CN106330360A - Optical channel detection device and method thereof - Google Patents

Abstract

The invention discloses an optical channel detection device comprising an adjustable optical filter device, an optical splitting device, a control and data processing unit, a first optical detection device and a second optical detection device, wherein after receiving a to-be-detected multi-wave optical signal, the optical splitting device separates a part of signal energy to the first optical detection device, and the other part of signal energy is input by the adjustable optical filter device to the second optical detection device; and a measurement result of the second optical detection device is corrected by the measurement result of the first optical detection device to acquire related performance parameters of an optical channel. The method comprises the steps of carrying out algorithm calculation on two groups of detection results before and after filtering according to the to-be-detected signal acquired by the device to acquire the performance parameters of the signal. The optical performance analysis errors caused by loss calibration errors of the filter device can be reduced.

Description

A kind of optical channel detection devices and methods therefor

Technical field

The present invention relates to optical channel detection devices and methods therefor in a kind of wavelength-division multiplex system, the invention belongs to optical communication technology Art field.

Background technology

Wavelength-division multiplex (WDM) technology is widely used in fiber optic communication field at present, and WDM technology can be on an optical fiber The independent light channel that carrying many spectrally separates, thus lifting message capacity at double.Further, become along with optical channel interval Obtaining more and more narrow, the business on optical-fiber network increases, and the monitoring to network also becomes more important with management.Many telecom operators Signal on optical-fiber network can be detected by requirement, the optical property parameter of specifically monitored some signal in acquisition network, and accordingly Optimize network performance, it is achieved being reconfigured at and self management of optical-fiber network.

The device realizing optical property detection has multiple design structure, and one of which mainstream scheme uses tunable optical filter Optical property detection is realized together with light detection device.Many wave optical signals are narrow by light filter only transmission or reflection transmission belt Band portion energy, utilizes light detection device to detect this narrow portion energy.By controlling the centre wavelength of tunable optical filter Whole transmission belt scans, obtains many wave optical signals detecting light spectrum in whole transmission belt.Eventually through certain algorithm root It is analyzed calculating according to detecting light spectrum, obtains the correlation performance parameters of optical channel.

Signal can produce certain loss through adjustable filter, in actual applications, needs in advance filter Loss demarcate, and in final result, revise this partition losses, real optical signal property parameter could be obtained.So And, the adjustable filter no matter based on which kind of scheme realized, owing to the optical characteristics of adjustable filter own tends to vary with temperature Change etc. factor, it is difficult to keep stable, inevitably will there is error the loss of adjustable filter is carried out timing signal. The measurement result directly utilizing this type of detection device will appear from certain deviation.

Summary of the invention

The present invention overcomes the defect that prior art exists, it is provided that a kind of optical channel detection dress in wavelength-division multiplex system Put and method.Described device includes tunable optical filter, at least two light detection device, control and data processing unit.Institute State tunable optical filter and described light detection device electrically connects with described control and data processing unit respectively.Described at least two Before individual light detection device is connected with tunable optical filter light, and two light detection devices are respectively placed in tunable optical filter After.

The technical scheme that the present invention realizes is:

A kind of optical channel detection device, including tunable optical filter, light-dividing device, control and data processing unit, the One light detection device, the second light detection device, wherein: after described light-dividing device receives many wave optical signals to be detected, a part Signal energy separates to described first light detection device, and another part signal energy inputs institute through described tunable optical filter State the second light detection device；By the measurement result of described first light detection device, the measurement of described second light detection device is tied Fruit is modified, and then obtains the correlation performance parameters of optical channel.

The measurement result of described second light detection device is entered by the described measurement result by described first light detection device Row correction includes: described control and data processing unit control the first light detection device and sample, and calculates and obtains letter to be detected Number general power P_sum；Described control and data processing unit adjust tunable optical filter, scan in the range of full transmission bandwidth And control described second light detection device synchronized sampling simultaneously；The sampled data selecting full transmission bandwidth scope calculates to be detected The general power P ' of signal_sum, select to meet the sampled data of channel width scope, calculate the power P of each passage_ch；Calculate after revising Each channel power P '_ch=P_ch*(P_sum/P′_sum)。

Described tunable optical filter use tunable optical filter, tunable optical filter be MEMS tunable optical filter or F-P tunable optical filter.

Described tunable optical filter uses one or more independent wave filter to cascade.

Described tunable optical filter uses and can be implemented in the optics realizing one or more levels filtering in same wave filter Device.

The splitting ratio of described light-dividing device arranges and need to meet the loss of tunable optical filter, filtering stage time and optical detection The requirement of the receiving sensitivity of device.

Described first light detection device, the second light detection device use photo-detector.

The optical channel detection method of a kind of optical channel detection device, obtains input in the detection of tunable optical filter front end and treats Detection signal is in general power P_sum of whole transmission belt；Regulation tunable optical filter, is carried out in tunable optical filter rear end Detection sampling, selects the sampled data of full transmission bandwidth scope to calculate the general power P ' of signal to be detected_sum, select to meet channel The sampled data of bandwidth range, calculates the power P of each passage_ch；By P_sum、P′_sum、P_chCalculate revised each channel power P '_ch =P_ch*(P_sum/P′_sum)。

Specifically include following steps: step 1, control and data processing unit control the first light detection device and sample, Calculate general power P obtaining signal to be detected_sum；Step 2, control and data processing unit adjust tunable optical filter, entirely Scan in the range of transmission bandwidth, control the second light detection device synchronized sampling simultaneously.Select the hits of full transmission bandwidth scope According to the general power calculating signal to be detectedWherein BW_bandRepresent the signal bandwidth in whole transmission belt, i ∈BW_bandRepresent the fully sampled point of whole transmission belt；Select to meet the sampled data of channel width scope, calculate the merit of each passage RateWherein, i is sampled point sequence number, and ch is signalling channel mark, BW_chIt is the bandwidth of channel ch, D (i) Being the power of the i-th sampled point on detecting light spectrum, K is the calibration coefficient of tunable optical filter, P_chIt is the power of channel ch；

Step 3, by P_sum、P′_sum、P_chCalculate revised each channel power P '_ch=P_ch*(P_sum/P′_sum), and then obtain The correlation performance parameters of optical channel.

The invention have the advantage that

The signal to be detected that the inventive method obtains according to described device two groups of result of detections before and after filtering are calculated Method calculates, and obtains the performance parameter of signal, can reduce the optical property analysis deviation brought by filter loss calibrated error.

Accompanying drawing explanation

Fig. 1 is the first embodiment schematic diagram of the optical channel detection device of the present invention；

Fig. 2 is the filtering sampling spectrum special case of measured signal of the present invention；

Fig. 3 is the second embodiment schematic diagram of the optical channel detection device of the present invention；

Wherein:

10: input port；21: light-dividing device；

31: tunable optical filter；301: the first tunable optical filters；

302: the second tunable optical filters；41: the first light detection devices；

42: the second light detection devices；51: control and data processing unit；

Detailed description of the invention

First the starting point of the present invention is briefly described: use tunable optical filter to coordinate with light detection device, by control The centre wavelength of tunable optical filter processed scans in whole signal transmission belt, while scanning, utilizes light detection device Detect the narrow portion energy that the filtered device of each scanning element filters, the spectrum of signal to be detected can be obtained, finally by one Detecting light spectrum is analyzed calculating by fixed algorithm, is a kind of conventional means realizing optical property detection.Utilizing above-mentioned spectrum When calculating optical property parameter, need in advance optical signal to be demarcated through the loss of adjustable filter.Due to adjustable filtering The optical characteristics of device own tends to vary with the factor changes such as temperature, it is difficult to keeping stable, the loss to adjustable filter is marked To inevitably there is error in timing, thus directly affects the accuracy that optical property parameter calculates.

The present invention provides a kind of optical channel in wavelength-division multiplex system to detect device and method, it is possible to obtains and is more as the criterion True optical property parameter, this device and method can reduce the final result deviation brought by filter loss calibrated error.

Fig. 1 illustrates first embodiment of the present invention device, including light-dividing device 21, tunable optical filter the 31, first light Detection device the 41, second light detection device 42, control and data processing unit 51, wherein tunable optical filter 31 uses adjustable Optical filter 301.From many wave optical signals to be detected of input port 10, through light-dividing device 21, a part of signal energy Being separated to the first light detection device 41, another signal energy is after tunable optical filter 31, by the second optical detection dress Put 42 receptions.Control and data processing unit 51 fills with the 31, first light detection device the 41, second optical detection of tunable optical filter Put 42 electrical connections.

Control and data processing unit 51 controls tunable optical filter 31 and scans in whole signal transmission belt, and control The narrow portion energy that the second light detection device 42 each scanning element of synchronous detecting filters through tunable optical filter 31, can obtain Signal energy to be detected is with the spectral information of wavelength change.Lower Fig. 2 illustrate second light detection device 42 obtain comprise three lists The filtering sampling spectrum special case of ripple signal.

According to the device of Fig. 1 embodiment, the first light detection device 41 is positioned at tunable optical filtering dress to the sampling location of light path Before putting 31, control and data processing unit control light first detects device 41 and samples, at the splitting ratio of known light-dividing device 21 On the premise of, utilize the first light detection device 41 can detect general power P_ inputting signal to be detected in whole transmission belt sum.Further, before being positioned at tunable optical filter 31 due to the first light detection device 41, general power P_sum will not be by adjustable The impact of light filter 31 optical characteristics calibrated error own, the P_sum of acquisition will be the most accurate.

