CN103257402A - Optical mixer and method for demodulating signal through optical mixer - Google Patents
Optical mixer and method for demodulating signal through optical mixer Download PDFInfo
- Publication number
- CN103257402A CN103257402A CN2013101432050A CN201310143205A CN103257402A CN 103257402 A CN103257402 A CN 103257402A CN 2013101432050 A CN2013101432050 A CN 2013101432050A CN 201310143205 A CN201310143205 A CN 201310143205A CN 103257402 A CN103257402 A CN 103257402A
- Authority
- CN
- China
- Prior art keywords
- signal
- interface
- light
- pbs
- polarization state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses an optical mixer and a method for demodulating a signal through the optical mixer. The optical mixer comprises two cubic unpolarized beam splitters (BS) and two cubic polarized beam splitters (PBS), wherein a cuboid block is formed by the two BSs and the two PBSs, the beam splitting interfaces of the two BSs are located in a first plane, the beam splitting interfaces of the two PBSs are located in a second plane, and the first plane is perpendicular to the second plane. According to the embodiment, the planar optical waveguide PLC technology is not used in the optical mixer, demodulation to the modulated signal is achieved through the two cubic unpolarized BSs and the two cubic PBSs, and the BSs and the PBSs are lower in cost, smaller in insertion loss, higher in temperature stability and based on space optics. Therefore, the cost of the optical mixer is reduced, the insertion losses of the optical mixer are reduced, and the temperature stability of the optical mixer is improved.
Description
Technical field
The present invention relates to fiber optic communication field, relate in particular to a kind of optical mixer and use the method that optical mixer carries out the signal demodulation.
Background technology
Optical fiber communication be a kind of be information carrier with the light wave, transmit the communication system of information by optical fiber.Because of characteristics such as it have that capacity is big, long transmission distance, transmission speed are fast, be used widely in field of high-speed optical communications.At present, in optical fiber communication network, the solution of 100Gpbs and light signal more at a high speed is in harmonious proportion and receives the DP-QPSK(Dual Polarization Quadrature Phase Shift Keying that generally adopts based on coherent reception, dual-polarization Quadrature Phase Shift Keying) modulation technique.The coherent optical heterodyne communicatio that this technology is applied in the optical fiber communication network receives with the solution mediation that realizes the DP-QPSK light signal.
Fig. 1 is the inner structure block diagram of coherent optical heterodyne communicatio.Structure comprises among the figure: coherent light detuner 110, PD(photodiode) receiving device array 104 and signal amplification and control circuit 105.Wherein, the coherent light detuner comprises: polarising beam splitter PBS103 and optical mixer 101 and 102; Each PD receiving device array 104 comprises 4 photodiode device.
At present, the coherent light detuner adopts based on PLC(Planar Optical Waveguide, planar optical waveguide) optical mixer of technology realizes the demodulation of light signal.Fig. 2 is based on the schematic diagram of the optical mixer of PLC technology.The modulation signal of DP-QPSK light signal is after the PBS beam splitting, and a branch of polarized light is imported the modulation signal input port (Signal) of first optical mixer; Simultaneously, local reference laser signal polarization light with same frequency, same-amplitude and identical polarization state of a branch of and this polarized light is imported the reference signal input port (Local) of first optical mixer.After this two bundles polarized light mixes through the optical mixer of being made up of coupling mechanism 201-204 and planar optical waveguide 205-208, at output port 1(OUT1) and output port 2(OUT2) obtain having two bundle coherent light output signals of DP-QPSK light signal information, thus demodulate the DP-QPSK light signal of this polarization state.The modulation signal of DP-QPSK light signal another bundle polarized light after the PBS beam splitting is imported the modulation signal input port of second optical mixer; Simultaneously, local reference signal polarized light with same frequency, same-amplitude and identical polarization direction of a branch of and this polarized light is imported the reference signal input port of second optical mixer.In like manner, obtain two bundle coherent light output signals at the output port of second optical mixer, thereby demodulate the DP-QPSK light signal of this polarization state.
Yet, the production cost height of employing PLC technology, desired equipment has high input, and big based on the optical mixer insertion loss of PLC technology, easily temperature influence.
Therefore, be necessary to provide a kind of cost low, the insertion loss is little, and the optical mixer that temperature stability is high is to realize the demodulation to the restituted signal of DP-QPSK light signal.
Summary of the invention
Embodiments of the invention provide a kind of optical mixer and have used the method that optical mixer carries out the signal demodulation, in order to reduce the cost of optical mixer, realize the demodulation to the DP-QPSK light signal at lower cost.
According to an aspect of the present invention, provide a kind of optical mixer, having comprised: two cubical non-polarized light beam beam splitter BS, and two cubical polarising beam splitter PBS; Wherein,
Two BS and two PBS form a rectangular parallelepiped piece, and the beam splitting interface of two BS is arranged in first plane, and the beam splitting interface of two PBS is arranged in second plane; First plane is vertical mutually with second plane;
The light beam incident interface of a PBS among described two PBS is as the modulation signal incident interface of described optical mixer; The light beam incident interface of the 2nd PBS among described two PBS is as the reference signal incident interface of described optical mixer;
Two the outgoing interfaces of a BS among described two BS are respectively as two first polarization state output signal outgoing interfaces of described optical mixer, and two the outgoing interfaces of the 2nd BS among described two BS are respectively as two second polarization state output signal outgoing interfaces of described optical mixer.
