transmission, exports the second tail optical fiber in double tail fiber device to, then exports collimating apparatus to, and collimating apparatus exports WDM optical filter to after carrying out collimation process:
For non-CATV signal, WDM optical filter reflexes to reflection device, and reflection device is reflected back WDM optical filter again, WDM optical filter reflects again, export collimating apparatus to converge, export the first tail optical fiber in double tail fiber device to, and export ONU to by the first tail optical fiber in double tail fiber device;
For CATV signal, WDM optical filter carries out transmission, exports detector to, and detector receives the CATV light signal through WDM filter transmission, changes electric signal into, export user side to from pin after process.
As seen from the above technical solution, a kind of electrooptical device based on wavelength-division multiplex that the embodiment of the present invention provides, by WDM optical filter is set to independently element, and above WDM optical filter, reflection device is set, in order to carry out the adjustment of reflection ray, make the reflection part needing to regulate regulate space to increase, reduce the time needed for regulating; That is, the adjustment space that in this patent, accommodation reflex device has, compared to the adjustment space that the WDM optical filter of prior art has, more loosely, thus makes adjustment become comparatively easy.Meanwhile, because WDM optical filter has had larger installing space, more convenient to operate during assembling.
Meanwhile, this patent have employed non-collimated light technology, owing to not adopting collimated light scheme, makes to also reduce the requirement of detector, concrete, reduces the requirement of the photoelectric chip position to detector receiving optical signals.Photoelectric chip in detector need not be positioned on the focal plane of finder lens cap again, as long as outside the focal plane being positioned at finder lens cap, when making photoelectric device, by the distance of adjustment detector to double tail fiber device, that is, adjust object distance, detector can be made to realize best reception.
Accompanying drawing explanation
In order to be illustrated more clearly in the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.Apparently, the accompanying drawing in below describing is only some embodiments of the present invention, for those of ordinary skills, can also obtain other embodiment and accompanying drawing thereof according to these accompanying drawing illustrated embodiments.
Fig. 1 is the existing electrooptical device structural representation based on wavelength-division multiplex.
Fig. 2 is the electrooptical device structural representation of the embodiment of the present invention based on wavelength-division multiplex.
Fig. 3 is the electrooptical device sectional structure schematic diagram of the embodiment of the present invention based on wavelength-division multiplex.
Embodiment
Carry out clear, complete description below with reference to accompanying drawing to technical scheme of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope that the present invention protects.
The existing electrooptical device based on wavelength-division multiplex, because shell internal diameter size is limited, regulates setting angle and the position of WDM optical filter in shell, regulates difficulty, and required time is longer, adjustment efficiency is low.
Meanwhile, the collimated light technology that existing scheme adopts is had higher requirement to the position of photoelectric chip in detector, and when only having photoelectric chip to be positioned on the focal plane of finder lens, device just has the effect of best reception CATV signal.
Consider that the setting angle of WDM optical filter needs to carry out transmission to CATV signal, non-CATV signal is reflected, make to regulate comparatively difficulty, in the embodiment of the present invention, consider WDM optical filter to be set to independently element, be not built in shell by WDM optical filter, and above WDM optical filter, reflection device is set, in order to carry out the adjustment of reflection ray, make the reflection part needing to regulate regulate space to increase, reduce the time needed for regulating; That is, the adjustment space that in this patent, accommodation reflex device has, compared to the adjustment space that the WDM optical filter of prior art has, more loosely, thus makes adjustment become comparatively easy.Meanwhile, because WDM optical filter has had larger installing space, more convenient to operate during assembling.
Meanwhile, this patent have employed non-collimated light technology, makes to also reduce the requirement of detector.Photoelectric chip in detector need not be positioned on the focal plane of finder lens cap again, as long as outside the focal plane being positioned at finder lens cap, when making photoelectric device, by the distance of adjustment detector to double tail fiber device, detector can be made to realize best reception.
