CN101436906A - Apparatus and method for optimizing differential phase-shift-keyed optic transmission system - Google Patents
Apparatus and method for optimizing differential phase-shift-keyed optic transmission system Download PDFInfo
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Abstract
The invention provides a device for optimizing a differential phase shift keying (DPSK) optical transmission system, which comprises a delay interferometer, a balanced receiver and a clock data restoration unit, wherein the delay interferometer is used for dividing a differential phase shift keying signal into two paths of sub-signals to perform interference, the differential phase shift keying signal is demodulated into two paths of optical signals after the interference of the delay interferometer, the optical signals are output to the balanced receiver, and the delay time of one path of the differential phase shift keying signal is adjustable; the balanced receiver is used for receiving the optical signals from the delay interferometer and performing photoelectric conversion and differential amplification on the optical signals so as to provide the generated electric signals for the clock data restoration unit; and the clock data restoration unit is used for receiving the electric signals from the balanced receiver so as to perform clock synchronization and data judgment on the electric signals to restore original data. The invention also provides a method for optimizing the differential phase shift keying optical transmission system. Therefore, the dispersion tolerance of the DPSK system is improved to a certain degree, and the DPSK system can bear the influence of the filtering of a narrowband photosynthetic wave separator.
Description
Technical field
The present invention relates to a kind of device of optimizing differential phase-shift-keyed optic transmission system.
Background technology
Along with the jumbo growth of communication service, two-forty, jumbo long Distance Transmission technology become the focus of the research of optical fiber communication in recent years.For improving the availability of frequency spectrum, reducing cost, narrow passage interval D WDM network will more and more be used.Differential phase keying (DPSK) (DPSK) has the raising of 3dB receiver sensitivity, superior advantages such as non-linear behaviour than non-return-to-zero (NRZ) modulation format.
In the DPSK modulation, data message is modulated on the phase difference of light carrier adjacent bit, and MZDI (Mach-ZehnderDelay Interferometer) demodulator that postpones 1 bit commonly used carries out demodulation before directly intensity detection receives.For making the light signal As soon as possible Promising Policy interference condition of two arms, need control the delay and the phase place of demodulator usually, therefore, the device that patent [CN1798121A] discloses a kind of FEEDBACK CONTROL MZDI time of delay is as shown in Figure 1.It comprises interferometer structure (3), and this interferometer structure has input port (1), the output port (8) of the light signal that is used for receiving the DPSK modulation and first and second arms (4,5) that extend to described output port (8) from described input port (1); The adjusting device (5,7,14,16) that is used for fine setting described two arms (4,5) delay-time difference in comprising the scope of T; Be connected to the light/electric transducer (10) of the output port (8) of interferometer structure (3); And the band pass filter (12) that is connected to the output of light/electric transducer (10), its passband does not comprise 1/T (T is a bit period).Described adjusting device (5,7,14,16) is suitable for adjusting time of delay according to the output power levels of band pass filter (12).
Above-mentioned demodulator can realize stably postponing the purpose of 1 bit time time of delay by fine setting MZDI, solve optical signal frequency and be offset the problem of bringing the eye opening cost, but in dwdm system, if the bandwidth of channel join-splitting device is narrower, MZDI postpones 1 bit can introduce significant intersymbol interference, thereby make DPSK be applied in the narrow channel spacing system bigger cost is arranged.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, main purpose of the present invention is, a kind of device of optimizing differential phase-shift-keyed optic transmission system is provided, and it comprises:
Delay interferometer is used for that the differential phase keying (DPSK) signal is divided into the two-way subsignal and interferes, and wherein the time of delay of a way signal is adjustable.Be demodulated into two ways of optical signals after the delayed interferometer of signal is interfered, and light signal is outputed to balanced reciver;
Balanced reciver is used to receive the light signal from delay interferometer, and light signal is carried out after opto-electronic conversion and the difference amplification signal of telecommunication that generates being offered the clock and data recovery unit; And
The clock and data recovery unit is used to receive the signal of telecommunication from balanced reciver, the signal of telecommunication is carried out clock synchronization and data decision recovers initial data.