Preferably, a PBS, the first light beam incident interface of its light beam transmissive interface and a BS coincides, and the first light beam incident interface of its beam reflection interface and the 2nd BS coincides; After modulation signal is injected a PBS from the center, light beam incident interface of a PBS, after the transmission effect at the beam splitting interface in a PBS, the light signal of first polarization state in the described modulation signal incides a BS from the first light beam incident interface of a BS; After the reflex at the beam splitting interface of described modulation signal in a PBS, wherein the light signal of second polarization state incides the 2nd BS from the first light beam incident interface of the 2nd BS;
The 2nd PBS, the second light beam incident interface of its light beam transmissive interface and a BS coincides, and the second light beam incident interface of its beam reflection interface and the 2nd BS coincides; After the reference signal that has same frequency and a same-amplitude with described modulation signal is injected the 2nd PBS from the center, light beam incident interface of the 2nd PBS, after the transmission effect at the beam splitting interface in the 2nd PBS, the light signal of first polarization state in the described reference signal incides a BS from the second light beam incident interface of a BS; After the reflex at the beam splitting interface of described reference signal in the 2nd PBS, wherein the light signal of second polarization state incides the 2nd BS from the second light beam incident interface of the 2nd BS; Wherein, the first light beam incident interface of a BS and the second light beam incident interface are positioned at the both sides at the beam splitting interface of a BS;
Output light signal after obtaining demodulation after the beam splitting of light signal in a BS of the light signal of first polarization state of described modulation signal and first polarization state of reference signal mixes mutually after the beam splitting at the interface, is concerned with is penetrated by two outgoing interfaces of a BS respectively; Output light signal after obtaining demodulation after the beam splitting of light signal in the 2nd BS of the light signal of second polarization state of modulation signal and second polarization state of reference signal mixes mutually after the beam splitting at the interface, is concerned with is penetrated by two outgoing interfaces of the 2nd BS respectively.
Preferably, described BS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, becomes the beam splitting interface of described BS in order to incident beam is divided into the two-beam of polarization irrelevant, and its splitting ratio is 50:50.
Preferably, described PBS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, becomes the beam splitting interface of described PBS in order to incident beam is divided into two bundle polarized lights of polarization state quadrature.
According to another aspect of the present invention, also provide a kind of optical mixer, having comprised: two non-polarized light beam beam splitter BS are respectively a BS, the 2nd BS; And two polarising beam splitter PBS, be respectively a PBS, the 2nd PBS; Wherein,
The one PBS, the first light beam incident interface of its light beam transmissive interface and a BS coincides, and the first light beam incident interface of its beam reflection interface and the 2nd BS coincides; After modulation signal is injected a PBS from the center, light beam incident interface of a PBS, after the transmission effect at the beam splitting interface in a PBS, the light signal of first polarization state in the described modulation signal incides a BS from the first light beam incident interface of a BS; After the reflex at the beam splitting interface of described modulation signal in a PBS, wherein the light signal of second polarization state incides the 2nd BS from the first light beam incident interface of the 2nd BS; The light beam incident interface of the one PBS is as the modulation signal incident interface of described optical mixer;
The 2nd PBS, the second light beam incident interface of its light beam transmissive interface and a BS coincides, and the second light beam incident interface of its beam reflection interface and the 2nd BS coincides; After reference signal is injected the 2nd PBS from the center, light beam incident interface of the 2nd PBS, after the transmission effect at the beam splitting interface in the 2nd PBS, the light signal of first polarization state in the described reference signal incides a BS from the second light beam incident interface of a BS; After the reflex at the beam splitting interface of described reference signal in the 2nd PBS, wherein the light signal of second polarization state incides the 2nd BS from the second light beam incident interface of the 2nd BS; Wherein, the first light beam incident interface of a BS and the second light beam incident interface are positioned at the both sides at the beam splitting interface of a BS; The light beam incident interface of the 2nd PBS is as the reference signal incident interface of described optical mixer;
Output light signal after obtaining demodulation after the beam splitting of light signal in a BS of the light signal of first polarization state of described modulation signal and first polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of a BS respectively; Output light signal after obtaining demodulation after the beam splitting of light signal in the 2nd BS of the light signal of second polarization state of modulation signal and second polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of the 2nd BS respectively; Two outgoing interfaces of the one BS are respectively as two first polarization state output signal outgoing interfaces of described optical mixer, and two outgoing interfaces of the 2nd BS are respectively as two second polarization state output signal outgoing interfaces of described optical mixer.
Preferably, described BS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, becomes the beam splitting interface of described BS in order to incident beam is divided into the two-beam of polarization irrelevant, and its splitting ratio is 50:50; And
Described PBS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, becomes the beam splitting interface of described PBS in order to incident beam is divided into two bundle polarized lights of polarization state quadrature.
