CN102045109A - Optical fiber link online dispersion measuring device - Google Patents
Optical fiber link online dispersion measuring device Download PDFInfo
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Abstract
The invention discloses an optical fiber link online dispersion measuring device, comprising an optical domain frequency spectrum processing unit, a photoelectric conversion unit, a mixing unit and a signal processing unit, wherein the optical domain frequency spectrum processing unit is used for filtering and modulating an optical signal input by an optical fiber link and inputting two optical signals the upper and lower sideband spectrum of which are respectively designated to the photoelectric conversion unit; the photoelectric conversion unit is used for detecting the two optical signals output by the optical domain frequency spectrum processing unit, converting the two optical signals into two electric domain signals and outputting the two electric domain signals to the mixing unit; the mixing unit is used for mixing the two optical signal output by the photoelectric conversion unit and outputting the electric signal after mixing to the signal processing unit; and the signal processing unit is used for receiving a signal output by the mixing unit and carrying out analog-digital conversion on the signal and arithmetic processing on the signal after analog-digital conversion, so as to calculate optical fiber link dispersion value.
Description
Technical field
The present invention relates to be used for the device of real-time measuring light transmission system and dwdm system link dispersion (CD), this chromatic dispersion measurement device is particularly useful in the backbone network transmission system.
Background technology
At present at the research of the online chromatic dispersion measurement of optical transmission system, this field scholar does a lot of work a series of online chromatic dispersion measurement scheme that proposed according to its operator scheme, can be divided into double-end measurement and two kinds of patterns of single-ended measurement substantially.
Online chromatic dispersion measurement both-end pattern promptly is to make relevant configuration to transmission equipment or to add the measured signal of certain form at the data transmission end of transmission system, and derives the transmission link dispersion measure at receiving terminal by a certain characteristic quantity that extracts corresponding signal.The online chromatic dispersion measurement method of the both-end pattern that has now proposed has based on the RF spectrum analytic approach of frequency domain with based on two kinds of the pulse group velocity delay inequality probe methods of time domain.Based on the online chromatic dispersion measurement of the RF spectrum analytic approach of frequency domain, this class methods weak point is and need makes relevant configuration to the data transmitting terminal that this operation bring damage can for the communication quality of link, causes signal transmission quality to worsen, and the receiving terminal error rate is increased; Online chromatic dispersion measurement based on the pulse group velocity delay inequality probe method of time domain, this scheme need adopt photodetector at a high speed, high-sensitive RF power detector and other high speed subsidiary equipment, and require transmitting terminal and receiving terminal to possess strict clock synchronization, the system cost height, precision exists than great fluctuation process, is not suitable for the real-time monitoring of long-distance optical fiber link chromatic dispersion.
Online chromatic dispersion measurement single-ended mode promptly is need not do relevant configuration at transmitting terminal, only a bit realizes the link dispersion monitoring function in certain of optical transmission chain.The online chromatic dispersion measurement scheme of the single-ended mode that has now proposed has two kinds of the RF spectrum analytic approachs surveyed based on the online chromatic dispersion monitor of time domain asynchronous-sampling method with based on phase sensitive.Online chromatic dispersion monitor based on time domain asynchronous-sampling method, these class methods need adopt photoelectric device at a high speed, as device or equipment such as light velocity photodetector, high-speed AD converter, high speed signal analyzers, system cost is high, and chromatic dispersion measurement is limited in scope, precision is not high, be fit to monitor within the specific limits the link dispersion situation of change, be not suitable for the link dispersion actual measurement, link data speed is high more, the realization difficulty of this type of scheme is big more, and these class methods are relevant with data modulation format, and a kind of scheme can only be at a certain particular modulation format; Monitoring of the RF spectrum analytic approach of surveying based on phase sensitive at linear dispersion, these class methods exist with such scheme similarly not enough, need to adopt photoelectric device at a high speed and expensive spectrum analysis instrument, measuring range is less than normal, and the measuring system volume is bigger than normal, can not realize that the chromatic dispersion of optical transmission system measures in real time, link dispersion polarity can not be discerned, and measuring system noise resistance poor-performing, and system cost is higher, measurement result is subjected to the device performance impact bigger, and repeatedly the consistency of measurement result is relatively poor.
