CN102142902A - Method and device for realizing direct detection and coherent detection - Google Patents

Method and device for realizing direct detection and coherent detection Download PDF

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Publication number
CN102142902A
CN102142902A CN2010105541509A CN201010554150A CN102142902A CN 102142902 A CN102142902 A CN 102142902A CN 2010105541509 A CN2010105541509 A CN 2010105541509A CN 201010554150 A CN201010554150 A CN 201010554150A CN 102142902 A CN102142902 A CN 102142902A
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light signal
signal
delay
subelement
coupling optical
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CN102142902B (en
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方圆圆
李良川
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JIANGSU KELI NEW MATERIAL CO., LTD.
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Huawei Technologies Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/06Polarisation multiplex systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60Receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/002Coherencemultiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0221Power control, e.g. to keep the total optical power constant

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  • Computer Networks & Wireless Communication (AREA)
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  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention provides a method and device for realizing direct detection and coherent detection. The method comprises the steps of: firstly, dividing received optical signals into a first path of optical signals and a second path of optical signals, carrying out power allocation on the first path of optical signals to obtain a first optical signal and a second optical signal, and carrying out polarization splitting on the second path of optical signals to obtain a first optical signal and a second optical signal; secondly, selecting an optical signal subjected to output power allocation or an optical signal subjected to output polarization splitting according to a received control signal; and finally, carrying out direct detection or coherent detection on the output optical signal. Power allocation or polarization splitting is carried out on the optical signal according to the control signal, and direct detection or coherent detection can be flexibly carried out to ensure that a single-polarization or polarization multiplexing system can adapt to different rates of an intermediate node.

Description

A kind of method and apparatus of realizing directly detection and coherent detection
Technical field
The present invention relates to the communication technology, relate in particular to a kind of method and apparatus of realizing directly detection and coherent detection.
Background technology
At present in order to improve Optical Fiber Transmission efficient and spectrum efficiency, need to adopt different modulation formats, for example important modulation format comprises DPSK (Differential Phase Shift Keying, differential phase keying (DPSK)), QPSK (Quadrature Phase Shift Keying, quarternary phase-shift keying (QPSK)) or PDM-QPSK (Polarization Division Multiplexing-QPSK, the quarternary phase-shift keying (QPSK) of palarization multiplexing) etc. all adopted widely, wherein sign indicating number such as DPSK and DQPSK type all needs to adopt direct detection, and sign indicating number types such as PDM-QPSK then need to adopt coherent detection.
Directly detecting is that the light signal that will receive is directly sent into photodetector, thereby draws the process of useful signal; Coherent detection then is to utilize local oscillation signal and the light signal that receives to carry out the process that Frequency mixing processing draws useful signal, and it is compared with direct detection, can improve the sensitivity of receiver, is applicable to the more modulation format of spectral efficient simultaneously.
Have only separately DQPSK at present or DPSK directly detects or separately PDM-QPSK is carried out the method and apparatus of coherent detection, can not realize simultaneously directly detecting and the method and apparatus of coherent detection for one.
Summary of the invention
Embodiments of the invention provide a kind of method and apparatus of realizing directly detection and coherent detection, can select flexibly directly to detect or coherent detection according to control signal.
The embodiment of the invention provides a kind of device of realizing directly detection and coherent detection, comprising:
Receiving element is used for receiving optical signals;
Optical branching device is used for the light signal that receiving element receives is divided into the first via light signal and the second road light signal, and first via light signal is sent into power distributing unit, and the second road light signal is sent into polarization beam-splitting unit;
Power distributing unit is used for that first via light signal is carried out power division and exports first light signal and second light signal;
Polarization beam-splitting unit is used for that the second road light signal is carried out polarization beam splitting and exports first light signal and second light signal;
Switch unit is used for selecting the light signal of power distributing unit output or the light signal of polarization beam-splitting unit output according to the control signal that receives;
Detecting unit is used for the light signal of switch unit output is directly detected or coherent detection.