Fig. 2 is the electrooptical device structural representation of the embodiment of the present invention based on wavelength-division multiplex.See Fig. 2, this electrooptical device comprises: detector 21, camber reflection device 22, WDM optical filter 23, double tail fiber device 25 and WDM optical filter body 26, wherein,
WDM optical filter 23 is built on the support in WDM optical filter body 26, and above built-in WDM optical filter 23, camber reflection device 22 is fixed on WDM optical filter body 26 top by insulating material; Along optical axis (radial direction) direction of detector 21, detector 21 is fixed on the side of WDM optical filter body 26 by insulating material, the opposite side of WDM optical filter body 26, is fixed with double tail fiber device 25, and the optical axis of detector 21 and the optical axis of double tail fiber device 25 are same straight line.
Preferably, camber reflection device 22 is concave mirror, concave surface facing WDM optical filter, and reflecting surface is concave surface, its focal length is the particular value through design, and the light reflection of the end face outgoing from one of double tail fiber device two core end surface can be made to enter another core end surface.
In practical application, camber reflection device 22 also can be convex reflecting mirror, convex surface is not towards WDM optical filter, the back side of convex surface is towards WDM optical filter, convex surface is reflecting surface, its focal length is the particular value through design, makes the light reflection of the end face outgoing from one of double tail fiber device two core end surface enter another core end surface.
In the embodiment of the present invention, be provided with two fibre cores in double tail fiber device 25, by bifurcated process, in double tail fiber device 25 outside or inside, form two tail optical fibers with tail wires of fiber optics, tail optical fiber is connected with exterior light network-side (OLT) and user side (ONU) respectively.Wherein, crotch can be arranged on the end of double tail fiber device 25, and namely with the interface of outside, also can be arranged on the inside of double tail fiber device 25, namely tail optical fiber stretches in double tail fiber device 25, by bifurcated, forms two fibre cores.
In practical application, optical interface device is as the public input/output end port of electrooptical device, plug-in square (SC) plug-type or plug-in round (LC) plug-type can be adopted, or, adopt plug-in square/microballoon face grinding and polishing (SC/PC) tail fiber type, plug-in square/in oblique angle and do microballoon face grinding and polishing (SC/APC) tail fiber type or plug-in round/make microballoon face grinding and polishing (LC/APC) type in oblique angle, to be connected with the light mouth of external network, realize single fiber bi-directional transfer function.
Preferably, detector can be indium gallium arsenic fast photodiode (PIN, Positive-intrinsic-Negtive) detector, also can be avalanche photodide (APD, Avalanche Photo Diode) detector.
Preferably, in detector, the photosurface of receiving optical signals is positioned at outside the focal length of finder lens focal plane.
Preferably; WDM optical filter body is hexahedral shape; it should be noted that; WDM optical filter body adopts hexahedral shape to be exemplary; everyly can fix WDM optical filter and reflection device respectively, and the shape making reflection device be positioned at WDM optical filter upper end all falls within the scope of protection of the present invention.
In practical application, before side detector 21 being fixed on WDM optical filter body 26 by insulating material 28, can position detector 21: after WDM optical filter 23 is installed according to the angle pre-set, outside CATV signal is accessed by double tail fiber device 25, export WDM optical filter 23 to, WDM optical filter 23 pairs of CATV signals carry out transmission, export detector 21 to, by fine adjustment detector 21, the CATV light signal that detector 21 is received reaches the strongest, then, fixed detector 21.In the embodiment of the present invention; the fixed form by insulating material detector 21 being fixed on WDM optical filter body 26 side is exemplary; every other fixed form and immobilization material that detector 21 can be fixed on WDM optical filter body 26 side, all falls into protection scope of the present invention.
In the embodiment of the present invention, camber reflection device 22 is fixed on WDM optical filter body 26 top by insulating material 29, before fixing, can position camber reflection device 22: after WDM optical filter 23 is installed according to the angle pre-set, by the outside non-CATV signal of tail optical fiber access of in double tail fiber device 25, export WDM optical filter 23 to, WDM optical filter 23 reflects non-CATV signal, export the camber reflection device 22 on top to, after camber reflection device 22 carries out convergence processing to the non-CATV signal received, reflex to WDM optical filter 23, WDM optical filter 23 carries out secondary reflection again, the non-CATV signal reflex received is returned another root tail optical fiber in double tail fiber device 25.By setting angle and the position of fine setting camber reflection device 22, the non-CATV light signal being reflected back another root tail optical fiber in double tail fiber device 25 is made to reach the strongest, then, fixing camber reflection device 22.In the embodiment of the present invention; the fixed form adopting insulating material camber reflection device 22 to be fixed on WDM optical filter body 26 top is exemplary; every fixed form and immobilization material that camber reflection device 22 can be fixed on WDM optical filter body 26 top, all falls into protection scope of the present invention.