Summary of the invention
At the deficiencies in the prior art, the invention provides the device that a kind of optical transmission system and dwdm system optical fiber link are measured at linear dispersion (CD), this device is based on single-ended measurement pattern, and the chromatic dispersion online in real time of any measurement point feasible system in optical transmission system is measured.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: the online chromatic dispersion measurement device of a kind of optical fiber link, comprise along frequency spectrum processing unit, light territory, photoelectric conversion unit, mixing unit and signal processing unit that light path connects successively,
Frequency spectrum processing unit, light territory is used for the light signal of optical fiber link input is carried out filtering, modulation treatment, and will specifies the two ways of optical signals after the upper and lower The Sideband Spectrum to output to photoelectric conversion unit respectively;
Photoelectric conversion unit is used for the two ways of optical signals of frequency spectrum processing unit, light territory output is surveyed, and is converted to two-way electricity territory signal, and this two path signal is outputed to the mixing unit;
The mixing unit is used for the two ways of optical signals of photoelectric conversion unit output is carried out Frequency mixing processing, and the signal of telecommunication after Frequency mixing processing is outputed to signal processing unit;
Signal processing unit is used to receive the signal that the mixing unit is exported, and signal is carried out analog-to-digital conversion process, and the signal after the analog-to-digital conversion process is carried out algorithm process, calculates the optical fiber link dispersion values.
Further, frequency spectrum processing unit, light territory comprises filter, optical link branch units and the signal frequency side band spectral separator that connects successively along light path,
Filter is used for the light signal of each channel of separation and Extraction optical fiber link;
The optical link branch units is used for the light path branch that will handle through filter;
The signal frequency side band separator, be used to receive the light signal of optical link branch units output, realize the upper and lower sideband spectrum of signal abstraction function, export the upper and lower sideband light signal of certain spectrum width, and will specify the two ways of optical signals after the upper and lower The Sideband Spectrum to output to photoelectric conversion unit.
Further, filter is a tunable, and the optical link branch units is an optical branching device, and the signal frequency side band separator is an optical band pass filter.
Further, tunable is array waveguide grating, Mach interferometer or micro-ring resonator now.
Further, optical branching device is 1 * 2 light path splitter.
Further, optical band pass filter is array waveguide grating, Mach interferometer or micro-ring resonator now.
Further, photoelectric conversion unit comprises first photodetector and second photodetector,
First photodetector is used for the upper sideband light signal of frequency spectrum processing unit, light territory output is surveyed, be converted to electric territory signal after, export the mixing unit to;
Second photodetector is used for the lower sideband light signal of frequency spectrum processing unit, light territory output is surveyed, be converted to electric territory signal after, export the mixing unit to.
Further, the mixing unit comprises first signal of telecommunication splitter, second signal of telecommunication splitter, the radio-frequency (RF) local oscillator source, and phase shifter, first frequency mixer, second frequency mixer, three-mixer and the 4th frequency mixer,
First signal of telecommunication splitter is used for wherein one road signal of telecommunication of photoelectric conversion unit output is branched into two path signal, and this two path signal is outputed to the rf inputs of first frequency mixer and second frequency mixer respectively;
Second signal of telecommunication splitter is used for another road signal of telecommunication of photoelectric conversion unit output is branched into two path signal, and this two path signal is outputed to the rf inputs of three-mixer and the 4th frequency mixer respectively;
The radio-frequency (RF) local oscillator source produces the radiofrequency signal of certain frequency, and radiofrequency signal that will wherein the two-way phase place is identical outputs to the local oscillator input of first frequency mixer and the 4th frequency mixer respectively, and the Third Road radiofrequency signal that the radio-frequency (RF) local oscillator source produces outputs to phase shifter;
Phase shifter is used for the radiofrequency signal of received RF local vibration source output, the phase shift that produces a certain size, and output is divided into two-way, outputs to the local oscillator input of second frequency mixer and three-mixer respectively;
First frequency mixer is used for the mixing with the two path signal of described first signal of telecommunication splitter and the output of radio-frequency (RF) local oscillator source, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit;
Second frequency mixer is used for the mixing with the two path signal of described first signal of telecommunication splitter and phase shifter output, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit;
Three-mixer is used for the mixing with the two path signal of described second signal of telecommunication splitter and phase shifter output, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit;
The 4th frequency mixer is used for the mixing with the two path signal of described second signal of telecommunication splitter and the output of radio-frequency (RF) local oscillator source, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit.
Further, signal processing unit comprises the analog to digital converter and the signal processor of series connection,
Analog to digital converter, the conversion of signals that is used for the output of mixing unit is a digital signal, and outputs to signal processor;
Signal processor is used to receive the digital signal of analog to digital converter output, and finishes the algorithm process of data, calculates the link dispersion characteristic quantity.
Further, signal processor is microcontroller, general processor, digital signal processor or field programmable gate array.
The invention has the beneficial effects as follows: the invention provides a kind of device that is implemented in the real-time measurement function of linear dispersion based on new signal spectral phase difference extracting method, utilize apparatus of the present invention to carry out the real-time method of measuring of optical fiber link chromatic dispersion compared with prior art, mainly possess following several respects advantage:
(1) the optical transmission system transmitting terminal is not done any change, do not influence the system transmissions quality, realize the size and the polarity of online measure link chromatic dispersion;
(2) this method need not be carried out data and recovered, need not clock synchronization or coupling requirement, realize that chromatic dispersion measurement and data modulation format, data rate have nothing to do;
(3) can realize the online parallel measurement in real time of single channel or multichannel chromatic dispersion, Measuring Time is short;
(4) link dispersion is measured with transfer of data and is carried out simultaneously, link communication is not brought any interference;
(5) measuring range scalable, certainty of measurement height, flexible operation;
(6) cost is low;
(7) system bulk is little, is easy to integratedly, can realize the chip solution of chromatic dispersion on-line measurement.
Description of drawings
Fig. 1 is the formation schematic diagram of first embodiment of the online chromatic dispersion measurement device of a kind of optical fiber link of the present invention;
Fig. 2 is the formation schematic diagram of second embodiment of a kind of measuring optical fiber link dispersion of the present invention measurement mechanism;
Fig. 3 is for being that 10Gb/s, data modulation format are that NRZ sign indicating number type link is a practical measuring examples with the single channel data rate, and getting RF local oscillation signal frequency is 2.4GHz, the upper and lower sideband phase difference measurement distribution of results curve that the online chromatic dispersion measurement of apparatus of the present invention obtains;
Fig. 4 is for being that 10Gb/s, data modulation format are that NRZ sign indicating number type link is a practical measuring examples with the single channel data rate, and getting RF local oscillation signal frequency is 2.4GHz, based on the correlation curve of online chromatic dispersion measurement result of apparatus of the present invention and link actual dispersion value;
Fig. 5 is the application mode schematic diagram of the online chromatic dispersion measurement device of optical fiber link of the present invention in point-to-point optical transmission system;
Fig. 6 is the application mode schematic diagram of the online chromatic dispersion measurement device of optical fiber link in dwdm system.
Embodiment
Mode by the following examples further specifies the present invention, does not therefore limit the present invention among the described scope of embodiments.
As shown in Figure 1, the online chromatic dispersion measurement device of optical fiber link of the present invention comprises along frequency spectrum processing unit, light territory 1, photoelectric conversion unit 2, mixing unit 3 and signal processing unit 4 that light path connects successively.
1 pair of incident light of optical spectrum processing unit carries out optical spectrum to be handled, in the separation, the lower sideband spectral signal, and output comprises carrier wave on the part of interior certain spectrum width, the lower sideband light signal, and with on the part, lower sideband signal is applied to photoelectric conversion unit 2, this optical spectrum processing unit 1 comprises the front-end filtering device 101 that connects successively along light path, optical link branch units 102 and signal frequency side band separator, wherein, filter 101 adopts tunable, tunable can adopt array waveguide grating (AWG), Mach is interferometer (MZI) now, micro-ring resonator etc., optical link branch units 102 adopts 1 * 2 light path splitter to realize the branch of light path; The signal frequency side band separator can adopt the optical band pass filter of the higher Q value of two-way to realize, this optical band pass filter is that first optical band pass filter 103 and second optical band pass filter, 104, the first optical band pass filters 103 and second optical band pass filter 104 can adopt array waveguide grating (AWG), Mach interferometer (MZI), micro-ring resonator etc. now.
System front end adopts tunable (OBPF) to extract the flashlight of optical transmission system or a certain channel of dwdm system, after being branched off into two-way, 1 * 2 light path splitter imposes on the first follow-up optical band pass filter 103 and second optical band pass filter 104 simultaneously from the light signal of OBPF output, realizing the upper and lower sideband spectrum of signal abstraction function, the electric field expression formula by the upper and lower sideband of light signal behind first optical band pass filter 103 and second optical band pass filter 104 is respectively:
Wherein,
Be the total signal energy of detector output, and
,
Be signal center's carrier angular frequencies,
Be the angular frequency of modulating data,
Be the lower sideband signal phase place,
Be the upper side band signal phase place.
Adopt the first photodetector 21(PD) and the second photodetector 22(PD) respectively the light signal of first optical band pass filter 103 and 104 outputs of second optical band pass filter is surveyed, be converted to electric territory signal, and the signal of telecommunication is applied to the mixing unit, the two-way orthogonal local oscillation signal of mixing unit is respectively:
Wherein,
Be the local oscillation signal angular frequency,
Be the local oscillation signal initial phase.
Mixing unit 3 mainly comprises the first telecommunications splitter 301, the second telecommunications splitter 302, RF radio-frequency (RF) local oscillator source 303, phase shifter 304, first frequency mixer 305, second frequency mixer 306, three-mixer 307 and the 4th frequency mixer 308.
First signal of telecommunication splitter 301 branches into two path signal with the signal of telecommunication of first photodetector, 21 outputs, and this two path signal is outputed to the rf inputs of first frequency mixer 305 and second frequency mixer 306 respectively; Second signal of telecommunication splitter 302 branches into two path signal with the signal of telecommunication of second photodetector, 22 outputs, and this two path signal is outputed to the rf inputs of three-mixer 307 and the 4th frequency mixer 308 respectively; RF radio-frequency (RF) local oscillator source 303 produces a certain frequency
The RF signal, to wherein three the tunnel output to the local oscillator input of first frequency mixer 305 and the 4th frequency mixer 308 respectively with the two-way in the homophase RF signals frequently, the Third Road RF signal that RF radio-frequency (RF) local oscillator source 303 produces outputs to phase shifter 304, the RF signal of 304 pairs of inputs of phase shifter produces 90 ° phase shift, phase shifter 304 output signals are divided into two-way, impose on the local oscillator input of second frequency mixer 306 and three-mixer 307 respectively simultaneously, first frequency mixer 305 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
Second frequency mixer 306 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
Three-mixer 307 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
The 4th frequency mixer 308 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
Two-way orthogonal local oscillation signal through RF mixing unit after the resulting signal expression of upper and lower sideband signals after through first photodetector 21 and second photodetector 22 is:
Upper sideband I road:
(5)
Upper sideband Q road:
(6)
Lower sideband I road:
(7)
Lower sideband Q road:
(8)
When needs extract the signal intermediate frequency rate be
Signal phase, make
=
, then Dui Ying I, Q two-way are output as:
（12）
Wherein,
Be the total signal energy of detector output, and
,
Be the lower sideband signal phase place,
Be the upper side band signal phase place,
Be the local oscillation signal phase place.
Signal processing unit 4 comprises the first analog to digital converter 41(ADC), the second analog to digital converter 42(ADC), the 3rd analog to digital converter 43(ADC), the 4th analog to digital converter 44(ADC) and signal processor 45; 4 road signals that first analog to digital converter, 41, the second analog to digital converters, 42, the three analog to digital converters, 43, the four analog to digital converters 44 are exported first frequency mixer 305, second frequency mixer 306, three-mixer 307 and the 4th frequency mixer 308 in the mixing unit 3 respectively
,
,
,
Be converted to digital signal, and send into and carry out Digital Signal Processing in the signal processor 45, signal processor 45 is finished the algorithm process of data and is calculated the link dispersion characteristic quantity, and signal processor 45 can adopt microcontroller (MCU), general processor (PC), digital signal processor (DSP), field programmable gate array realizations such as (FPGA).
And be worth by phase difference calculating outgoing link chromatic dispersion (CD) by following formula:
Wherein,
Be local oscillator RF signal initial phase, c is the light velocity,
By the centre wavelength of detection channel,
Be the angular frequency of RF signal, k is the correction factor during chromatic dispersion is calculated, and is determined by algorithm according to the different measuring scope.
Embodiment two
Present embodiment has provided the online simultaneously-measured embodiment of DWDM multichannel chromatic dispersion.
As shown in Figure 2, the tunable in the optical spectrum processing unit 1 adopts array waveguide grating as front-end filtering device 101, is used for separating the light signal of each channel of dwdm system
With
Channel dispersion is measured as example, array waveguide grating output
Channel optical signal imposes on optical link branch units 102, and optical link branch units 102 adopts
The light path splitter is realized the branch of light path; The signal frequency side band separator can adopt the optical band pass filter of the higher Q value of two-way to realize, this signal frequency side band separator comprises that first optical band pass filter 103 and second optical band pass filter, 104, the first optical band pass filters 103 and second optical band pass filter 104 can adopt array waveguide grating (AWG), Mach interferometer (MZI), micro-ring resonator etc. now.
System front end adopts array waveguide grating (AWG) to extract dwdm system
The flashlight of channel, after being branched off into two-way, 1 * 2 light path splitter imposes on the first follow-up optical band pass filter 103 and second optical band pass filter 104 simultaneously from the light signal of AWG output, realizing the upper and lower sideband spectrum of signal abstraction function, the electric field expression formula by the upper and lower sideband of light signal behind first optical band pass filter 103 and second optical band pass filter 104 is respectively:
Wherein,
Be the total signal energy of detector output, and
,
Be signal center's carrier angular frequencies,
Be the angular frequency of modulating data,
Be the lower sideband signal phase place,
Be the upper side band signal phase place.
Adopt the first photodetector 21(PD) and the second photodetector 22(PD) respectively the light signal of first optical band pass filter 103 and 104 outputs of second optical band pass filter is surveyed, be converted to electric territory signal, and the signal of telecommunication is applied to the mixing unit, the two-way orthogonal local oscillation signal of mixing unit is respectively:
Wherein,
Be the angular frequency of local oscillation signal,
Initial phase for local oscillation signal.
Mixing unit 3 mainly comprises the first telecommunications splitter 301, the second telecommunications splitter 302, RF radio-frequency (RF) local oscillator source 303, phase shifter 304, first frequency mixer 305, second frequency mixer 306, three-mixer 307 and the 4th frequency mixer 308.
First signal of telecommunication splitter 301 branches into two path signal with the signal of telecommunication of first photodetector, 21 outputs, and this two path signal is outputed to the rf inputs of first frequency mixer 305 and second frequency mixer 306 respectively; Second signal of telecommunication splitter 302 branches into two path signal with the signal of telecommunication of second photodetector, 22 outputs, and this two path signal is outputed to the rf inputs of three-mixer 307 and the 4th frequency mixer 308 respectively; RF radio-frequency (RF) local oscillator source 303 produces a certain frequency
The RF signal, to wherein three the tunnel output to the local oscillator input of first frequency mixer 305 and the 4th frequency mixer 308 respectively with the two-way in the homophase RF signals frequently, the Third Road RF signal that RF radio-frequency (RF) local oscillator source 303 produces outputs to phase shifter 304, the RF signal of 304 pairs of inputs of phase shifter produces 90 ° phase shift, phase shifter 304 output signals are divided into two-way, impose on the local oscillator input of second frequency mixer 306 and three-mixer 307 respectively simultaneously, first frequency mixer 305 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
Second frequency mixer 306 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
Three-mixer 307 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
The 4th frequency mixer 308 is finished the mixing of the two path signal of input, and to the frequency size that produces in the new frequency signal is
Intermediate-freuqncy signal is amplified, output signal
Two-way orthogonal local oscillation signal through RF mixing unit after the resulting signal expression of upper and lower sideband signals after through first photodetector 21 and second photodetector 22 is:
Upper sideband I road:
(5)
Upper sideband Q road:
(6)
Lower sideband I road:
(7)
Lower sideband Q road:
(8)
When needs extract the signal intermediate frequency rate be
Signal phase, make
=
, then Dui Ying I, Q two-way are output as:
（9）
Wherein,
Be the total signal energy of detector output, and
,
Be local oscillator RF signal initial phase,
Be the lower sideband signal phase place,
Be the upper side band signal phase place.
Signal processing unit 4 comprises first analog to digital converter 41, second analog to digital converter 42, the 3rd analog to digital converter 43, the 4th analog to digital converter 44 and signal processor 45; 4 road signals that first analog to digital converter, 41, the second analog to digital converters, 42, the three analog to digital converters, 43, the four analog to digital converters 44 are exported first frequency mixer 305, second frequency mixer 306, three-mixer 307 and the 4th frequency mixer 308 in the mixing unit 3 respectively
,
,
,
Be converted to digital signal, and send into and carry out Digital Signal Processing in the signal processor 45, signal processor 45 is finished the algorithm process of data and is calculated the link dispersion characteristic quantity, and signal processor 45 can adopt microcontroller (MCU), general processor (PC), digital signal processor (DSP), field programmable gate array realizations such as (FPGA).
（13）
And be worth by phase difference calculating outgoing link chromatic dispersion (CD) by following formula:
Wherein, be local oscillator RF signal initial phase, c is the light velocity,
By the centre wavelength of detection channel,
Be the angular frequency of RF signal, k is the correction factor during chromatic dispersion is calculated, and is determined by algorithm according to the different measuring scope.
Fig. 3 is for being that 10Gb/s, data modulation format are NRZ sign indicating number type (Non-Return-to-Zero with the single channel data rate, nonreturn to zero code) link is a practical measuring examples, getting RF local oscillation signal frequency is 2.4GHz, adopt the online chromatic dispersion measurement of apparatus of the present invention, the upper and lower sideband phase difference curve that calculates, the upper and lower sideband phase difference calculating outgoing link dispersion values curve of Fig. 4 for recording by apparatus of the present invention.
Apparatus of the present invention apparatus of the present invention are applied to optical transmission system and the DWDM optical transmission system is implemented in the linear dispersion measurement function.
As shown in Figure 5, the application mode of the online chromatic dispersion measurement device of optical fiber link of the present invention in point-to-point optical transmission system described.The online chromatic dispersion measurement device of optical fiber link of the present invention can be in optical transmission system the arbitrfary point realize the online in real time chromatic dispersion measurement, for optical transmission system designer or system operator provide the dispersion information of optical transmission chain accurately; The real-time dispersion values of link that the online chromatic dispersion measurement measurement device of optical fiber link of the present invention goes out can be used as the adjusting foundation of receiving terminal Tunable Dispersion Compensator (TDC) chromatic dispersion compensation quantity.
As shown in Figure 6, the application mode of the online chromatic dispersion measurement device of optical fiber link of the present invention in dwdm system described; The online chromatic dispersion measurement device of optical fiber link of the present invention can be realized the online in real time chromatic dispersion measurement in the arbitrfary point in dwdm system, (TDC) provides the link dispersion compensation basis for Tunable Dispersion Compensator, chromatic dispersion measurement device online in real time measure link dispersion values of the present invention, and institute's surveyor's chain road dispersion values passed to the link dispersion ADMINISTRATION SUBSYSTEM as feedback signal, thereby realize the high accuracy chromatic dispersion online management function of optical transmission system.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. online chromatic dispersion measurement device of optical fiber link is characterized in that: comprises along frequency spectrum processing unit, light territory, photoelectric conversion unit, mixing unit and signal processing unit that light path connects successively,
Frequency spectrum processing unit, described smooth territory is used for the light signal of optical fiber link input is carried out filtering, modulation treatment, and will specifies the two ways of optical signals after the upper and lower The Sideband Spectrum to output to photoelectric conversion unit respectively;
Described photoelectric conversion unit is used for the two ways of optical signals of frequency spectrum processing unit, described smooth territory output is surveyed, and is converted to two-way electricity territory signal, and this two path signal is outputed to the mixing unit;
Described mixing unit is used for the two ways of optical signals of described photoelectric conversion unit output is carried out Frequency mixing processing, and the signal of telecommunication after Frequency mixing processing is outputed to signal processing unit;
Described signal processing unit is used to receive the signal that described mixing unit is exported, and signal is carried out analog-to-digital conversion process, and go out optical fiber link dispersion value according to the calculated signals after the analog-to-digital conversion process.
2. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 1 is characterized in that: frequency spectrum processing unit, described smooth territory comprises filter, optical link branch units and the signal frequency side band spectral separator that connects successively along light path,
Described filter is used to separate the light signal of each channel of optical fiber link;
Described optical link branch units is used for the light path branch that will handle through filter;
Described signal frequency side band separator, be used to receive the light signal of optical link branch units output, realize the upper and lower sideband spectrum of signal abstraction function, export the upper and lower sideband light signal of certain spectrum width, and will specify the two ways of optical signals after the upper and lower The Sideband Spectrum to output to photoelectric conversion unit.
3. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 2 is characterized in that: described filter is a tunable, and described optical link branch units is an optical branching device, and described signal frequency side band separator is an optical band pass filter.
4. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 3 is characterized in that: described tunable is array waveguide grating, Mach interferometer or micro-ring resonator now.
5. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 3 is characterized in that: described optical branching device is 1 * 2 light path splitter.
6. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 3 is characterized in that: described optical band pass filter is array waveguide grating, Mach interferometer or micro-ring resonator now.
7. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 1 is characterized in that: described photoelectric conversion unit comprises first photodetector and second photodetector,
Described first photodetector is used for the upper sideband light signal of frequency spectrum processing unit, light territory output is surveyed, be converted to electric territory signal after, export the mixing unit to;
Described second photodetector is used for the lower sideband light signal of frequency spectrum processing unit, light territory output is surveyed, be converted to electric territory signal after, export the mixing unit to.
8. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 1, it is characterized in that: described mixing unit comprises first signal of telecommunication splitter, second signal of telecommunication splitter, the radio-frequency (RF) local oscillator source, phase shifter, first frequency mixer, second frequency mixer, three-mixer and the 4th frequency mixer
Described first signal of telecommunication splitter is used for wherein one road signal of telecommunication of described photoelectric conversion unit output is branched into two path signal, and this two path signal is outputed to the rf inputs of first frequency mixer and second frequency mixer respectively;
Described second signal of telecommunication splitter is used for another road signal of telecommunication of described photoelectric conversion unit output is branched into two path signal, and this two path signal is outputed to the rf inputs of three-mixer and the 4th frequency mixer respectively;
Described radio-frequency (RF) local oscillator source produces the radiofrequency signal of certain frequency, and radiofrequency signal that will wherein the two-way phase place is identical outputs to the local oscillator input of first frequency mixer and the 4th frequency mixer respectively, and the Third Road radiofrequency signal that the radio-frequency (RF) local oscillator source produces outputs to phase shifter;
Described phase shifter is used for the radiofrequency signal of received RF local vibration source output, the phase shift that produces a certain size, and output is divided into two-way, outputs to the local oscillator input of second frequency mixer and three-mixer respectively;
Described first frequency mixer is used for the mixing with the two path signal of described first signal of telecommunication splitter and the output of radio-frequency (RF) local oscillator source, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit;
Described second frequency mixer is used for the mixing with the two path signal of described first signal of telecommunication splitter and phase shifter output, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit;
Described three-mixer is used for the mixing with the two path signal of described second signal of telecommunication splitter and phase shifter output, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit;
Described the 4th frequency mixer is used for the mixing with the two path signal of described second signal of telecommunication splitter and the output of radio-frequency (RF) local oscillator source, and the intermediate-freuqncy signal that produces the certain frequency size in the new frequency signal is amplified, and output signal is to signal processing unit.
9. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 1 is characterized in that: described signal processing unit comprises the analog to digital converter and the signal processor of series connection,
Described analog to digital converter, the conversion of signals that is used for the output of mixing unit is a digital signal, and outputs to signal processor;
Described signal processor is used to receive the digital signal of analog to digital converter output, and finishes the algorithm process of data, calculates the link dispersion characteristic quantity.
10. the online chromatic dispersion measurement device of a kind of optical fiber link according to claim 9 is characterized in that: described signal processor is microcontroller, general processor, digital signal processor or field programmable gate array.
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| CN102636337A (en) * | 2012-04-26 | 2012-08-15 | 江苏大学 | Method for measuring optical fiber dispersion |
| CN102832995A (en) * | 2012-08-30 | 2012-12-19 | 华中科技大学 | Online chromatic dispersion monitoring device and measuring device |
| CN105933056A (en) * | 2016-04-14 | 2016-09-07 | 华中科技大学 | Dispersion measuring method and system based on high-resolution tunable optical filter |
| CN108631881A (en) * | 2017-03-24 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of relevant electro-optical device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102636337A (en) * | 2012-04-26 | 2012-08-15 | 江苏大学 | Method for measuring optical fiber dispersion |
| CN102832995A (en) * | 2012-08-30 | 2012-12-19 | 华中科技大学 | Online chromatic dispersion monitoring device and measuring device |
| CN105933056A (en) * | 2016-04-14 | 2016-09-07 | 华中科技大学 | Dispersion measuring method and system based on high-resolution tunable optical filter |
| CN105933056B (en) * | 2016-04-14 | 2019-07-09 | 华中科技大学 | Chromatic dispersion measurement method and system based on high-resolution adjustable light wave-filter |
| CN108631881A (en) * | 2017-03-24 | 2018-10-09 | 中兴通讯股份有限公司 | A kind of relevant electro-optical device |
| CN108631881B (en) * | 2017-03-24 | 2023-11-07 | 中兴通讯股份有限公司 | Coherent light device |
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