CN1178082C - Method for improving wavelength resolution of optical performance monitor - Google Patents
Method for improving wavelength resolution of optical performance monitor Download PDFInfo
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- CN1178082C CN1178082C CNB021156611A CN02115661A CN1178082C CN 1178082 C CN1178082 C CN 1178082C CN B021156611 A CNB021156611 A CN B021156611A CN 02115661 A CN02115661 A CN 02115661A CN 1178082 C CN1178082 C CN 1178082C
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Abstract
The present invention provides a method for improving the wavelength resolution of an optical performance monitor based on a raster and an array detector. An optical signal is input by the input port, an optical spectrum space of the optical signal is distributed on the array detecting plane by a light splitting component group, and measured data are analyzed and processed by the data processing part. The present invention is characterized in that optical spectrums which are distributed at the optical signal space are orderly and horizontally moved by a section of distance on the detecting plane, so that the same pixels can measure different wave length values. Particularly, the light input port uses an optical switch having a routing function to control the horizontal movement distance of the whole spectrum of the input optical signal on the detecting plane by controlling an included angle of the input ports of the adjacent optical signals. The present invention can be realized in modes, such as the equal spaced rotation of the raster angle in the light splitting component group, the equal spaced movement of the array detector, the equal spaced change of the direction of an incident angle, etc. The translational distance is one of N pixel line width.
Description
Technical field
The present invention relates to a kind of method that improves optical property monitor wavelength resolution, particularly improve method based on optical property monitor (OPM) wavelength resolution of grating and detector array.
Background technology
High-speed high capacity dense wavelength division multiplexing system and all-optical network have begun to use widely,, reliably transmission stable for guarantee information need to use the performance (performance of light signal comprise three indexs: power, wavelength, Optical Signal To Noise Ratio) of optical property monitor at the real-time monitor optical signal of optical transport layer.This application has proposed very high requirement to the optical property monitor: should have the comparable spectral analysis capabilities of using with the laboratory of spectroanalysis instrument; have again high speed detection and report fault ability (typically measure and report time in the millisecond magnitude; and be less than the 50ms time that optical-fiber network is protected automatically); the optical property monitor also will be applicable to on-the-spot installing and using simultaneously, requires its as far as possible little calibration to reach calibration requirements more again.For satisfying the every requirement to the optical property monitor, most optical property monitor adopts grating to add the structure of high resolving power detector array.The optical property monitor of this structure has that volume is little, compact conformation, the advantage of measuring at a high speed and owing to not have to need mobile parts, needs hardly after the calibration to calibrate again.Can be comparable aspect the ability of measuring light power and Optical Signal To Noise Ratio through this optical property monitor after the algorithm process with the spectroanalysis instrument that use in the laboratory.But the size of the optical property monitor of this structure dependence detector array pixel and the number of total pixel provide the measurement and the resolution characteristic of wavelength.Limited by single pixel size and number of total picture element purpose, wavelength resolution can not satisfy the requirement of high performance optical property monitor.For example, optical property monitor with light signal in the spectral range of the detector array of pixel live width 25um, total 512 pixels monitoring C-band 32nm, its wavelength resolution is every pixel 0.0625nm, after treatment, wavelength resolution has just satisfied the requirement of the optical property monitoring of 50GHz, and, then can't provide the wavelength resolution of requirement for the spectral range of the spectral range of broad even wideer C+L section.In order to improve wavelength resolution, the method that adopts is the size that reduces single pixel at present, increases the pixel sum simultaneously.Present single pixel size minimum normally adopts the way that increases the pixel sum to increase wavelength resolution at 25um, and this can cause the size of entire device to increase and the huge of cost expends.
Summary of the invention
The purpose of this invention is to provide a kind of simple method that improves wavelength resolution.This method can increase exponentially the wavelength resolution of optical property monitor (OPM) in the invariable number of the size that keeps pixel and total pixel.