In the embodiment of the present invention, electrooptical device both can be applied to ethernet passive optical network (EPON, Ethernet Passive Optical Network) system, also gigabit passive optical network (GPON can be applied to, Gigabit Passive Optical Network) system, optical network unit (ONU, OpticalNetwork Unit) the uplink optical signal wavelength that exports is 1310nm, the wavelength of the non-CATV light signal in the downlink optical signal that OLT exports is 1490nm, and the wavelength of the CATV signal in downlink optical signal is 1550nm.The CATV signal of WDM optical filter 23 transmission 1550nm, the reflection uplink optical signal of 1310nm and the downlink optical signal of 1490nm.
Preferably, the light signal of WDM optical filter 23 to 1260 ~ 1360nm and 1480 ~ 1500nm has good total reflection characteristic; To the CATV light signal of 1550 ~ 1560nm, there is good transmissison characteristic.
About structure and the workflow thereof of detector 21, WDM optical filter 23 and double tail fiber device 25, be prior art, omit detailed description at this.
Fig. 3 is the electrooptical device sectional structure schematic diagram of the embodiment of the present invention based on wavelength-division multiplex.See Fig. 3, this electrooptical device analysed and observe comprises: detector 21, camber reflection device 22, WDM optical filter 23 and double tail fiber device 25, wherein,
In the direction of the optical axis, detector 21 is positioned at the left side of double tail fiber device 25, the optical axis of detector 21 and the optical axis of double tail fiber device 25 are on same straight line, detector 21 is for receiving the CATV light signal come from WDM optical filter 23 transmission, and after received CATV light signal is converted into electric signal, in the pin access external circuits of detector 21;
Double tail fiber device 25 has two tail optical fibers, be respectively the first tail optical fiber and the second tail optical fiber, two tail optical fibers are on double tail fiber device 25 internal port, be respectively used to connect outside optical-fiber network end and user side, the uplink optical signal of user side output is received by the first tail optical fiber, export WDM optical filter 23 to, the uplink optical signal of reception is reflexed to camber reflection device 22 by WDM optical filter 23, camber reflection device 22 converges the uplink optical signal received and is reflected back WDM optical filter 23, WDM optical filter 23 carries out secondary reflection again and inputs the second tail optical fiber, optical-fiber network end is exported to by the second tail optical fiber, the downlink optical signal of optical-fiber network end output is received by the second tail optical fiber, export WDM optical filter 23 to, the downlink optical signal of reception is reflexed to camber reflection device 22 by WDM optical filter 23, camber reflection device 22 converges the downlink optical signal received and is reflected back WDM optical filter 23, WDM optical filter 23 carries out secondary reflection again and inputs the first tail optical fiber, exports user side to by the first tail optical fiber.
In the embodiment of the present invention, the fibre core of two tail optical fibers in double tail fiber device 25 can share a ceramic sheath, and the fibre core of the first tail optical fiber and the second tail optical fiber is all near the optical axis of detector 21.Like this, the light signal transmitted by the first tail optical fiber and the second tail optical fiber, directive WDM optical filter 23 carries out transmission or reflection; And the light signal reflected by WDM optical filter 23, through the convergence of camber reflection device 22 and reflecting again of WDM optical filter 23, converge at the second tail optical fiber or the first tail optical fiber, then export outside to by the second tail optical fiber or the first tail optical fiber.That is, the light signal that the tail optical fiber of connecting optical network end or user side sends, directive WDM optical filter 23.Wherein, if light signal is CATV light signal, detector 21 is transmitted through by WDM optical filter 23; If light signal is non-CATV light signal, reflexed to camber reflection device 22 by WDM optical filter 23, by the convergence of camber reflection device 22 and after reflecting, directive WDM optical filter 23 again, again, after being reflected by WDM optical filter 23, enter the first tail optical fiber or the second tail optical fiber, and transfer to outside.