According to another aspect of the present invention, also provide a kind of coherent light detuner, having comprised: above-mentioned optical mixer and 2 tunnel input collimating apparatus and 4 road output collimators;
The axis direction of the modulation signal input collimating apparatus in described 2 tunnel input collimating apparatuss is perpendicular to the modulation signal incident interface of described optical mixer; One end of described modulation signal input collimating apparatus is as the modulation signal input end of described coherent light detuner, described modulation signal is after the modulation signal input end input of described coherent light detuner, and described modulation signal input collimating apparatus collimates to described modulation signal; Described modulation signal outputs to the modulation signal incident interface of described optical mixer from the other end of described modulation signal input collimating apparatus;
The axis direction of the reference signal input collimating apparatus in described 2 tunnel input collimating apparatuss is perpendicular to the reference signal incident interface of described optical mixer; One end of described reference signal input collimating apparatus is as the reference signal input end of described coherent light detuner, described reference signal is after the reference signal input end input of described coherent light detuner, and described reference signal input collimating apparatus collimates to described reference signal; Described reference signal outputs to the reference signal incident interface of optical mixer from the other end of described reference signal input collimating apparatus;
The axis direction of described 4 road output collimators is respectively perpendicular to two first polarization state output signal outgoing interfaces and two second polarization state output signal outgoing interfaces of described optical mixer, in order to the output light signal of exporting described optical mixer is collimated; 4 tunnel output light signals of described optical mixer output are respectively from the end input of 4 road output collimators, and the other end is exported; The other end of described 4 road output collimators is respectively as 4 light signal output ends of described coherent light detuner.
According to another aspect of the present invention, also provide a kind of coherent optical heterodyne communicatio, having comprised: above-mentioned coherent light detuner, PD receiving device array and signal amplify and control circuit; Wherein,
Modulation signal is by the modulation signal input end input of described coherent light detuner, and reference signal is by the reference signal input end input of described coherent light detuner; Described modulation signal is exported two first polarization state output signals and the second polarization state output signal respectively from 4 road output terminals of described coherent light detuner after the demodulation of described coherent light detuner;
Described PD receiving device array comprises 4 photodiode device; Two in described 4 photodiode device as the described first polarization state light signal receiving, two described first polarization state output signals to the output of described coherent light detuner output terminal receive respectively, are converted to be input to described signal behind the electric signal and to amplify and control circuit;
In described 4 photodiode device in addition two as the described second polarization state light signal receiving, two described second polarization state output signals to the output of described coherent light detuner output terminal receive respectively, are converted to be input to described signal behind the electric signal and to amplify and control circuit;
The electric signal difference that described signal amplifies and control circuit is exported two described first polarization state light signal receivings is one road electric signal; The electric signal difference that described signal amplifies and control circuit is exported two described second polarization state light signal receivings is another road electric signal; Described signal amplification and control circuit also amplify the two-way differential electric signal and control.
According to another aspect of the present invention, also provide a kind of method that optical mixer carries out the signal demodulation of using, wherein,
Described optical mixer comprises: two cubical non-polarized light beam beam splitter BS are respectively a BS, the 2nd BS; And two cubical polarising beam splitter PBS, be respectively a PBS, the 2nd PBS; Wherein, the first light beam incident interface of the light beam transmissive interface of a PBS and a BS coincides, and the first light beam incident interface of the beam reflection interface of a PBS and the 2nd BS coincides; The second light beam incident interface of the light beam transmissive interface of the 2nd PBS and a BS coincides, and the second light beam incident interface of the beam reflection interface of the 2nd PBS and the 2nd BS coincides;
Said method comprises:
After modulation signal is injected a PBS from the center, light beam incident interface of a PBS, after the transmission effect at the beam splitting interface in a PBS, the light signal of first polarization state in the described modulation signal incides a BS from the first light beam incident interface of a BS; After the reflex at the beam splitting interface of described modulation signal in a PBS, wherein the light signal of second polarization state incides the 2nd BS from the first light beam incident interface of the 2nd BS; The light beam incident interface of a described PBS is the modulation signal incident interface of described optical mixer;
After the reference signal that has same frequency and a same-amplitude with described modulation signal is injected the 2nd PBS from the center, light beam incident interface of the 2nd PBS, after the transmission effect at the beam splitting interface in the 2nd PBS, the light signal of first polarization state in the described reference signal incides a BS from the second light beam incident interface of a BS; After the reflex at the beam splitting interface of described reference signal in the 2nd PBS, wherein the light signal of second polarization state incides the 2nd BS from the second light beam incident interface of the 2nd BS; Wherein, the first light beam incident interface of a BS and the second light beam incident interface are positioned at the both sides at the beam splitting interface of a BS; The light beam incident interface of described the 2nd PBS is the reference signal incident interface of described optical mixer;
Output light signal after obtaining demodulation after the beam splitting of light signal in a BS of the light signal of first polarization state of described modulation signal and first polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of a BS respectively; Output light signal after obtaining demodulation after the beam splitting of light signal in the 2nd BS of the light signal of second polarization state of modulation signal and second polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of the 2nd BS respectively; Two outgoing interfaces of a described BS are two first polarization state output signal outgoing interfaces of described optical mixer, and two outgoing interfaces of described the 2nd BS are two second polarization state output signal outgoing interfaces of described optical mixer.