Technical scheme of the present invention is: by light input end mouth input optical signal, be distributed on the array detection plane by the spectral space of chromatic dispersion beam splitter group partly light signal, by data processing section measurement data is analyzed and handled, it is characterized in that spectrum with light signal space distribution translation one segment distance successively on detection plane, the distance of translation is N/one of pixel live width, makes same pixel energy measure different wavelength value.
One of method of described raising optical property monitor wavelength resolution is that the employing of light input end mouth has the photoswitch that function is selected on the road, the N of a photoswitch output port links to each other with N input port of chromatic dispersion part, photoswitch is gating N input port successively, light signal is input to successively in N the input port of chromatic dispersion part, from different input port input optical signals, make whole spectrum translation one segment distance on detection plane by successively.
Two of the method for described raising optical property monitor wavelength resolution is the angles by the grating in the equally spaced rotation beam splitter group, controls the corresponding segment distance of whole spectrum translation on detection plane, makes same pixel energy measure different wavelength value.
Three of the method for described raising optical property monitor wavelength resolution is equally spaced mobile detector arrays, makes same pixel energy measure different wavelength value.
Four of the method for described raising optical property monitor wavelength resolution is that N input port of chromatic dispersion part has fixing angle (this angle can have multiple different value) each other, from different input port input optical signals, make whole spectrum translation one segment distance successively on detection plane by successively.
The method of described raising optical property monitor wavelength resolution is translation 2-7 time successively on detection plane of spectrum with the light signal space distribution, makes same pixel energy measure 2-7 different wavelength value.
Be elected to when using photoswitch, select for use the photoswitch of 2-7 output port to link to each other with 2-7 input port of chromatic dispersion part, photoswitch is gating 2-7 input port successively.
Description of drawings
Accompanying drawing 1 is to adopt to have the road to select photoswitch embodiment schematic diagram, the accompanying drawing 2 of function be to be that mobile array detection plane embodiment schematic diagram, Fig. 4 at interval is mobile array detection plane embodiment partial enlarged drawing at interval, the direction embodiment schematic diagram that Fig. 5 is equally spaced change incident angle by equally spaced rotating shutter embodiment schematic diagram, Fig. 3.10 is photoswitches among the figure, the 11st, and input waveguide, 11-1,11-2 are the fixing input waveguides of two angles, the 12nd, collimation lens, the 13rd, diffraction grating, the 14th, plus lens, the 15th, detection plane, the 16th, detector array, the 17th, data acquisition unit, the 18th, data-carrier store, the 19th, data processor, the 20th, the beam angle deflector, 1,2,3,4 is respectively the interface point between each pixel.
Embodiment
Be that example illustrates embodiment to adopt photoswitch at first: it is by the photoswitch of a 1 * N, and its N output terminal links to each other with N input port of chromatic dispersion part; Chromatic dispersion part with N input port, the corresponding different incident angle of different input ports is a corresponding different output spectrum translational movement spatially; By photoswitch gating N input port successively, successively from different input port input optical signals, after the beam splitter group by the chromatic dispersion part, the spectrum of the space distribution of light signal translation one segment distance successively on detection plane, the angle that the size of translation distance and adjacent input port are corresponding is relevant.Like this, same pixel can be measured the value of different wave length, by analysis, the processing of data processing section to measurement data, thereby makes wavelength resolution improve N doubly than original wavelength measured value.