The embodiment of the invention also provides a kind of method that realizes directly detection and coherent detection, comprising:
The light signal that receives is divided into the first via light signal and the second road light signal;
The first via is carried out power division and is obtained first light signal and second light signal, and the second road light signal carries out polarization beam splitting and obtains first light signal and second light signal;
According to light signal after the control signal selection power output distribution that receives or the light signal after the output polarization beam splitting;
Light signal to output directly detects or coherent detection.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, light signal after it distributes according to control signal selection power output or the light signal behind the polarization beam splitting, can directly detect flexibly or coherent detection, make the different rates that in single polarized systems or polarisation multiplex system, can adapt to intermediate node.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of apparatus structure schematic diagram of realizing directly detection and coherent detection that Fig. 1 provides for the embodiment of the invention;
A kind of further structural representation of realizing directly detection and coherent detection device that Fig. 2 provides for the embodiment of the invention;
A kind of method flow schematic diagram of realizing directly detection and coherent detection that Fig. 3 provides for the embodiment of the invention;
A kind of further schematic flow sheet of realizing directly detection and coherence detection that Fig. 4 provides for the embodiment of the invention;
Fig. 5 is that DQPSK is a kind of method flow schematic diagram of realizing directly detection and coherent detection of example explanation for the embodiment of the invention with the light signal that receives;
Fig. 6 is that DQPSK is a kind of apparatus structure schematic diagram of realizing directly detection and coherent detection of example explanation for the embodiment of the invention with the light signal that receives;
Fig. 7 is that PDM-QPSK is a kind of method flow schematic diagram of realizing directly detection and coherent detection of example explanation for the embodiment of the invention with the light signal that receives;
Fig. 8 is that PDM-QPSK is a kind of apparatus structure schematic diagram of realizing directly detection and coherent detection of example explanation for the embodiment of the invention with the light signal that receives.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention provides a kind of device of realizing directly detection and coherent detection, as shown in Figure 1, comprising:
Receiving element 11 is used for receiving optical signals;
Optical branching device 12 is used for the light signal that receiving element 11 receives is divided into the first via light signal and the second road light signal, and first via light signal is sent into power distributing unit 13, and the second road light signal is sent into polarization beam-splitting unit 14;
Power distributing unit 13 is used for that first via light signal is carried out power division and exports first light signal and second light signal;
Polarization beam-splitting unit 14 is used for that the second road light signal is carried out polarization beam splitting and exports first light signal and second light signal;
Switch unit 15 is used for selecting the light signal of power distributing unit 13 outputs or the light signal of polarization beam-splitting unit 14 outputs according to the control signal that receives;
Detecting unit 16 is used for the light signal of switch unit 15 outputs is directly detected or coherent detection.
Particularly,, then directly detect,, then carry out coherent detection if switch unit selects output is the light signal of polarization beam-splitting unit 14 outputs if switch unit selects output is the light signal of power distributing unit 13 outputs.
Further, said apparatus as shown in Figure 2, can also comprise:
Control unit 21 is used to receive the control signal by the transmitting terminal transmission of described light signal, and described control signal is sent to switch unit; Or be used for being received in the control signal that receiving element 11 feeds back, and described control signal is sent to switch unit by the interface that the outside is reserved.
Further, the control signal of all right artificial selection control unit 21 specifically can be selected by the sign indicating number type of described light signal, for example, if described light signal is DPSK, then selects control unit 21 to transmit control signal and control the light signal that switch unit 15 power output allocation units 13 are exported; If described light signal is PDM-QPSK, then selects control unit 21 to transmit control signal and control the light signal that switch unit 15 output polarization beam splitting unit 14 are exported.
The transmitting terminal of light signal can transmit control signal according to the sign indicating number type of light signal to control unit 21, for example, if the light signal that transmitting terminal sends is DPSK, then transmit control signal to the light signal of control unit 21 with 13 outputs of control switch unit 15 power output allocation units; If the light signal that transmitting terminal sends is PDM-QPSK, then transmit control signal to the light signal of control unit 21 with 15 output polarization beam splitting unit, 14 outputs of control switch unit.
Can contain power detection module in the receiving element 11, whether be used to detect the light signal that receives equates at the power of two polarization states, if equate, then be polarisation-multiplexed signal, the light signal of feedback control signal control this moment switch unit 15 output polarization beam splitting unit, 14 outputs; If unequal, then be single polarization signal, the light signal of feedback control signal control this moment switch unit 15 power output allocation units 13 outputs.For example, the light signal that receives is DPSK, and then control unit 21 is received the control signal of receiving element 11 feedbacks, and sends the light signal of described control signal control switch unit 15 power output allocation units 13 outputs; If the light signal that receives is PDM-QPSK, then control unit 21 is received the control signal of receiving element 11 feedbacks, and sends the light signal of described control signal control switch unit 15 output polarization beam splitting unit, 14 outputs.