Preferably, first polarization state is the directions X polarization state, and second polarization state is the Y-direction polarization state; Perhaps
First polarization state is the Y-direction polarization state, and second polarization state is the directions X polarization state.
In the technical scheme of the present invention, optical mixer has been avoided use planar optical waveguide PLC technology, but adopted cost lower, insert that loss is less, temperature stability is higher, realize demodulation to modulation signal based on the cubical non-polarized light beam beam splitter BS of space optics and cubical polarising beam splitter PBS; Thereby reduced the cost of optical mixer, reduced the insertion loss of optical mixer, improved the temperature stability of optical mixer; Further, reduced and used the coherent light detuner of optical mixer and cost of products and the desired equipment cost of coherent optical heterodyne communicatio, and realized the demodulation to the restituted signal of DP-QPSK light signal.
Description of drawings
Fig. 1 is the inner structure block diagram of coherent optical heterodyne communicatio;
Fig. 2 is the schematic diagram based on the optical mixer of PLC technology;
Fig. 3 is the optical mixer of the embodiment of the invention and the method figure of restituted signal thereof;
Fig. 4 is the coherent light detuner synoptic diagram of the embodiment of the invention;
Fig. 5 is the coherent optical heterodyne communicatio inner structure block diagram of the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.Yet, need to prove that many details of listing in the instructions only are in order to make the reader to one or more aspects of the present invention a thorough understanding be arranged, even if there are not these specific details also can realize these aspects of the present invention.
The present inventor considers, can adopt cost lower, insert that loss is less, temperature stability is higher, the optical mixer of realizing the demodulation of DP-QPSK light signal based on cubical non-polarized light beam beam splitter BS and the cubical polarising beam splitter PBS of space optics.BS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of two right-angle prisms, becomes the beam splitting interface of BS in order to incident beam is divided into the two-beam of polarization irrelevant, and its splitting ratio is 50:50.PBS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of two right-angle prisms, becomes the beam splitting interface of PBS in order to incident beam is divided into two bundle polarized lights of polarization state quadrature.Thus, reduced the cost of product, equipment based on the optical mixer of BS and PBS, reduced the insertion loss, and improved temperature stability.
Describe the technical scheme of the embodiment of the invention in detail below in conjunction with accompanying drawing.The optical mixer that the embodiment of the invention provides and the method for restituted signal thereof, as shown in Figure 3.
Optical mixer of the present invention comprises cubical non-polarized light beam beam splitter the one BS301 and the 2nd BS304 and cubical polarising beam splitter the one PBS302 and the 2nd PBS303.The one BS301, the 2nd BS304, the 2nd PBS302 and a PBS303 form a rectangular parallelepiped piece, and the beam splitting interface of a BS301 and the 2nd BS304 is arranged in first plane, and the beam splitting interface of the 2nd PBS302 and a PBS303 is arranged in second plane; First plane is vertical mutually with second plane.
The first light beam incident interface of the light beam transmissive interface of the one PBS303 and a BS301 coincides, and the first light beam incident interface of the beam reflection interface of a PBS303 and the 2nd BS304 coincides.The second light beam incident interface of the light beam transmissive interface of the 2nd PBS302 and a BS301 coincides, and the second light beam incident interface of the beam reflection interface of the 2nd PBS302 and the 2nd BS304 coincides.
Use the method that optical mixer of the present invention carries out the signal demodulation, comprising:
The modulation signal 310 of DP-QPSK light signal is injected a PBS303 from the center, light beam incident interface of a PBS303, after the transmission effect at the beam splitting interface in a PBS303, the light signal of first polarization state in the modulation signal incides a BS301 from the light beam incident interface of a BS301; After the reflex at the beam splitting interface of modulation signal in a PBS303, wherein the light signal of second polarization state incides the 2nd BS304 from the first light beam incident interface of the 2nd BS304.The light beam incident interface of the one PBS303 is the modulation signal incident interface of optical mixer.
After the reference signal 320 that has same frequency and a same-amplitude with modulation signal is injected the 2nd PBS302 from the center, light beam incident interface of the 2nd PBS302, after the transmission effect at the beam splitting interface in the 2nd PBS302, the light signal of first polarization state in the reference signal incides a BS301 from the second light beam incident interface of a BS301; After the reflex at the beam splitting interface of reference signal in the 2nd PBS302, wherein the light signal of second polarization state incides the 2nd BS304 from the second light beam incident interface of the 2nd BS304; Wherein, the first light beam incident interface of a BS301 and the second light beam incident interface are positioned at the both sides at the beam splitting interface of a BS301.The light beam incident interface of the 2nd PBS302 is the reference signal incident interface of optical mixer.
Wherein, first polarization state is the directions X polarization state, and second polarization state is the Y-direction polarization state; Perhaps first polarization state is the Y-direction polarization state, and second polarization state is the directions X polarization state.
Therefore, obtain having the output light signal 330 after the 4 bundle demodulation of DP-QPSK light signal information at two first polarization state output signal outgoing interfaces of optical mixer and two second polarization state output signal outgoing interfaces, 340,350 and 360, thus realized the demodulation of DP-QPSK light signal.
Embodiments of the invention also provide a kind of coherent light detuner that adopts optical mixer structure of the present invention, as shown in Figure 4:
This coherent light detuner comprises optical mixer 405 of the present invention and 2 tunnel input collimating apparatuss 410,420 and 4 road output collimators 430,440,450,460.