Delay interferometer can comprise: beam splitter is used for the differential phase keying (DPSK) signal is divided into the two-way subsignal; The adjustable delay module is used for making the road generation delay of being carried out the subsignal of beam splitting by beam splitter; And coupler, be used for interfering, and will interfere the two ways of optical signals of back generation to output to balanced reciver to the subsignal of delay with by another way signal of beam splitter output, wherein, two ways of optical signals is respectively the long mutually and signal cancellation of signal.
The adjustable delay module can be configured the time of delay that changes a road in the subsignal at different systems.
Can be arranged on time of delay greater than 0 to scope less than 2T.
Balance receiver can comprise: two optical-electrical converters, and being used in the future, the two ways of optical signals of self-dalay interferometer is converted to two path signal; And differential amplifier, be used for that two path signal is carried out difference and amplify.
The device of optimizing differential phase-shift-keyed optic transmission system can also comprise: error code detection module is used to receive from the signal of clock and data recovery unit detecting the error rate of the signal that is received, and the error rate is outputed to feedback control unit; And feedback control unit, be used to receive the error rate from error code detection module, and according to the adjustable delay module of error rate control lag interferometer, to regulate the delay of a road in the subsignal.
According to a further aspect of the invention, provide a kind of method of optimizing differential phase-shift-keyed optic transmission system, it comprises:
Step S202, time of delay of delay interferometer is set to first scheduled delay and feedback control unit is set to initial condition, finely tune at the first scheduled delay place so that error code detection module in the detected error rate minimum in the first scheduled delay place, and with first time of delay place minimum bit-error rate as first state storage to feedback control unit;
Step S204, differ change into the time of delay of delay interferometer from second scheduled delay of particular value with first scheduled delay and finely tune at the second scheduled delay place, so that error code detection module locates to detect error rate minimum in second time of delay, and the minimum bit-error rate that locate second time of delay is arrived feedback control unit as second state storage; And
Step S206, feedback control unit compares first state and second state, and carries out respective handling according to comparative result.
The method of optimizing differential phase-shift-keyed optic transmission system can also comprise:
If first state is greater than second state, then in feedback control unit, second state is saved as first state, and on identical change direction, second scheduled delay of delay interferometer is changed particular value, otherwise, if first state is less than second state, then preserve first state, and on opposite change direction, first scheduled delay of delay interferometer is changed particular value; And
Repeated execution of steps S204 and step S206, until occurring first state once more less than second state, be the optimal delay time of differential phase keying (DPSK) system the first state pairing time of delay when determining to occur first state less than second state once more.
By technique scheme, make the dispersion tolerance of DPSK system be improved to some extent, the influence of narrow band light channel join-splitting device filtering more can be born by the DPSK system.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 shows the known schematic diagram that passes through the DPSK demodulating equipment of FEEDBACK CONTROL fine setting MZDI time of delay;
Fig. 2 shows the schematic representation of apparatus according to optimization differential phase-shift-keyed optic transmission system of the present invention;
Fig. 3 shows the flow chart according to the method for optimization differential phase-shift-keyed optic transmission system of the present invention;
Fig. 4 shows an embodiment according to the device of optimization differential phase-shift-keyed optic transmission system of the present invention, wherein, uses adjustable delay MZDI demodulation dpsk signal;
Fig. 5 shows the flow chart according to an embodiment of the method for optimization differential phase-shift-keyed optic transmission system of the present invention;
Fig. 6 a, Fig. 6 b, Fig. 6 c-1, Fig. 6 c-2, Fig. 6 c-3, Fig. 6 d-1, Fig. 6 d-2 and Fig. 6 d-3 show respectively system works under narrow-band optical filter adjustable delay MZDI demodulator time of delay asynchronous signal eye diagram; And
Fig. 7 shows that dispersion tolerance is with the MZDI variation of time of delay under the different optical filter bandwidth, and wherein, optical filter bandwidth is 37.5GHz and 75GHz.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 2 shows the schematic representation of apparatus according to optimization differential phase-shift-keyed optic transmission system of the present invention.
With reference to Fig. 2, a kind of device of optimizing differential phase-shift-keyed optic transmission system is provided, it comprises:
Balanced reciver 20 is used to receive the light signal from delay interferometer 10, and light signal is carried out after opto-electronic conversion and the difference amplification signal of telecommunication that generates being offered clock and data recovery unit 30; And
Clock and data recovery unit 30 is used to receive the signal of telecommunication from balanced reciver 20, the signal of telecommunication is carried out clock synchronization and data decision recovers initial data.