Fig. 2 illustrate second light detection device 42 obtain the sampling spectrum special case comprising three channels, below in conjunction with Fig. 2 pair The detection method of the present invention is described further.The spectrum D that samples in Fig. 2 comprises three channel sample spectrum A, B, C.Obtaining light After spectrum, calculate the power of each channel as follows with the bandwidth at A, B, C sampling spectrum place:

$P_{ch}=K*\underset{i\∈{\mathrm{BW}}_{ch}}{\Σ}D\left(i\right)---(1-1)$

Wherein, i is sampled point sequence number, and ch is signalling channel mark, BW_chBeing the bandwidth of channel ch, D (i) is spectrally i-th The power of sampled point, K is the calibration coefficient of tunable optical filter 31, P_chIt is the power of channel ch.

From formula (1-1) it will be seen that the spectrum utilizing the second light detection device 42 to obtain carries out the power calculation of channel, Result is relevant to the calibration coefficient K of tunable optical filter 31, and calibration coefficient K is used for revising flashlight through tunable optical filtering dress Put 31 energy losses brought.As it was noted above, calibrating parameters K affected by the optical stability of tunable optical filter 31 and There is error, and along with the increase of filtering stage time, the error of K also can expansion at double.If therefore directly utilizing the second light The detecting light spectrum of detection device 42 calculates channel power, is affected by calibrated error K, P_chDeviation will be produced.

In the present invention, before adjustable filter 31, place the first light detection device 41, as it was noted above, utilize the first light Detection device 41 detects general power P of input signal_sumNot by tunable optical filter 31 optical characteristics calibrated error own Impact, will be the most accurate.

Utilize P_sumTo the P in formula (1-1)_chIt is modified, revises step as follows:

Step 1, control and data processing unit 51 control the first light detection device 41 and sample, and calculate acquisition to be detected General power P of signal_sum；

Step 2, control and data processing unit 51 adjust tunable optical filter 31, sweep in the range of full transmission bandwidth Retouch, control the second light detection device 42 synchronized sampling simultaneously.The sampled data selecting full transmission bandwidth scope calculates letter to be detected Number general power P '_sum, select to meet the sampled data of channel width scope, calculate the power P of each passage_ch.Wherein P_chMeter Calculation method such as formula (1-1) is described.

$P_{sum}^{\′}=K*\underset{i\∈{\mathrm{BW}}_{band}}{\Σ}D\left(i\right)---(1-2)$

Wherein BW_bandRepresent the signal bandwidth in whole transmission belt, i ∈ BW_bandRepresent the fully sampled point of whole transmission belt. It can be seen that utilize the P ' that the second light detection device 42 sampled data obtains_sumComprise the calibration coefficient K of filter 31 equally. P ' in the present invention_sumAnd P_chComputation bandwidth be different.

Utilize above-mentioned P_sum、P′_sum、P_ch, calculate revised each channel power P '_ch

$P_{ch}^{\′}=P_{ch}*\frac{P_{sum}}{P_{sum}^{\′}}=\frac{{\Σ}_{i\∈{\mathrm{BW}}_{ch}}D\left(i\right)}{{\Σ}_{i\∈{\mathrm{BW}}_{band}}D\left(i\right)}*P_{sum}---(1-3)$

From formula (1-3) it will be seen that revised each channel power P '_chWill not depend on tunable optical filter 31 Calibration coefficient, its result will be more accurate.The optical channel performance number utilizing apparatus of the present invention and method detection can reach accurate Effect.

Tunable optical filter 31 in the present embodiment can become based on the art such as such as grating+MEMS, F-P cavity Ripe technical scheme realizes.Meanwhile, filtering stage time can be one-level or multistage.When multiple-stage filtering, tunable optical filter 31 can be multiple independent wave filter cascades, or by certain optical instrument, makes optical signal repeatedly through same adjustable Optical filter.The splitting ratio of light-dividing device 21 in principle should according to the loss of tunable optical filter 31, filtering stage time and The receiving sensitivity of detection device is arranged flexibly.Detection device can select the technology that the art such as photodiode are ripe Scheme.

Fig. 3 illustrates second embodiment of the invention schematic diagram, and in this embodiment, tunable optical filter 31 includes that first is adjustable Wave filter 301 and the second tunable filter 302.From many wave optical signals to be detected of input port 10, through light-dividing device 21, a part of signal energy is separated to the first light detection device 41, and another signal energy is through the first tunable optical filter 301, after the second tunable optical filter 302, the second light detection device 42 receive.Control and data processing unit 51 and first can Light modulation wave filter the 301, second tunable optical filter the 302, first light detection device the 41, second light detection device 42 electrically connects.Control System and data processing unit 51 control the first tunable optical filter 301 and the second tunable optical filter 302 transmits at whole signal Synchronous scanning on band, and control the second light detection device 42 each scanning element of synchronous detecting through tunable optical filter 31 filter narrow Band portion energy, can obtain the signal energy to be detected spectral information with wavelength change.In the present invention, the first optical detection dress Put, the second light detection device uses photo-detector.

The optical channel detection method of second embodiment of the invention is consistent with first embodiment of the present invention step, at this no longer Repeat.

In a word, the present invention propose a kind of optical channel detection device and method, described device include tunable optical filter, At least two light detection device, control and data processing unit.Described tunable optical filter and described light detection device are respectively Electrically connect with described control and data processing unit.At least two light detection device is connected with tunable optical filter light, and Before and after two light detection devices are respectively placed in tunable optical filter.The signal to be detected that described method obtains according to described device Two groups of result of detections before and after filtering, utilize the result of detection before filtering to be modified filtered structure, can obtain The performance parameter of the signal unrelated with filter calibration coefficient.

Embodiment described above only have expressed certain embodiment of the present invention, and it describes more concrete and detailed, but also Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that, for those of ordinary skill in the art For, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into the guarantor of the present invention Protect scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (9)

1. an optical channel detection device, it is characterised in that: include at tunable optical filter, light-dividing device, control and data Reason unit, the first light detection device, the second light detection device, wherein:

After described light-dividing device receives many wave optical signals to be detected, a part of signal energy separates to described first optical detection dress Putting, another part signal energy inputs described second light detection device through described tunable optical filter；By described first The measurement result of described second light detection device is modified by the measurement result of light detection device, and then obtains the phase of optical channel Close performance parameter.

A kind of optical channel detection device the most according to claim 1, it is characterised in that: described by described first optical detection The measurement result of described second light detection device is modified including by the measurement result of device: described control and data process single Unit controls the first light detection device and samples, and calculates general power P obtaining signal to be detected_sum；Described control and data process Unit adjusts tunable optical filter, scans and control described second light detection device together simultaneously in the range of full transmission bandwidth Step sampling；The sampled data selecting full transmission bandwidth scope calculates the general power P ' of signal to be detected_sum, select to meet channel strip The sampled data of wide scope, calculates the power P of each passage_ch；Calculate revised each channel power P '_ch=P_ch*(P_sum/P ′_sum)。

A kind of optical channel detection device the most according to claim 1 and 2, it is characterised in that: described tunable optical filter Using tunable optical filter, tunable optical filter is MEMS tunable optical filter or F-P tunable optical filter.

A kind of optical channel detection device the most according to claim 3, it is characterised in that: described tunable optical filter uses one Individual or multiple independent wave filter cascade.

A kind of optical channel detection device the most according to claim 1, it is characterised in that: described tunable optical filter uses can To realize realizing the optics of one or more levels filtering in same wave filter.

A kind of optical channel detection device the most according to claim 1, it is characterised in that: the splitting ratio of described light-dividing device sets Put the requirement of the receiving sensitivity that need to meet the loss of tunable optical filter, filtering stage time and light detection device.

A kind of optical channel detection device the most according to claim 1, it is characterised in that: described first light detection device, the Two light detection devices use photo-detector.

8. apply the optical channel detection side detecting device according to a kind of optical channel according to any one of claim 1-7 for one kind Method, it is characterised in that:

General power P_sum inputting signal to be detected in whole transmission belt is obtained in the detection of tunable optical filter front end；

Regulation tunable optical filter, carries out detection sampling, selects full transmission bandwidth scope in tunable optical filter rear end Sampled data calculates the general power P ' of signal to be detected_sum, select to meet the sampled data of channel width scope, calculate each passage Power P_ch；By P_sum、P′_sum、P_chCalculate revised each channel power P '_ch=P_ch*(P_sum/P′_sum)。

A kind of optical channel detection method the most according to claim 8, it is characterised in that: specifically include following steps:

Step 1, control and data processing unit control the first light detection device and sample, and calculate and obtain the total of signal to be detected Power P_sum；

Step 2, control and data processing unit adjust tunable optical filter, scan, same time control in the range of full transmission bandwidth Make the second light detection device synchronized sampling.The sampled data selecting full transmission bandwidth scope calculates the general power of signal to be detectedWherein BW_bandRepresent the signal bandwidth in whole transmission belt, i ∈ BW_bandRepresent whole transmission belt Fully sampled point；Select to meet the sampled data of channel width scope, calculate the power of each passageWherein, i Being sampled point sequence number, ch is signalling channel mark, BW_chBeing the bandwidth of channel ch, D (i) is the merit of the i-th sampled point on detecting light spectrum Rate, K is the calibration coefficient of tunable optical filter, P_chIt is the power of channel ch；

Step 3, by P_sum、P′_sum、P_chCalculate revised each channel power P '_ch=P_ch*(P_sum/P′_sum), and then obtain light letter The correlation performance parameters in road.