In the embodiment of the present invention, by setting angle and the position of adjustment camber reflection device 22, the position that light signal converges in WDM optical filter 23 plane can be changed, after the reflection of WDM optical filter 23, can make on its fibre core converging in the first tail optical fiber or the second tail optical fiber.
WDM optical filter 23 is between detector 21 and double tail fiber device 25, and coated surface is towards camber reflection device 22, and non-coated surface is towards detector 21.Setting angle, the angle namely between non-coated surface and detector 21 optical axis extended line is α.Coated surface is for separating of non-CATV signal and CATV signal: after the non-CATV signal in the uplink optical signal receiving double tail fiber device 25 output or downlink optical signal, reflex to camber reflection device 22, after converging through camber reflection device 22, reflecting, again directive WDM optical filter 23, WDM optical filter 23 receives the light signal that camber reflection device 22 returns, through secondary reflection again, export double tail fiber device 25 to; After CATV signal in the downlink optical signal receiving double tail fiber device 25 output, be transmitted through detector 21;
In the embodiment of the present invention, WDM optical filter 23 has the complete transmission of CATV light signal, to the characteristic that non-CATV light signal reflects completely.
Camber reflection device 22 is positioned at the upper end of WDM optical filter 23, and the angle between the normal of camber reflection device 22 and optical axis is β.Camber reflection device for collecting and reflecting the non-CATV signal exported by WDM optical filter 23, and reflexes to WDM optical filter 23.
Preferably, camber reflection device 22 is concave mirror, concave surface facing WDM optical filter, and reflecting surface is concave surface, and its focal length is the particular value through design, makes the light reflection of the end face outgoing from one of double tail fiber device two core end surface enter another core end surface.Or, camber reflection device 22 is convex reflecting mirror, convex surface is not towards WDM optical filter, the back side of convex surface is towards WDM optical filter, convex surface is reflecting surface, its focal length is the particular value through design, makes the light reflection of the end face outgoing from one of double tail fiber device two core end surface enter another core end surface.
Preferably, the span of α is 38 ° ~ 52 °, and the span of β is 83 ° ~ 97 °.
Below the workflow of the embodiment of the present invention based on the electrooptical device of wavelength-division multiplex is described in detail.
The first tail optical fiber in double tail fiber device 25 receives the uplink optical signal that outside ONU sends, uplink optical signal is non-CATV signal, export WDM optical filter 23 to, WDM optical filter 23 by receive non-CATV signal reflex to camber reflection device 22, camber reflection device 22 carries out convergence processing to the non-CATV signal received, be reflected back WDM optical filter 23 again, WDM optical filter 23 reflects again to the non-CATV signal received, export the second tail optical fiber in double tail fiber device 25 to, and export optical-fiber network end to by the second tail optical fiber in double tail fiber device 25, final arrival optical network local side OLT.Like this, the non-CATV signal that can realize receiving in the first tail optical fiber exports WDM optical filter 23 to by point mode, by the convergence of camber reflection device 22, the reflecting again of reflection and WDM optical filter 23, then inputs to the second tail optical fiber with point mode.
The downlink optical signal of optical-fiber network end (coming from optical network local side OLT transmission) transmission, comprise CATV signal and non-CATV signal, export the second tail optical fiber in double tail fiber device 25 to, the second tail optical fiber in double tail fiber device 25 receives the downlink optical signal that outside OLT sends, and exports WDM optical filter 3 to.Wherein,
For non-CATV signal, WDM optical filter 23 by receive non-CATV signal reflex to camber reflection device 22, the non-CATV signal received is carried out convergence processing by camber reflection device 22, be reflected back WDM optical filter 23 again, WDM optical filter 23 reflects again to the non-CATV signal received, export the first tail optical fiber in double tail fiber device 25 to, and export user side ONU to by the first tail optical fiber in double tail fiber device 25.
For CATV signal, the CATV signal of reception is carried out transmission by WDM optical filter 23, exports detector 21 to, and detector 21 receives the CATV light signal through WDM optical filter 23 transmission, changes electric signal into, export user side to from pin after process.