For the ease of better the understanding of the present invention, we become two groups with one group of wavelength data, and to have the photoswitch embodiment of selecting function in the road with employing be that example is described the specific embodiment of the present invention in detail.As shown in Figure 1, photoswitch (0S) 10 is selected N=2, with pixel live width 25um, and sum of all pixels 512, the special circumstances of measure spectrum scope 32nm are told about principle of the present invention.Light signal is by the selection of photoswitch (OS) 10, flashlight enters by in 12 to the 15 beam splitter groups of forming by input waveguide 11-2 earlier, the chromatic dispersion of beam splitter group partly is used to realize the apart of different wave length light signal, and wavelength optical signals focused on the diverse location of detection plane, promptly the beam splitter group makes the diverse location place of the signal focus of different wave length in detection plane 15.The spectral range of 32nm is measured with 512 pixels, and the wavelength resolution of each pixel is 0.0625nm, and both the resolution on the detection plane was 0.0625nm/25um.16 is several pixels of detector array among Fig. 1, and 1,2,3,4 is respectively the interface point between each pixel, supposes the wavelength value with this pixel representative of average expression of the wavelength value of two-end-point, then put 2 and the wavelength value of putting the pixel representative between 3 be λ c=(λ
2+ λ
3)/2.If when input waveguide 11-2 imports, the wavelength value of putting 2 places is λ, and the wavelength value of putting 3 places is λ+0.0625nm.Point 2 and the wavelength value of putting the pixel representative between 3 are λ+0.0313nm, and point 3 and the wavelength value of putting the pixel representative between 4 are λ+0.0938nm, and point 1 and the wavelength value of putting the pixel representative between 2 are λ-0.0313.The value of measuring pixel successively can obtain one group of wavelength data that resolution is 0.0625nm.
Switches light is opened the light and 10 is made light signal enter the beam splitter group from waveguide 11-1, equally, the spectrum of flashlight is according to the diverse location place of different wavelength focus in detection plane, because input waveguide 11-1 and 11-2 have an angle, spectral position when waveguide 11-1 imports and when waveguide 11-2 imports does not overlap, but the certain distance of translation, the size of translation distance is relevant with the angle between two input waveguides.In Fig. 1, the angle of adjusting two input waveguides makes whole spectrum translation 12.5um to the right, and in this process, and all other element holding position is motionless.When importing by 11-1 like this, point 2 wavelength value that original wavelength value is λ become λ-0.0313nm, the wavelength value at point 3 places becomes λ+0.0313nm, the wavelength value of other each point representative reduces 0.0313nm successively, like this when importing by waveguide 11-1, point 2 and the wavelength value of putting the pixel representative between 3 become λ, and point 1 and the wavelength value of putting the pixel representative between 2 are λ-0.0625nm, and point 3 and the wavelength value of putting the pixel representative between 4 are λ+0.0625nm.The wavelength measurement data that it is 0.0625nm that the value of measuring pixel successively can obtain other one group of wavelength resolution, in two groups of wavelength datas, the wavelength sampled value differs 0.0313nm.
Each wavelength data of measuring is stored in the data-carrier store after by the data acquisition unit collection, and after two groups of wavelength data measurements were finished, data processor got up according to the big wisp wavelength combinations of wavelength value.Be the wavelength measurement of 0.0625nm by two Sub-resos like this, just obtained one group of wavelength measurement data that wavelength resolution is 0.0313nm, resolution is doubled.
If N input waveguide arranged, angle each other is to make whole spectrum translation 0.0625/N nm on detection plane, just can obtain the original wavelength measurement data of N times of wavelength resolution raising like this by N time measurement.
Core spirit of the present invention is to measure different wavelength value respectively with same pixel.Similarly; by equally spaced rotating shutter such as accompanying drawing 2; or equally spaced mobile detector array such as accompanying drawing 3; modes such as the direction of equally spaced change incident angle such as Fig. 5 can realize the raising of wavelength resolution equally; its embodiment and principle and first kind of embodiment are basic identical; no longer describe in detail, but all belong to protection scope of the present invention.
Claims (7)
1. method that improves optical property monitor wavelength resolution, it is by light input end mouth input optical signal, be distributed on the array detection plane by the spectral space of chromatic dispersion beam splitter group partly light signal, by data processing section measurement data is analyzed and handled, it is characterized in that spectrum with light signal space distribution translation one segment distance successively on detection plane, the distance of translation is N/one of pixel live width, makes same pixel energy measure different wavelength value.
2. the method for raising optical property monitor wavelength resolution according to claim 1, it is characterized in that the employing of light input end mouth has the photoswitch that function is selected on the road, the N of a photoswitch output port links to each other with N input port of chromatic dispersion part, photoswitch is gating N input port successively, light signal is input to successively in N the input port of chromatic dispersion part, from different input port input optical signals, make whole spectrum translation one segment distance on detection plane by successively.