The axis direction of the modulation signal input collimating apparatus 410 in 2 tunnel input collimating apparatuss is perpendicular to the modulation signal incident interface of optical mixer, in order to the modulation signal that is input to optical mixer is collimated; The one end is as the modulation signal input end of coherent light detuner 501, and modulation signal outputs to the modulation signal incident interface of optical mixer from the other end of modulation signal input collimating apparatus 410 after the modulation signal input end input of coherent light detuner 501.
The axis direction of the reference signal input collimating apparatus 420 in 2 tunnel input collimating apparatuss is perpendicular to the reference signal incident interface of optical mixer, in order to the reference signal that is input to described optical mixer is collimated; The one end is as the reference signal input end of coherent light detuner 501, and reference signal outputs to the reference signal incident interface of optical mixer from the other end of reference signal input collimating apparatus 410 after the reference signal input end input of coherent light detuner 501.
4 road output collimators 430,440,450 and 460 axis direction is respectively perpendicular to two first polarization state output signal outgoing interfaces and two second polarization state output signal outgoing interfaces of optical mixer, in order to respectively to the output light signal 330 after 4 tunnel demodulation of exporting described optical mixer, 340,350 and 360 collimate: from the end input of 4 road output collimators, export respectively by the other end for the output light signal after 4 tunnel demodulation of output optical mixer; The other end of described 4 road output collimators is respectively as 4 light signal output ends of described coherent light detuner.
Embodiments of the invention also provide a kind of coherent optical heterodyne communicatio, as shown in Figure 5, comprising: coherent light detuner 501 of the present invention, PD receiving device array 502 and signal amplify and control circuit 503.
Modulation signal is by the modulation signal input end input of coherent light detuner 501, and reference signal is by the reference signal input end input of coherent light detuner 501; Modulation signal is exported two first polarization state output signals and the second polarization state output signal respectively from 4 road output terminals of coherent light detuner 501 after 501 demodulation of coherent light detuner.
PD receiving device array 502 comprises 4 photodiode device; Two in 4 photodiode device as the first polarization state light signal receiving, two first polarization state output signals to coherent light detuner output terminal 430 and 440 outputs receive respectively, are converted to be input to signal behind the electric signal and to amplify and control circuit 503; The electric signal difference that signal amplifies and control circuit 503 is exported two first polarization state light signal receivings is one road electric signal;
In 4 photodiode device in addition two as the second polarization state light signal receiving, two second polarization state output signals to coherent light detuner output terminal 450 and 460 outputs receive respectively, are converted to be input to signal behind the electric signal and to amplify and control circuit 503; The electric signal difference that signal amplifies and control circuit 530 is exported two second polarization state light signal receivings is another road electric signal.
Signal amplification and control circuit 530 also amplify the two-way differential electric signal and control, and finish the demodulation to light signal.Thus, realize understanding the coherent optical heterodyne communicatio that mediation receives the DP-QPSK light signal.
In the optical mixer technical scheme of the embodiment of the invention, optical mixer has been avoided use planar optical waveguide PLC technology, but adopted cost lower, insert that loss is less, temperature stability is higher, realize demodulation to modulation signal based on the cubical non-polarized light beam beam splitter BS of space optics and cubical polarising beam splitter PBS; Thereby reduced the cost of optical mixer, reduced the insertion loss of optical mixer, improved the temperature stability of optical mixer; Further, reduced and used the coherent light detuner of optical mixer and cost of products and the desired equipment cost of coherent optical heterodyne communicatio, and realized the demodulation to the restituted signal of DP-QPSK light signal.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an optical mixer is characterized in that, comprising: two cubical non-polarized light beam beam splitter BS, and two cubical polarising beam splitter PBS; Wherein,
Two BS and two PBS form a rectangular parallelepiped piece, and the beam splitting interface of two BS is arranged in first plane, and the beam splitting interface of two PBS is arranged in second plane; First plane is vertical mutually with second plane;
The light beam incident interface of a PBS among described two PBS is as the modulation signal incident interface of described optical mixer; The light beam incident interface of the 2nd PBS among described two PBS is as the reference signal incident interface of described optical mixer;
Two the outgoing interfaces of a BS among described two BS are respectively as two first polarization state output signal outgoing interfaces of described optical mixer, and two the outgoing interfaces of the 2nd BS among described two BS are respectively as two second polarization state output signal outgoing interfaces of described optical mixer.