Can be arranged on time of delay greater than 0 to scope less than 2T.
The device of optimizing differential phase-shift-keyed optic transmission system can also comprise: error code detection module is used to receive from the signal of clock and data recovery unit detecting the error rate of the signal that is received, and the error rate is outputed to feedback control unit; And feedback control unit, be used to receive the error rate from error code detection module, and according to the adjustable delay module of error rate control lag interferometer, to regulate the delay of a road in the subsignal.
Fig. 3 shows the flow chart according to the method for optimization differential phase-shift-keyed optic transmission system of the present invention.
With reference to Fig. 3, a kind of method of optimizing differential phase-shift-keyed optic transmission system is provided, it comprises:
Step S202, time of delay of delay interferometer is set to first scheduled delay and feedback control unit is set to initial condition, finely tune at the first scheduled delay place so that error code detection module in the detected error rate minimum in the first scheduled delay place, and with first time of delay place minimum bit-error rate as first state storage to feedback control unit;
Step S204, differ change into the time of delay of delay interferometer from second scheduled delay of particular value with first scheduled delay and finely tune at the second scheduled delay place, so that error code detection module locates to detect error rate minimum in second time of delay, and the minimum bit-error rate that locate second time of delay is arrived feedback control unit as second state storage; And
Step S206, feedback control unit compares first state and second state, and carries out respective handling according to comparative result.
The method of optimizing differential phase-shift-keyed optic transmission system can also comprise:
If first state is greater than second state, then in feedback control unit, second state is saved as first state, and on identical change direction, second scheduled delay of delay interferometer is changed particular value, otherwise, if first state is less than second state, then preserve first state, and on opposite change direction, first scheduled delay of delay interferometer is changed particular value; And
Repeated execution of steps S204 and step S206, until occurring first state once more less than second state, be the optimal delay time of differential phase keying (DPSK) system the first state pairing time of delay when determining to occur first state less than second state once more.
First scheduled delay is 1.0T.
Particular value is 0.1T.
Below the preferred embodiment of present invention will be described in detail with reference to the accompanying apparatus and method.
Fig. 4 passes through illustrative and nonrestrictive example, has shown a preferred embodiment of apparatus of the present invention: realize DPSK optical transmission system optimization in Properties with FEEDBACK CONTROL adjustable delay MZDI (Mach-Zehnder DelayInterferometer) demodulator.Its device comprises: delay interferometer 10, be used for the dpsk signal of input is carried out demodulation, and wherein one tunnel delay adjustable (12), 10 two-way output are respectively the long mutually and signal cancellation of signal; Balanced reciver 20 is used for the two ways of optical signals of delay interferometer 10 outputs is carried out opto-electronic conversion and difference amplification, thus the signal of telecommunication that obtains amplifying; Clock and data recovery unit 30 is used for the signal of balanced reciver 20 outputs is carried out clock synchronization and data decision, thereby recovers initial data; Error code detection module 40 is used to monitor the error rate that receives data; Feedback control unit 50 is used to read the error rate of error code detection module 40 and regulates the time of delay of adjustable delay module 12 automatically according to error condition, makes systematic function reach best.
Three major parts that delay interferometer 10 comprises are: beam splitter (50:50) 11 is used for the dpsk signal of input is divided into two-way; Adjustable delay module 12 is used for one road dpsk signal is produced certain delay, and regulate its time of delay in 0.4T-1.1T (T is a bit period, down together); 2 * 2 output coupling (50:50) 13 are used for that two-way is had the dpsk signal that postpones difference and interfere, and export the long mutually and signal cancellation light signal of signal after interfering.