3. the method for raising optical property monitor wavelength resolution according to claim 1, it is characterized in that angle by the grating in the equally spaced rotation beam splitter group, control the corresponding segment distance of whole spectrum translation on detection plane, make same pixel energy measure different wavelength value.
4. the method for raising optical property monitor wavelength resolution according to claim 1 is characterized in that equally spaced mobile detector array, makes same pixel energy measure different wavelength value.
5. the method for raising optical property monitor wavelength resolution according to claim 1, N the input port that it is characterized in that the chromatic dispersion part has fixing angle each other, from different input port input optical signals, make whole spectrum translation one segment distance successively on detection plane by successively.
6. the method for raising optical property monitor wavelength resolution according to claim 1 is characterized in that translation 2-7 time successively on detection plane of spectrum with the light signal space distribution, makes same pixel energy measure 2-7 different wavelength value.
7. the method for raising optical property monitor wavelength resolution according to claim 2 is characterized in that photoswitch selects for use 2-7 input port of 2-7 output port and chromatic dispersion part to link to each other, and photoswitch is gating 2-7 input port successively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021156611A CN1178082C (en) | 2002-03-29 | 2002-03-29 | Method for improving wavelength resolution of optical performance monitor |
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| CNB021156611A CN1178082C (en) | 2002-03-29 | 2002-03-29 | Method for improving wavelength resolution of optical performance monitor |
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| CN1373350A CN1373350A (en) | 2002-10-09 |
| CN1178082C true CN1178082C (en) | 2004-12-01 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7133136B2 (en) * | 2003-10-22 | 2006-11-07 | Jds Uniphase Corporation | Wavelength monitor |
| CN101009519B (en) * | 2007-01-25 | 2010-09-01 | 中国科学院上海微系统与信息技术研究所 | A monitoring instrument for diffraction grating light signal with dual channel structure |
| US7852475B2 (en) * | 2007-08-13 | 2010-12-14 | Jds Uniphase Corporation | Scanning spectrometer with multiple photodetectors |
| CN103323123A (en) * | 2013-06-25 | 2013-09-25 | 长沙理工大学 | Full-automatic light wave length measuring method and device |
| CN103822713B (en) * | 2014-03-05 | 2016-08-17 | 中国科学院光电研究院 | A kind of optical spectrum imagers spectral resolution detection method and device |
| CN105890636B (en) * | 2015-10-13 | 2018-03-30 | 北京信息科技大学 | The optical fiber grating regulating system for improving spectral resolution is translated using slit |
| CN108225559A (en) * | 2015-10-14 | 2018-06-29 | 北京信息科技大学 | The optical fiber grating regulating system of spectral resolution is improved using fine motion grating |
| CN108387314A (en) * | 2015-10-14 | 2018-08-10 | 北京信息科技大学 | The fiber grating demodulation method of spectral resolution is improved using fine motion detector array |
| CN105890635B (en) * | 2015-10-14 | 2018-03-30 | 北京信息科技大学 | The optical fiber grating regulating system for improving spectral resolution is finely tuned using imaging lens |
| CN108593104B (en) * | 2018-03-30 | 2020-06-26 | 北京化工大学 | Small-size high SNR hand-held type spectrum detecting system |
| CN111189537A (en) * | 2020-01-07 | 2020-05-22 | 中国科学院武汉物理与数学研究所 | Device and method for simultaneously monitoring multi-channel and multi-type laser power |
| CN111947779A (en) * | 2020-07-28 | 2020-11-17 | 武汉光迅科技股份有限公司 | Optical signal detection system |
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2002
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Address after: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee after: Guangxun Science-Technology Co., Ltd., Wuhan Address before: 430074, No. 88, postal academy road, Hongshan District, Hubei, Wuhan Patentee before: Wuhan Guangxun Science and Technology Co., Ltd. |
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