2. optical mixer as claimed in claim 1 is characterized in that,
The one PBS, the first light beam incident interface of its light beam transmissive interface and a BS coincides, and the first light beam incident interface of its beam reflection interface and the 2nd BS coincides; After modulation signal is injected a PBS from the center, light beam incident interface of a PBS, after the transmission effect at the beam splitting interface in a PBS, the light signal of first polarization state in the described modulation signal incides a BS from the first light beam incident interface of a BS; After the reflex at the beam splitting interface of described modulation signal in a PBS, wherein the light signal of second polarization state incides the 2nd BS from the first light beam incident interface of the 2nd BS;
The 2nd PBS, the second light beam incident interface of its light beam transmissive interface and a BS coincides, and the second light beam incident interface of its beam reflection interface and the 2nd BS coincides; After the reference signal that has same frequency and a same-amplitude with described modulation signal is injected the 2nd PBS from the center, light beam incident interface of the 2nd PBS, after the transmission effect at the beam splitting interface in the 2nd PBS, the light signal of first polarization state in the described reference signal incides a BS from the second light beam incident interface of a BS; After the reflex at the beam splitting interface of described reference signal in the 2nd PBS, wherein the light signal of second polarization state incides the 2nd BS from the second light beam incident interface of the 2nd BS; Wherein, the first light beam incident interface of a BS and the second light beam incident interface are positioned at the both sides at the beam splitting interface of a BS;
Output light signal after obtaining demodulation after the beam splitting of light signal in a BS of the light signal of first polarization state of described modulation signal and first polarization state of reference signal mixes mutually after the beam splitting at the interface, is concerned with is penetrated by two outgoing interfaces of a BS respectively; Output light signal after obtaining demodulation after the beam splitting of light signal in the 2nd BS of the light signal of second polarization state of modulation signal and second polarization state of reference signal mixes mutually after the beam splitting at the interface, is concerned with is penetrated by two outgoing interfaces of the 2nd BS respectively.
3. optical mixer as claimed in claim 1 or 2 is characterized in that,
Described BS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, becomes the beam splitting interface of described BS in order to incident beam is divided into the two-beam of polarization irrelevant, and its splitting ratio is 50:50.
4. optical mixer as claimed in claim 1 or 2 is characterized in that,
Described PBS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, becomes the beam splitting interface of described PBS in order to incident beam is divided into two bundle polarized lights of polarization state quadrature.
5. an optical mixer is characterized in that, comprising: two non-polarized light beam beam splitter BS are respectively a BS, the 2nd BS; And two polarising beam splitter PBS, be respectively a PBS, the 2nd PBS; Wherein,
The one PBS, the first light beam incident interface of its light beam transmissive interface and a BS coincides, and the first light beam incident interface of its beam reflection interface and the 2nd BS coincides; After modulation signal is injected a PBS from the center, light beam incident interface of a PBS, after the transmission effect at the beam splitting interface in a PBS, the light signal of first polarization state in the described modulation signal incides a BS from the first light beam incident interface of a BS; After the reflex at the beam splitting interface of described modulation signal in a PBS, wherein the light signal of second polarization state incides the 2nd BS from the first light beam incident interface of the 2nd BS; The light beam incident interface of the one PBS is as the modulation signal incident interface of described optical mixer;
The 2nd PBS, the second light beam incident interface of its light beam transmissive interface and a BS coincides, and the second light beam incident interface of its beam reflection interface and the 2nd BS coincides; After reference signal is injected the 2nd PBS from the center, light beam incident interface of the 2nd PBS, after the transmission effect at the beam splitting interface in the 2nd PBS, the light signal of first polarization state in the described reference signal incides a BS from the second light beam incident interface of a BS; After the reflex at the beam splitting interface of described reference signal in the 2nd PBS, wherein the light signal of second polarization state incides the 2nd BS from the second light beam incident interface of the 2nd BS; Wherein, the first light beam incident interface of a BS and the second light beam incident interface are positioned at the both sides at the beam splitting interface of a BS; The light beam incident interface of the 2nd PBS is as the reference signal incident interface of described optical mixer;
Output light signal after obtaining demodulation after the beam splitting of light signal in a BS of the light signal of first polarization state of described modulation signal and first polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of a BS respectively; Output light signal after obtaining demodulation after the beam splitting of light signal in the 2nd BS of the light signal of second polarization state of modulation signal and second polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of the 2nd BS respectively; Two outgoing interfaces of the one BS are respectively as two first polarization state output signal outgoing interfaces of described optical mixer, and two outgoing interfaces of the 2nd BS are respectively as two second polarization state output signal outgoing interfaces of described optical mixer.
6. optical mixer as claimed in claim 5, it is characterized in that, described BS is bonded by two right-angle prisms, and scribble the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, become the beam splitting interface of described BS in order to incident beam is divided into the two-beam of polarization irrelevant, its splitting ratio is 50:50; And
Described PBS is bonded by two right-angle prisms, and scribbles the beam splitting deielectric-coating on the adhesive surface of described two right-angle prisms, becomes the beam splitting interface of described PBS in order to incident beam is divided into two bundle polarized lights of polarization state quadrature.