Particularly, detecting unit 16 comprises:
First beam split time-delay subelement 1601, be used for that first light signal that switch unit 15 is exported is carried out beam split and obtain the first non-time-delay light signal and the second non-time-delay light signal, and the first non-time-delay light signal employing adjustable delay line of inciting somebody to action wherein carries out delay process, the output first time-delay light signal and the second non-time-delay light signal;
Second beam split time-delay subelement 1602, be used for that second light signal that switch unit 15 is exported is carried out beam split and obtain the 3rd non-time-delay light signal and the 4th non-time-delay light signal, and the 4th non-time-delay light signal that will be wherein adopts the adjustable delay line to carry out delay process, exports the 3rd non-time-delay light signal and the 4th time-delay light signal.
Particularly, the adjustable delay line can specifically be determined the bit of time-delay according to the character rate of signal, the inverse that is the character rate of signal is the time-delay bit, it adopts time-delay adjustable, can adapt to different operating rates, avoid existing direct detecting method can only work in the situation of fixing speed.
Further, detecting unit 16 also comprises:
The first beam split subelement 1611 is used for the first time-delay light signal of first beam split time-delay subelement, 1601 outputs is coupled, and exports first coupling optical signal and second coupling optical signal;
The second beam split subelement 1612 is used for being coupled with the second non-time-delay light signal of first beam split time-delay subelement, 1601 outputs or with the local oscillator light signal according to control signal, exports the 3rd coupling optical signal and the 4th coupling optical signal;
The 3rd beam split subelement 1613 is used for being coupled with the 3rd non-time-delay light signal of second beam split time-delay subelement, 1602 outputs or with the local oscillator light signal according to control signal, exports the 5th coupling optical signal and the 6th coupling optical signal;
The 4th beam split subelement 1614 is used for the 4th time-delay light signal of second beam split time-delay subelement, 1602 outputs is coupled, and exports the 7th coupling optical signal and the 8th coupling optical signal;
The first phase delay subelement 1621 is used for that second coupling optical signal that the first beam split subelement 1611 is exported is carried out phase delay and obtains the second phase delay light signal;
The second phase delay subelement 1622 is used for that the 4th coupling optical signal that the second beam split subelement 1612 is exported is carried out phase delay and obtains the 4th phase delay light signal;
The third phase position postpones subelement 1623, is used for that the 6th coupling optical signal that the 3rd beam split subelement 1613 is exported is carried out phase delay and obtains the 6th phase delay light signal;
The 4th phase delay subelement 1624 is used for that the 8th coupling optical signal that the 4th beam split subelement 1614 is exported is carried out phase delay and obtains the eight-phase delayed optical signal;
The first coupling output subelement 1631 is used for the 3rd coupling optical signal with first coupling optical signal of the first beam split subelement, 1611 outputs and 1612 outputs of the second beam split subelement back that is coupled and exports;
The second coupling output subelement 1632 is used for the 4th phase delay light signal with the second phase delay light signal of the first phase delay subelement, 1621 outputs and 1622 outputs of the second phase delay subelement back that is coupled and exports;
The 3rd coupling output subelement 1633 is used for the 7th coupling optical signal with the 5th coupling optical signal of the 3rd beam split subelement 1613 outputs and 1614 outputs of the 4th beam split subelement back that is coupled and exports;
Export the 4th coupling output subelement 1634, the 6th phase delay light signal that is used for the third phase position is postponed subelement 1623 outputs and the eight-phase delayed optical signal of the 4th phase delay subelement 1624 outputs back that is coupled.
Particularly, local oscillator light signal in the second beam split subelement 1612 and the 3rd beam split subelement 1613 can be provided respectively by two lasers, also can obtain by beam split by a laser, control signal in the second beam split subelement 1612 and the 3rd beam split subelement 1613 is provided by control unit, select the light signal of power output allocation units 13 outputs when described control unit 21 control switch units 15, then control the second beam split subelement 1,612 the second non-time-delay light signal of first beam split time-delay subelement, 1601 outputs is coupled, and control the 3rd beam split subelement 1613 the 3rd non-time-delay light signal of second beam split time-delay subelement, 1602 outputs is coupled; Select the light signal of output polarization beam splitting unit 14 outputs when described control unit 21 control switch units 15, then control the second beam split subelement 1612 the local oscillator light signal is coupled, and control the 3rd beam split subelement 1613 the local oscillator light signal is coupled.
The above-mentioned first phase delay subelement 1621, the second phase delay subelement 1622, third phase position postpone in subelement 1623 and the 4th phase delay subelement 1624, and phase delay is to determine the phase place of delay according to the sign indicating number type of the light signal that receives.For example, for the DQPSK signal, if the sign indicating number type of primary light signal I road and Q road signal is respectively 01,11,10 and 00, then I road and Q road signal are distinguished corresponding electric current I uAnd I vWith the signal n+1 moment and n phase difference constantly N+1nCorresponding relation as follows:
Figure BSA00000355495900071
Figure BSA00000355495900081
The electric field phase of receiver can be obtained according to above-mentioned corresponding relation, thereby the phase place that postpones can be determined.
The above-mentioned first beam split subelement 1611, the second beam split subelement 1612, the 3rd beam split subelement 1613 and the 4th beam split subelement 1614 are generally selected 2 * 2 coupler for use, wherein, the first beam split subelement 1611 and the 4th beam split subelement 1614 use one of them input, and another input is a spacing wave; An input of the second beam split subelement 1612 connects the second non-time delayed signal, and another input connects the local oscillator light signal, only closed one of them input during use, and another input also is a spacing wave; An input of the 3rd beam split subelement 1613 connects the 3rd non-time delayed signal, and another input connects the local oscillator light signal, only closed one of them input during use, and another input also is a spacing wave; The first coupling subelement 1631, the second coupling subelement 1632, the 3rd coupling subelement 1633 and the 4th coupling subelement 1634 can be 2 * 2 couplers.
The embodiment of the invention also provides a kind of method that realizes directly detection and coherent detection, as shown in Figure 3, comprising:
Step 31, the light signal that receives is divided into the first via light signal and the second road light signal;
Step 32, first via light signal carry out power division and obtain first light signal and second light signal, and the second road light signal carries out polarization beam splitting and obtains first light signal and second light signal;
Light signal after the control signal selection power output that step 33, basis receive is distributed or the light signal after the output polarization beam splitting;
Step 34, to output light signal directly detect or coherent detection.
Particularly,, then directly detect,, then carry out coherent detection if what select output according to the control signal that receives is light signal behind the polarization beam splitting if what select output according to the control signal that receives is light signal after the power division.
Further, described control signal is to be sent by the transmitting terminal of described light signal, or described control signal is by the receiving terminal of described light signal feedback, all right artificial selection control signal, concrete staff can select by the sign indicating number type of described light signal, for example, if described light signal is DPSK, then select the light signal after control signal control power output is distributed; If described light signal is PDM-QPSK, then select the light signal after control signal is controlled the output polarization beam splitting.
The transmitting terminal of light signal also can transmit control signal according to the sign indicating number type of light signal, for example, if the light signal that transmitting terminal sends is DPSK, then transmits control signal with the light signal after the distribution of control power output; If the light signal that transmitting terminal sends is PDM-QPSK, then transmit control signal with the light signal after the beam splitting of control output polarization.
Whether the receiving terminal of light signal can equate to come feedback control signal at the power of two polarization states by the light signal that detection receives, if equate, then is polarisation-multiplexed signal, the light signal after the beam splitting of feedback control signal control this moment output polarization; If unequal, then be single polarization signal, the light signal after feedback control signal control this moment power output is distributed.For example, if the light signal that receives is DPSK, the light signal after then feedback control signal is distributed with the control power output; If the light signal that receives is PDM-QPSK, the light signal of feedback control signal after then with the beam splitting of control output polarization.
Further, as shown in Figure 4, the light signal of output is directly detected or coherent detection can comprise:
Step 41, with after the power division or first light signal of exporting behind the polarization beam splitting carry out beam split and obtain the first non-time-delay light signal and the second non-time-delay light signal, and the first non-time-delay light signal employing adjustable delay line of inciting somebody to action wherein carries out delay process, the output first time-delay light signal and the second non-time-delay light signal;
Simultaneously, with after the power division or second light signal of exporting behind the polarization beam splitting carry out beam split and obtain the 3rd non-time-delay light signal and the 4th non-time-delay light signal, and the 4th non-time-delay light signal that will be wherein adopts the adjustable delay line to carry out delay process, exports the 3rd non-time-delay light signal and the 4th time-delay light signal.
Particularly, the adjustable delay line can specifically be determined the bit of time-delay according to the character rate of signal, the inverse that is the character rate of signal is the time-delay bit, it adopts time-delay adjustable, can adapt to different operating rates, avoid existing direct detecting method can only work in the situation of fixing speed.
Step 42, with described first the time-delay light signal be coupled, export first coupling optical signal and second coupling optical signal; Be coupled with the described second non-time-delay light signal or with the local oscillator light signal according to control signal, export the 3rd coupling optical signal and the 4th coupling optical signal; Be coupled with the described the 3rd non-time-delay light signal or with the local oscillator light signal according to control signal, export the 5th coupling optical signal and the 6th coupling optical signal; Described the 4th time-delay light signal is coupled, exports the 7th coupling optical signal and the 8th coupling optical signal.
Particularly, described control signal is to be sent by the transmitting terminal of described light signal, or described control signal is by the receiving terminal feedback of described light signal.The local oscillator light signal can be provided respectively by two lasers, also can be obtained by beam split by a laser, and the light signal when selecting according to control signal after power output is distributed then is coupled the second non-time-delay light signal and the 3rd non-time-delay light signal respectively; Light signal after selecting the output polarization beam splitting according to control signal then is coupled the local oscillator light signal respectively.
Step 43, described second coupling optical signal is carried out phase delay obtain the second phase delay light signal; Described the 4th coupling optical signal is carried out phase delay obtain the 4th phase delay light signal; Described the 6th coupling optical signal is carried out phase delay obtain the 6th phase delay light signal; Described the 8th coupling optical signal is carried out phase delay obtain the eight-phase delayed optical signal;
Particularly, phase delay is to determine the phase place of delay according to the sign indicating number type of the light signal that receives.For example, for the DQPSK signal, if the sign indicating number type of primary light signal I road and Q road signal is respectively 01,11,10 and 00, then I road and Q road signal are distinguished corresponding electric current I uAnd I vWith the signal n+1 moment and n phase difference constantly N+1nCorresponding relation as follows:
Figure BSA00000355495900101
The electric field phase of receiver can be obtained according to above-mentioned corresponding relation, thereby the phase place that postpones can be determined.
Step 44, with the back output that is coupled of described first coupling optical signal and described the 3rd coupling optical signal; With the back output that is coupled of the described second phase delay light signal and described the 4th phase delay light signal; With the back output that is coupled of described the 5th coupling optical signal and described the 7th coupling optical signal; With the back output that is coupled of described the 6th phase delay light signal and described eight-phase delayed optical signal.
Be that DQPSK is an example with the light signal that receives below, as shown in Figure 5, said method be specifically described in conjunction with the device of Fig. 6:
Step 51, receiving element 11 receive the DQPSK signal, and optical branching device 12 is divided into the first via light signal and the second road light signal with the light signal that receives, and first via light signal is sent into power distributing unit 13, and the second road light signal is sent into polarization beam-splitting unit 14.
Step 52, power distributing unit 13 are carried out power division with first via light signal and are exported first light signal and second light signal, and polarization beam-splitting unit 14 carries out polarization beam splitting with the second road light signal and exports first light signal and second light signal.
Step 53, select the light signal of power distributing unit 13 outputs according to control signal, control signal is sent by control unit 21.
First light signal that step 54, first beam split time-delay subelement 1601 will be exported carries out beam split and obtains light signal R (11) and R (12), second light signal that second beam split time-delay subelement 1602 will be exported carries out beam split and obtains light signal R (13) and R (14), and light signal R (11) that will be wherein and R (14) obtain light signal R (1) and R (4) after adopting the predetermined bit of adjustable delay line time-delay, and described predetermined bit can be definite according to the character rate of signal.
Step 55, send into the first beam split subelement 1611, the 4th beam split subelement 1614, the second beam split subelement 1612 and the 3rd beam split subelement 1613 respectively and be coupled according to light signal R (1) and R (4) and light signal R (12) and the R (13) of control signal after with delay process, obtain light signal r (1), r (2), r (3), r (4), r (5), r (6), r (7) and r (8), at this moment the switch closure on control unit 21 control R (12) and R (13) the place circuit.
Step 56, light signal r (2), r (4), r (6) and r (8) that coupling is obtained send into the first phase delay subelement 1621, the second phase delay subelement 1622 respectively, the third phase position postpones subelement 1623 and the 4th phase delay subelement 1624 carries out phase delay, obtains light signal X (2), X (4), X (6) and X (8).
Concrete, the first phase delay subelement 1621, the second phase delay subelement 1622, third phase position delay subelement 1623 and the 4th phase delay subelement 1624 are determined the phase place of delay according to the sign indicating number type of the light signal that receives, be specially first phase delay cell phase retardation-π/4, second phase delay cell phase retardation π/4, third phase position delay units delay phase place 0, the four phase delay cell phase retardation-3 π/4.
Step 57, light signal r (1) and r (3), X (2) are respectively sent into first coupling subelement 1631, second coupling subelement 1632, three coupling subelement 1633 and four coupling subelement 1634 with r (7) and X (6) with X (8) with X (4), r (5) be coupled, choose the signal that light signal x (2) after the coupling and x (4) output are correct reception, other light signal can be ignored.
In like manner, if the light signal that receives is DPSK, its step and step 51 are basic identical to step 56, and light signal x (1), x (2), x (3) and x (4) that step 57 item is chosen after the coupling export the signal that is correct reception.
Be that PDM-QPSK is an example with the light signal that receives below, as shown in Figure 7, said method be specifically described in conjunction with the device of Fig. 8:
Step 71, receiving element 11 receive the PDM-QPSK signal, and optical branching device 12 is divided into the first via light signal and the second road light signal with the light signal that receives, and first via light signal is sent into power distributing unit 13, and the second road light signal is sent into polarization beam-splitting unit 14.
Step 72, power distributing unit 13 are carried out power division with first via light signal and are exported first light signal and second light signal, and polarization beam-splitting unit 14 carries out polarization beam splitting with the second road light signal and exports first light signal and second light signal.
Step 73, select the light signal of polarization beam-splitting unit 14 outputs according to control signal, control signal is sent by control unit 21.
Step 74, first light signal that first beam split time-delay subelement 1601 will be exported carries out beam split and obtains light signal F (11) and F (12), second light signal that second beam split time-delay subelement 1602 will be exported carries out beam split and obtains light signal F (13) and F (14), and light signal F (11) that will be wherein and F (14) adopt the time-delay of adjustable delay line to be scheduled to bit after obtain light signal F (1) and F (4), described predetermined bit can be determined according to the character rate of signal, because the bit number for time-delay under the coherent detection does not require, so all time-delay is that 0 bit is also passable, as long as guarantee the identical bit number of light signal time-delay of two-way delay process.
Step 75, according to control signal after with delay process light signal F (1) and F (4) and local oscillation signal F (5) and F (6) the first beam split subelement 1611, the 4th beam split subelement 1614, the second beam split subelement 1612 and the 3rd beam split subelement 1613 are coupled respectively, obtain light signal f (1), f (2), f (3), f (4), f (5), f (6), f (7) and f (8), at this moment the switch closure on the circuit at control unit 21 control local oscillation signal places.
Step 76, light signal f (2), the f (6), f (4) and the f (8) that obtain after will being coupled send into the first phase delay subelement 1621, the second phase delay subelement 1622 respectively, the third phase position postpones subelement 1623 and the 4th phase delay subelement 1624 carries out phase delay, obtains light signal Z (2), Z (4), Z (6) and Z (8).
Particularly, the first phase delay subelement 1621, the second phase delay subelement 1622, third phase position delay subelement 1623 and the 4th phase delay subelement 1624 are determined the phase place of delay according to the sign indicating number type of the light signal that receives, be specially first phase delay cell and third phase position delay units delay phase place 0, the second phase delay cell and the 4th phase delay cell phase retardation pi/2.
Step 77, light signal f (1) and f (3), Z (2) are respectively sent into first coupling subelement 1631, second coupling subelement 1632, three coupling subelement 1633 and four coupling subelement 1634 with f (7) and Z (6) with Z (8) with Z (4), f (5) be coupled, light signal z (1), the z (2), z (3) and the z (4) that choose after the coupling export the signal that is correct reception.
The embodiment of the invention is selected light signal is carried out power division or polarization beam splitting according to control signal, promptly select the light signal of power output allocation units output or the light signal of output polarization beam splitting unit output by switch unit, promptly can finish the selection of direct detection or coherent detection according to control signal, thereby directly detect or coherent detection, realized the light signal of different sign indicating number types is carried out demodulation.Beam split delay unit group adopts the adjustable delay line to carry out delay process, and specifically according to the definite bit of delaying time of the character rate of signal, reached the purpose that to regulate according to operating rate, because time-delay is adjustable, so can adapt to different operating rates, solved in the existing direct detecting method, the amount of delay of receiver is fixed, and can only work in the problem of fixing speed.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (13)

1. a device of realizing directly detection and coherent detection is characterized in that, comprising:
Receiving element is used for receiving optical signals;
Optical branching device is used for the light signal that receiving element receives is divided into the first via light signal and the second road light signal, and first via light signal is sent into power distributing unit, and the second road light signal is sent into polarization beam-splitting unit;
Power distributing unit is used for that first via light signal is carried out power division and exports first light signal and second light signal;
Polarization beam-splitting unit is used for that the second road light signal is carried out polarization beam splitting and exports first light signal and second light signal;
Switch unit is used for selecting the light signal of power distributing unit output or the light signal of polarization beam-splitting unit output according to the control signal that receives;
Detecting unit is used for the light signal of switch unit output is directly detected or coherent detection.