From above-mentioned, in the embodiment of the present invention, by WDM optical filter is set to independently element, and above WDM optical filter, reflection device is set, in order to carry out the adjustment of reflection ray, make the reflection part needing to regulate regulate space to increase, reduce the time needed for regulating; That is, the adjustment space that in this patent, accommodation reflex device has, compared to the adjustment space that the WDM optical filter of prior art has, more loosely, thus makes adjustment become comparatively easy.Meanwhile, because WDM optical filter has had larger installing space, more convenient to operate during assembling.
Meanwhile, this patent have employed non-collimated light technology, owing to not adopting collimated light scheme, makes to also reduce the requirement of detector, concrete, reduces the requirement of the photoelectric chip position to detector receiving optical signals.Photoelectric chip in detector need not be positioned on the focal plane of finder lens cap again, as long as outside the focal plane being positioned at finder lens cap, when making photoelectric device, by the distance of adjustment detector to double tail fiber device, that is, adjust object distance, detector can be made to realize best reception.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technologies thereof to these amendments of the present invention and modification, then the present invention also comprises these change and modification.

Claims (8)

1. based on an electrooptical device for wave division multiplexing WDM, it is characterized in that, this electrooptical device comprises: detector, camber reflection device, WDM optical filter, double tail fiber device and WDM optical filter body, wherein,
WDM optical filter is built on the support in WDM optical filter body, and above built-in WDM optical filter, camber reflection device is fixed on WDM optical filter body top by insulating material; Along detector optical axis direction, detector is fixed on the side of WDM optical filter body by insulating material, and the opposite side of WDM optical filter body, is fixed with double tail fiber device;
In the direction of the optical axis, the optical axis of described detector and the optical axis of double tail fiber device are on same straight line.
2. electrooptical device according to claim 1, it is characterized in that, described camber reflection device is concave mirror, concave surface facing WDM optical filter, reflecting surface is concave surface, its focal length is the particular value through design, makes the light reflection of the end face outgoing from one of double tail fiber device two core end surface enter another core end surface.
3. electrooptical device according to claim 1, it is characterized in that, described camber reflection device is convex reflecting mirror, convex surface is not towards WDM optical filter, the back side of convex surface is towards WDM optical filter, convex surface is reflecting surface, and its focal length is the particular value through design, makes the light reflection of the end face outgoing from one of double tail fiber device two core end surface enter another core end surface.
4. the electrooptical device according to Claims 2 or 3, is characterized in that, described WDM optical filter coating is facing to camber reflection device, and non-coated surface is towards detector, and the angular range between non-coated surface and detector optical axis is 38 ° ~ 52 °.
5. electrooptical device according to claim 4, is characterized in that, the angular range between the normal of described camber reflection device and optical axis is 83 ° ~ 97 °.
6. the electrooptical device according to Claims 2 or 3, is characterized in that, described detector is indium gallium arsenic fast photodiode detector or avalanche photodiode detector.
7. electrooptical device according to claim 6, is characterized in that, in described detector, the photosurface of receiving optical signals is positioned at outside the focal length of finder lens focal plane.
8. electrooptical device according to claim 4, is characterized in that,
The first tail optical fiber in double tail fiber device receives the uplink optical signal that outside optical network unit ONU sends, and transmit come from optical-fiber network, through the downlink optical signal of described electrooptical device to ONU;
The second tail optical fiber in double tail fiber device receives and comes from the downlink optical signal of optical-fiber network, and transmit come from optical network unit ONU, through the uplink optical signal of described electrooptical device to optical-fiber network;
Detector receives the CATV signal coming from optical-fiber network, is converted into electric signal, exports from pin.
CN201310196552.XA 2013-05-24 2013-05-24 Photoelectronic device based on wavelength division multiplexing Active CN103268003B (en)

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CN201310196552.XA CN103268003B (en) 2013-05-24 2013-05-24 Photoelectronic device based on wavelength division multiplexing

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Application Number Priority Date Filing Date Title
CN201310196552.XA CN103268003B (en) 2013-05-24 2013-05-24 Photoelectronic device based on wavelength division multiplexing
CN201510090510.7A CN104678516B (en) 2013-05-24 2013-05-24 Photoelectric device on basis of WDM (wavelength division multiplexing)

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