Fig. 5 has shown the preferred embodiment that the inventive method realizes with installation drawing 3 by a flow chart, its concrete operations step is as follows: 1. put MZDI10 and feedback control unit 50 and be initial condition, be 1.0T the time of delay that makes MZDI, and fine setting (trimming precision 0.00001T) makes error rate minimum, and the error rate of feedback control unit 50 stored this moments and time of delay are as state 1; 2. changing 0.1T (for example reducing 0.1T) time of delay of MZDI10, and near this time of delay, finely tune, obtain the best error rate under this time of delay, this error rate and this time of delay are deposited in feedback control unit 50 as state 2; 3. the error rate to state 1 and state 2 compares in feedback control unit 50, determine to change the direction of time of delay with the little state of the error rate: if the error rate of state 2 is good next time, just continue the last direction (for example continuing to reduce) that changes time of delay and change 0.1T, and previous status 2 is saved as state 1; If the error code rate variance of state 2 then changes 0.1T, the attitude 1 of remaining stationary according to changing opposite direction time of delay (for example increasing) with the last time; 4. near the time of delay that step 3 obtains, finely tune, obtain the best error rate under this time of delay, this error rate and time of delay as state 2.5. repeating step 3 and 4, the direction that changes up to time of delay occurs repeatedly, then stops, and be exactly system's best configuration the time of delay of state 1 correspondence of this moment.
When system works in narrow band light channel join-splitting device following time, the dpsk signal of input is because the effect of narrow-band optical filter can produce significant intersymbol interference.If be 1 bit the time of delay of MZDI demodulator 10, significantly the signal of distortion is interfered with the opening width of balance reception back output eye pattern relatively poor.If but arrived certain optimum value the time of delay of regulating MZDI demodulator 10 less than 1 bit, the eye opening of receiver output signal could have significant improvement.The 40Gb/s wdm system is operated under the 37.5GHz optical filter bandwidth, and when be respectively 1 bit and 0.7 bit the time of delay of MZDI demodulator 10, the eye pattern of S0, S1, S2, S3 signal as shown in Figure 6 among Fig. 4.Wherein, Fig. 6 a shows the dpsk signal of transmitter output, Fig. 6 b shows the S0 signal of input MZDI behind the 37.5GHz optical filter, Fig. 6 c-1 shows the S1 signal that MZDI postpones 1 bit, Fig. 6 c-2 shows the S2 signal that MZDI postpones 1 bit, and Fig. 6 c-3 shows the S3 signal that MZDI postpones 1 bit, and Fig. 6 d-1 shows the S1 signal that MZDI postpones 0.7 bit, Fig. 6 d-2 shows the S2 signal that MZDI postpones 0.7 bit, and Fig. 6 d-3 shows the S3 signal that MZDI postpones 0.7 bit.S0 is the signal that enters MZDI demodulator 10, and the dpsk signal that the contrast transmitter sends can be clear that very big distortion has taken place the S0 of process narrow-band filtering; S3 is the signal of balanced reciver 20 output, when contrast postpones 1 bit and 0.7 bit the eye pattern of S3 as can be known, the eye opening when postponing 0.7 bit is significantly improved than the eye opening that postpones 1 bit.Fig. 7 be under the different optical filter bandwidth (37.5GHz and 75GHz) dispersion tolerance with the MZDI variation of time of delay.As can be seen from the figure, along with reducing of MZDI time of delay, dispersion tolerance all is improved to some extent under these two kinds of optical filter bandwidth.
Though show and the application of institute of the present invention extracting method and the realization of device be described with reference to the preferred embodiments of the present invention, but it should be appreciated by those skilled in the art, the realization of delay interferometer 10 is not limited to the MZDI among the embodiment, can also be Michelson steller interferometer etc., come the demodulation dpsk signal by delayed interference as long as satisfy; The realization of adjustable delay also is not limited to pure optical fiber, planar lightwave circuit, waveguide or the free space light path etc. used always; The control of regulating both can be manual, also can realize with feedback control unit; The monitoring variable of FEEDBACK CONTROL both can be the error rate, also can be output voltage of balanced reciver etc., and the design of FEEDBACK CONTROL and operating procedure also are diversified.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a device of optimizing differential phase-shift-keyed optic transmission system is characterized in that, comprising:
Delay interferometer, being used for that the differential phase keying (DPSK) signal is divided into the two-way subsignal interferes, described differential phase keying (DPSK) signal is demodulated into two ways of optical signals after described delay interferometer is interfered, and described light signal outputed to balanced reciver, wherein, the time of delay of a road in the described two-way subsignal is adjustable;
Described balanced reciver is used to receive the described light signal from described delay interferometer, and the described signal of telecommunication that described light signal is carried out will generating after opto-electronic conversion and the difference amplification offers the clock and data recovery unit; And
Described clock and data recovery unit is used to receive the described signal of telecommunication from described balanced reciver, the described signal of telecommunication is carried out clock synchronization and data decision recovers initial data.