7. a coherent light detuner is characterized in that, comprising: as the described optical mixer of claim 1-6 and 2 tunnel input collimating apparatus and 4 road output collimators;
The axis direction of the modulation signal input collimating apparatus in described 2 tunnel input collimating apparatuss is perpendicular to the modulation signal incident interface of described optical mixer; One end of described modulation signal input collimating apparatus is as the modulation signal input end of described coherent light detuner, described modulation signal is after the modulation signal input end input of described coherent light detuner, and described modulation signal input collimating apparatus collimates to described modulation signal; Described modulation signal outputs to the modulation signal incident interface of described optical mixer from the other end of described modulation signal input collimating apparatus;
The axis direction of the reference signal input collimating apparatus in described 2 tunnel input collimating apparatuss is perpendicular to the reference signal incident interface of described optical mixer; One end of described reference signal input collimating apparatus is as the reference signal input end of described coherent light detuner, described reference signal is after the reference signal input end input of described coherent light detuner, and described reference signal input collimating apparatus collimates to described reference signal; Described reference signal outputs to the reference signal incident interface of optical mixer from the other end of described reference signal input collimating apparatus;
The axis direction of described 4 road output collimators is respectively perpendicular to two first polarization state output signal outgoing interfaces and two second polarization state output signal outgoing interfaces of described optical mixer, in order to the output light signal of exporting described optical mixer is collimated; 4 tunnel output light signals of described optical mixer output are respectively from the end input of 4 road output collimators, and the other end is exported; The other end of described 4 road output collimators is respectively as 4 light signal output ends of described coherent light detuner.
8. a coherent optical heterodyne communicatio is characterized in that, comprising: coherent light detuner as claimed in claim 7, and PD receiving device array and signal amplify and control circuit; Wherein,
Modulation signal is by the modulation signal input end input of described coherent light detuner, and reference signal is by the reference signal input end input of described coherent light detuner; Described modulation signal is exported two first polarization state output signals and the second polarization state output signal respectively from 4 road output terminals of described coherent light detuner after the demodulation of described coherent light detuner;
Described PD receiving device array comprises 4 photodiode device; Two in described 4 photodiode device as the described first polarization state light signal receiving, two described first polarization state output signals to the output of described coherent light detuner output terminal receive respectively, are converted to be input to described signal behind the electric signal and to amplify and control circuit;
In described 4 photodiode device in addition two as the described second polarization state light signal receiving, two described second polarization state output signals to the output of described coherent light detuner output terminal receive respectively, are converted to be input to described signal behind the electric signal and to amplify and control circuit;
The electric signal difference that described signal amplifies and control circuit is exported two described first polarization state light signal receivings is one road electric signal; The electric signal difference that described signal amplifies and control circuit is exported two described second polarization state light signal receivings is another road electric signal; Described signal amplification and control circuit also amplify the two-way differential electric signal and control.
9. use the method that optical mixer carries out the signal demodulation for one kind, it is characterized in that, described optical mixer comprises: two cubical non-polarized light beam beam splitter BS are respectively a BS, the 2nd BS; And two cubical polarising beam splitter PBS, be respectively a PBS, the 2nd PBS; Wherein, the first light beam incident interface of the light beam transmissive interface of a PBS and a BS coincides, and the first light beam incident interface of the beam reflection interface of a PBS and the 2nd BS coincides; The second light beam incident interface of the light beam transmissive interface of the 2nd PBS and a BS coincides, and the second light beam incident interface of the beam reflection interface of the 2nd PBS and the 2nd BS coincides;
Described method comprises:
After modulation signal is injected a PBS from the center, light beam incident interface of a PBS, after the transmission effect at the beam splitting interface in a PBS, the light signal of first polarization state in the described modulation signal incides a BS from the first light beam incident interface of a BS; After the reflex at the beam splitting interface of described modulation signal in a PBS, wherein the light signal of second polarization state incides the 2nd BS from the first light beam incident interface of the 2nd BS; The light beam incident interface of a described PBS is the modulation signal incident interface of described optical mixer;
After the reference signal that has same frequency and a same-amplitude with described modulation signal is injected the 2nd PBS from the center, light beam incident interface of the 2nd PBS, after the transmission effect at the beam splitting interface in the 2nd PBS, the light signal of first polarization state in the described reference signal incides a BS from the second light beam incident interface of a BS; After the reflex at the beam splitting interface of described reference signal in the 2nd PBS, wherein the light signal of second polarization state incides the 2nd BS from the second light beam incident interface of the 2nd BS; Wherein, the first light beam incident interface of a BS and the second light beam incident interface are positioned at the both sides at the beam splitting interface of a BS; The light beam incident interface of described the 2nd PBS is the reference signal incident interface of described optical mixer;
Output light signal after obtaining demodulation after the beam splitting of light signal in a BS of the light signal of first polarization state of described modulation signal and first polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of a BS respectively; Output light signal after obtaining demodulation after the beam splitting of light signal in the 2nd BS of the light signal of second polarization state of modulation signal and second polarization state of reference signal mixes after the beam splitting is at the interface mutually penetrated by two outgoing interfaces of the 2nd BS respectively; Two outgoing interfaces of a described BS are two first polarization state output signal outgoing interfaces of described optical mixer, and two outgoing interfaces of described the 2nd BS are two second polarization state output signal outgoing interfaces of described optical mixer.