2. device according to claim 1 is characterized in that, also comprises:
Control unit is used to receive the control signal by the transmitting terminal transmission of described light signal, and described control signal is sent to switch unit; Or be used to receive the control signal of feeding back by receiving element, and described control signal is sent to switch unit.
3. device according to claim 2 is characterized in that, described detecting unit comprises:
First beam split time-delay subelement, be used for that first light signal that switch unit is exported is carried out beam split and obtain the first non-time-delay light signal and the second non-time-delay light signal, and the first non-time-delay light signal employing adjustable delay line of inciting somebody to action wherein carries out delay process, the output first time-delay light signal and the second non-time-delay light signal;
Second beam split time-delay subelement, be used for that second light signal that switch unit is exported is carried out beam split and obtain the 3rd non-time-delay light signal and the 4th non-time-delay light signal, and the 4th non-time-delay light signal that will be wherein adopts the adjustable delay line to carry out delay process, exports the 3rd non-time-delay light signal and the 4th time-delay light signal.
4. device according to claim 3 is characterized in that, described control unit also is used to receive the control signal by the transmitting terminal transmission of described light signal, and described control signal is sent to the second beam split subelement and the 3rd beam split subelement; Or be used to receive the control signal of feeding back by receiving element, and described control signal is sent to the second beam split subelement and the 3rd beam split subelement.
5. device according to claim 4 is characterized in that, described detecting unit also comprises:
The first beam split subelement is used for the first time-delay light signal of first beam split time-delay subelement output is coupled, and exports first coupling optical signal and second coupling optical signal;
The second beam split subelement is used for being coupled with the second non-time-delay light signal of first beam split time-delay subelement output or with the local oscillator light signal according to described control signal, exports the 3rd coupling optical signal and the 4th coupling optical signal;
The 3rd beam split subelement is used for being coupled with the 3rd non-time-delay light signal of second beam split time-delay subelement output or with the local oscillator light signal according to described control signal, exports the 5th coupling optical signal and the 6th coupling optical signal;
The 4th beam split subelement is used for the 4th time-delay light signal of second beam split time-delay subelement output is coupled, and exports the 7th coupling optical signal and the 8th coupling optical signal.
6. device according to claim 5, it is characterized in that, the described second beam split subelement, be used for if described switch unit is selected the light signal of power distributing unit output, then be coupled, export the 3rd coupling optical signal and the 4th coupling optical signal according to the second non-time-delay light signal of described control signal with the output of first beam split time-delay subelement; If described switch unit is selected the light signal of polarization beam-splitting unit output, then the local oscillator light signal is coupled according to described control signal, export the 3rd coupling optical signal and the 4th coupling optical signal;
Described the 3rd beam split subelement, be used for if described switch unit is selected the light signal of power distributing unit output, then be coupled, export the 5th coupling optical signal and the 6th coupling optical signal according to the 3rd non-time-delay light signal of described control signal with the output of second beam split time-delay subelement; If described switch unit is selected the light signal of polarization beam-splitting unit output, then the local oscillator light signal is coupled according to described control signal, export the 5th coupling optical signal and the 6th coupling optical signal.
7. device according to claim 5 is characterized in that, described detecting unit also comprises:
The first phase delay subelement is used for that second coupling optical signal that the first beam split subelement is exported is carried out phase delay and obtains the second phase delay light signal;
The second phase delay subelement is used for that the 4th coupling optical signal that the second beam split subelement is exported is carried out phase delay and obtains the 4th phase delay light signal;
The third phase position postpones subelement, is used for that the 6th coupling optical signal that the 3rd beam split subelement is exported is carried out phase delay and obtains the 6th phase delay light signal;
The 4th phase delay subelement is used for that the 8th coupling optical signal that the 4th beam split subelement is exported is carried out phase delay and obtains the eight-phase delayed optical signal.
8. device according to claim 7 is characterized in that, described detecting unit also comprises:
The first coupling output subelement is used for the 3rd coupling optical signal with first coupling optical signal of first beam split subelement output and the output of the second beam split subelement back that is coupled and exports;
The second coupling output subelement is used for the 4th phase delay light signal with the second phase delay light signal of first phase delay subelement output and the output of the second phase delay subelement back that is coupled and exports;
The 3rd coupling output subelement is used for the 7th coupling optical signal with the 5th coupling optical signal of the 3rd beam split subelement output and the output of the 4th beam split subelement back that is coupled and exports;
Export the 4th coupling output subelement, the 6th phase delay light signal that is used for the third phase position is postponed subelement output and the eight-phase delayed optical signal of the 4th phase delay subelement output back that is coupled.
9. a method that realizes directly detection and coherent detection is characterized in that, comprising:
The light signal that receives is divided into the first via light signal and the second road light signal;
The first via is carried out power division and is obtained first light signal and second light signal, and the second road light signal carries out polarization beam splitting and obtains first light signal and second light signal;
According to light signal after the control signal selection power output distribution that receives or the light signal after the output polarization beam splitting;
Light signal to output directly detects or coherent detection.
10. method according to claim 9 is characterized in that, also comprises:
Described control signal is to be sent by the transmitting terminal of described light signal;
Or described control signal is by the receiving terminal of described light signal feedback.
11. method according to claim 10 is characterized in that, described light signal to output directly detects or coherent detection comprises:
With after the power division or first light signal of exporting behind the polarization beam splitting carry out beam split and obtain the first non-time-delay light signal and the second non-time-delay light signal, and the first non-time-delay light signal employing adjustable delay line of inciting somebody to action wherein carries out delay process, the output first time-delay light signal and the second non-time-delay light signal;
With after the power division or second light signal of exporting behind the polarization beam splitting carry out beam split and obtain the 3rd non-time-delay light signal and the 4th non-time-delay light signal, and the 4th non-time-delay light signal that will be wherein adopts the adjustable delay line to carry out delay process, exports the 3rd non-time-delay light signal and the 4th time-delay light signal.
12. method according to claim 11 is characterized in that, described light signal to output directly detects or coherent detection comprises:
The described first time-delay light signal is coupled, exports first coupling optical signal and second coupling optical signal; Be coupled with the described second non-time-delay light signal or with the local oscillator light signal according to control signal, export the 3rd coupling optical signal and the 4th coupling optical signal; Be coupled with the described the 3rd non-time-delay light signal or with the local oscillator light signal according to control signal, export the 5th coupling optical signal and the 6th coupling optical signal; Described the 4th time-delay light signal is coupled, exports the 7th coupling optical signal and the 8th coupling optical signal;
Described second coupling optical signal is carried out phase delay obtain the second phase delay light signal; Described the 4th coupling optical signal is carried out phase delay obtain the 4th phase delay light signal; Described the 6th coupling optical signal is carried out phase delay obtain the 6th phase delay light signal; Described the 8th coupling optical signal is carried out phase delay obtain the eight-phase delayed optical signal;
With the back output that is coupled of described first coupling optical signal and described the 3rd coupling optical signal; With the back output that is coupled of the described second phase delay light signal and described the 4th phase delay light signal; With the back output that is coupled of described the 5th coupling optical signal and described the 7th coupling optical signal; With the back output that is coupled of described the 6th phase delay light signal and described eight-phase delayed optical signal.
13. method according to claim 12 is characterized in that, describedly is coupled with the described second non-time-delay light signal or with the local oscillator light signal according to control signal, exports the 3rd coupling optical signal and the 4th coupling optical signal; Be coupled with the described the 3rd non-time-delay light signal or with the local oscillator light signal according to control signal, export the 5th coupling optical signal and the 6th coupling optical signal, specifically comprise:
If the control signal that described basis receives is selected the light signal after power output is distributed, then the described second non-time-delay light signal is coupled according to control signal, export the 3rd coupling optical signal and the 4th coupling optical signal; If the control signal that described basis receives is selected the light signal after the output polarization beam splitting, then described local oscillator light signal is coupled according to control signal, export the 3rd coupling optical signal and the 4th coupling optical signal;
If the control signal that described basis receives is selected the light signal after power output is distributed, then the described the 3rd non-time-delay light signal is coupled according to control signal, export the 5th coupling optical signal and the 6th coupling optical signal; If the control signal that described basis receives is selected the light signal after the output polarization beam splitting, then described local oscillator light signal is coupled according to control signal, export the 5th coupling optical signal and the 6th coupling optical signal.
CN201010554150.9A 2010-11-19 2010-11-19 Method and device for realizing direct detection and coherent detection Expired - Fee Related CN102142902B (en)

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