2. the device of optimization differential phase-shift-keyed optic transmission system according to claim 1 is characterized in that, described delay interferometer comprises:
Beam splitter is used for described differential phase keying (DPSK) signal is divided into the two-way subsignal;
The adjustable delay module is used for making the road generation delay of being carried out the described subsignal of beam splitting by described beam splitter; And
Coupler, be used for interfering to the described subsignal of delay with by the described subsignal in another road of described beam splitter output, and will interfere the described light signal of two-way of back generation to output to described balanced reciver, wherein, the described light signal of two-way is respectively the long mutually and signal cancellation of signal.
3. the device of optimization differential phase-shift-keyed optic transmission system according to claim 2 is characterized in that, described adjustable delay module is configured the time of delay that changes a road in the described subsignal at different systems.
4. the device of optimization differential phase-shift-keyed optic transmission system according to claim 3 is characterized in that, described time of delay greater than 0 to scope less than 2T.
5. the device of optimization differential phase-shift-keyed optic transmission system according to claim 1 is characterized in that, described balance receiver comprises:
Two optical-electrical converters are used for and will be converted to two path signal from the described light signal of the two-way of described delay interferometer; And
Differential amplifier is used for that the described signal of telecommunication of two-way is carried out difference and amplifies.
6. the device of optimization differential phase-shift-keyed optic transmission system according to claim 1 is characterized in that, also comprises:
Error code detection module is used to receive from the signal of described clock and data recovery unit detecting the error rate of the signal that is received, and the described error rate is outputed to feedback control unit; And
Feedback control unit is used to receive the described error rate from described error code detection module, and regulates the described adjustable delay module of described delay interferometer according to the described error rate, to regulate the delay of a road in the described subsignal.
7. the device of each described optimization differential phase-shift-keyed optic transmission system was optimized the method for differential phase-shift-keyed optic transmission system during a use required according to aforesaid right, it is characterized in that, comprising:
Step S202, time of delay of delay interferometer is set to first scheduled delay and feedback control unit is set to initial condition, finely tune at the described first scheduled delay place so that error code detection module in the detected error rate minimum in the described first scheduled delay place, and with described first time of delay place minimum bit-error rate as first state storage to described feedback control unit;
Step S204, differ change into the time of delay of described delay interferometer from second scheduled delay of particular value with described first scheduled delay and finely tune at the described second scheduled delay place, so that described error code detection module locates to detect described error rate minimum in described second time of delay, and the minimum bit-error rate that locate described second time of delay is arrived described feedback control unit as second state storage; And
Step S206, described feedback control unit compares described first state and described second state, and carries out respective handling according to comparative result.
8. the method for optimization differential phase-shift-keyed optic transmission system according to claim 7 is characterized in that, also comprises:
If described first state is greater than described second state, then in described feedback control unit, described second state is saved as described first state, and on identical change direction, described second scheduled delay of described delay interferometer is changed described particular value, otherwise, if described first state is less than described second state, then preserve described first state, and on opposite change direction, described first scheduled delay of described delay interferometer is changed described particular value; And
Repeat described step S204 and described step S206, until occurring described first state once more less than described second state, described first state when determining to occur once more described first state less than described second state is the optimal delay time of described differential phase keying (DPSK) system pairing described time of delay.
9. the method for optimization differential phase-shift-keyed optic transmission system according to claim 8 is characterized in that, described first scheduled delay is 1.0T.
10. the method for optimization differential phase-shift-keyed optic transmission system according to claim 8 is characterized in that, described particular value is 0.1T.
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| CN102025440A (en) * | 2010-12-20 | 2011-04-20 | 中兴通讯股份有限公司 | Method and system for scanning GFEC (Generic Forward Error Correction) blind area in 100G system |
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| CN102025440A (en) * | 2010-12-20 | 2011-04-20 | 中兴通讯股份有限公司 | Method and system for scanning GFEC (Generic Forward Error Correction) blind area in 100G system |
| CN102025440B (en) * | 2010-12-20 | 2015-01-28 | 中兴通讯股份有限公司 | Method and system for scanning GFEC (Generic Forward Error Correction) blind area in 100G system |
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