10. the application optical mixer as claimed in claim 9 method of carrying out the signal demodulation is characterized in that first polarization state is the directions X polarization state, and second polarization state is the Y-direction polarization state; Perhaps
First polarization state is the Y-direction polarization state, and second polarization state is the directions X polarization state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310143205.0A CN103257402B (en) | 2013-04-23 | 2013-04-23 | Optical mixer and application optical mixer carry out the method for signal receiving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310143205.0A CN103257402B (en) | 2013-04-23 | 2013-04-23 | Optical mixer and application optical mixer carry out the method for signal receiving |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103257402A true CN103257402A (en) | 2013-08-21 |
| CN103257402B CN103257402B (en) | 2015-08-12 |
Family
ID=48961420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310143205.0A Active CN103257402B (en) | 2013-04-23 | 2013-04-23 | Optical mixer and application optical mixer carry out the method for signal receiving |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103257402B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014172841A1 (en) * | 2013-04-23 | 2014-10-30 | 青岛海信宽带多媒体技术有限公司 | Optical mixer and method for performing signal demodulation using optical mixer |
| WO2015165094A1 (en) * | 2014-04-30 | 2015-11-05 | 华为技术有限公司 | Receiver |
| CN115437160A (en) * | 2022-11-03 | 2022-12-06 | 北京中科国光量子科技有限公司 | Polarization insensitive space optical mixer |
| CN115542565A (en) * | 2022-11-03 | 2022-12-30 | 北京中科国光量子科技有限公司 | 90-degree space optical mixer insensitive to polarization |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007004084A1 (en) * | 2005-06-30 | 2007-01-11 | Koninklijke Philips Electronics N.V. | Waveguide for a projection engine |
| US20120249984A1 (en) * | 2011-03-30 | 2012-10-04 | Guido De Boer | Lithography system with differential interferometer module |
-
2013
- 2013-04-23 CN CN201310143205.0A patent/CN103257402B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007004084A1 (en) * | 2005-06-30 | 2007-01-11 | Koninklijke Philips Electronics N.V. | Waveguide for a projection engine |
| US20120249984A1 (en) * | 2011-03-30 | 2012-10-04 | Guido De Boer | Lithography system with differential interferometer module |
| CN102735163A (en) * | 2011-03-30 | 2012-10-17 | 迈普尔平版印刷Ip有限公司 | Alignment of an interferometer module for an exposure tool |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014172841A1 (en) * | 2013-04-23 | 2014-10-30 | 青岛海信宽带多媒体技术有限公司 | Optical mixer and method for performing signal demodulation using optical mixer |
| WO2015165094A1 (en) * | 2014-04-30 | 2015-11-05 | 华为技术有限公司 | Receiver |
| CN105850051A (en) * | 2014-04-30 | 2016-08-10 | 华为技术有限公司 | Receiver |
| US9960856B2 (en) | 2014-04-30 | 2018-05-01 | Huawei Technologies Co., Ltd | System and method for optical receiver |
| CN105850051B (en) * | 2014-04-30 | 2018-12-07 | 华为技术有限公司 | A kind of receiver |
| CN115437160A (en) * | 2022-11-03 | 2022-12-06 | 北京中科国光量子科技有限公司 | Polarization insensitive space optical mixer |
| CN115542565A (en) * | 2022-11-03 | 2022-12-30 | 北京中科国光量子科技有限公司 | 90-degree space optical mixer insensitive to polarization |
| CN115437160B (en) * | 2022-11-03 | 2023-01-03 | 北京中科国光量子科技有限公司 | Polarization insensitive space optical mixer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103257402B (en) | 2015-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107925484B (en) | Monolithic integrated coherent light receiver chip | |
| CN104459904B (en) | A kind of single fiber bi-directional BOSA structure | |
| US8855502B2 (en) | Demodulator and optical transceiver | |
| US7573641B2 (en) | Free-space optical hybrid | |
| US8538275B2 (en) | Multimode optical communication | |
| WO2011027895A1 (en) | Plc type demodulator and optical transmission system | |
| CN103401610A (en) | Differential-type circularly-polarized laser carrier communication system | |
| CN105353520B (en) | 90 ° of frequency mixers of spatial light of high mixing efficiency | |
| US9319169B2 (en) | Orthogonally-combining interleaving filter multiplexer and systems and methods using same | |
| CN102364364A (en) | Single-wavelength and single-fiber bidirectional light transceiving module assembly | |
| CN103257402B (en) | Optical mixer and application optical mixer carry out the method for signal receiving | |
| KR101492314B1 (en) | Multimode optical communication | |
| CN103091869A (en) | Integrated coherent-light-communication electro-optical modulator structure | |
| CN105827356A (en) | Two-path terahertz wave communication system | |
| CN103532623B (en) | Photo-communication relay transmission method and system based on polarization shift keying modulation | |
| US9442248B2 (en) | Polarization beam combiner/splitter, polarization beam combining/splitting structure, light mixer, optical modulator module, and method for manufacturing polarization beam combiner/splitter | |
| CN105790846A (en) | Wired-and-wireless-optical-transmission-based double-polarization differential quadrature phase shift keying access apparatus | |
| CN202818311U (en) | Coherent optical receiver | |
| CN104838605A (en) | Optical transceiver and method for processing optical signal | |
| CN104487878A (en) | Polarization separator, polarization separation structure, optical mixer, and method for manufacturing polarization separator | |
| CN107431552A (en) | Optical module and the network equipment | |
| WO2014172841A1 (en) | Optical mixer and method for performing signal demodulation using optical mixer | |
| CN202649537U (en) | Dual-optical-fiber three-directional optical wave selector | |
| US20240080124A1 (en) | Multi-carrier transmitter with integrated multiplexer and receiver with integrated demultiplexer | |
| CN218958917U (en) | Space optical communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |