CN101893507B - Spectral measurement method with large dynamic range and high resolution - Google Patents
Spectral measurement method with large dynamic range and high resolution Download PDFInfo
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- CN101893507B CN101893507B CN2009100841608A CN200910084160A CN101893507B CN 101893507 B CN101893507 B CN 101893507B CN 2009100841608 A CN2009100841608 A CN 2009100841608A CN 200910084160 A CN200910084160 A CN 200910084160A CN 101893507 B CN101893507 B CN 101893507B
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Abstract
The invention relates to a spectral measurement method with a large dynamic range and high resolution, which comprises the steps of sequentially connecting a tunable laser, a measured optical device and a spectrometer; setting the wavelength scanning range, the step length and the holding time of each wavelength of the tunable laser, and setting the wavelength range, the resolution and the scanning time of the spectrometer; carrying out the first scanning, and obtaining an overall spectrum of the measured optical device; selecting a detail of the spectrum which needs to be measured, using the start wavelength and the end wavelength of the detail to set the wavelength scanning range of the tunable laser, reducing the step length of the tunable laser to the required resolution, selecting the intermediate wavelength of the detail as the center wavelength of the spectrometer, and appropriately setting the resolution of the spectrometer; carrying out the second scanning, and recording optical power value which corresponds to teach wavelength of the tunable laser in the spectrometer; and establishing a rectangular coordinate system, taking the wavelength scanned by the tunable laser as a horizontal axis, taking optical power as a longitudinal axis, drawing the optical power which corresponds to each wavelength point by point, and obtaining the spectral information at the detail.
Description
Technical field
The present invention relates to the spectral measurement field, the method that this method adopts spectrometer and tunable laser to combine is through the comprehensive setting to tunable laser and each parameter of spectrometer, the spectral measurement that can realize having advantages such as great dynamic range and high resolving power.
Background technology
In fields such as optical fiber communication and Fibre Optical Sensors; Optical device such as optical filter, fiber grating extensively is used; Different demands corresponding dissimilar wave filter or gratings; Need phase-shifted grating like distributed feedback optical fiber laser, wavelength-division multiplex system need have the optical filter of specific wavelength and specific bandwidth etc.In these optical devices, there are some parameters relevant with wavelength, need carry out spectral measurement, such as the phase-shift phase relevant with wavelength, loss relevant or the like with wavelength.Wherein dynamic range and resolution are two key indexs of spectral measurement methods; Dynamic range is to be used to be illustrated under the given wavelength departure, the maximum luminous power difference that can measure, and dynamic range is big more; Help the accurately precipitous edge of measuring element spectrum more; Resolution is meant the minimum wavelength interval that can differentiate, and resolution is high more, helps measuring the spectral details of device more.
In the spectral measurement field of optical device, following three kinds of methods are arranged generally:
One, the method that adopts usually is the method that wideband light source and spectrometer combine; The rayed that just light emitted goes out from the broadband is on optical device, and transmitted light or reflected light are received by spectrometer, thereby realizes spectral measurement; This method is simple and convenient; But resolution and dynamic range are subject to spectrometer, and dynamic range is about 60dB, and resolution is about 0.01nm～0.06nm.
Two, a kind of comparatively common method is to adopt tunable laser to substitute wideband light source in addition; Tunable laser and spectrometer are realized spectral measurement through being provided with synchronously; This method has improved the dynamic range of spectral measurement, makes it reach 70dB～80dB, but since the employing of tunable laser and spectrometer be synchronous setting; So resolution still is subject to spectrometer, is about 0.01nm～0.06nm.
The method that three, can adopt tunable laser and light power meter to combine in addition, though can obtain high resolution, because light power meter is a broadband reception device, so dynamic range is less, generally between 30dB～60dB.
Summary of the invention
The technical matters that (one) will solve
In view of this, fundamental purpose of the present invention is to provide a kind of have simultaneously great dynamic range and high-resolution spectral measurement method, in order to obtain the more spectral information of details of optical device.
(2) technical scheme
For achieving the above object, the technical scheme that the present invention adopts is following:
A kind of have great dynamic range and a high-resolution spectral measurement method, and this method comprises:
With tunable laser, tested optical device is connected with spectrometer successively;
The wavelength scanning range of tunable laser is set, the retention time of step-length and each wavelength, the wavelength coverage of spectrometer, resolution and sweep time is set;
Tested optical device is carried out the scanning first time, obtain the integral light spectrogram of tested optical device;
Select the details place of required measure spectrum; Initial sum with the details place stops the wavelength scanning range that wavelength is provided with tunable laser; Reduce step-length to the needed resolution of tunable laser; Choose the centre wavelength of the middle wavelength at details place, and the resolution of spectrometer suitably is set as spectrometer;
Tested optical device is carried out the scanning second time, the corresponding optical power value of each wavelength of record tunable laser from spectrometer;
Set up rectangular coordinate system, the wavelength scanned with tunable laser is transverse axis, is the longitudinal axis with the luminous power, and the corresponding luminous power of each wavelength is drawn in pointwise, can obtain the spectral information at details place.
In the such scheme, the step-length of this tunable laser is adjustable with the retention time of each wavelength.
In the such scheme, the live width of this tunable laser should be less than step-length.
In the such scheme, the sweep time of this spectrometer need be smaller or equal to the retention time of each wavelength of tunable laser;
In the such scheme, the wavelength coverage at the details place of this required measurement need be smaller or equal to the resolution of spectrometer;
In the such scheme, this tested optical device can be Passive Optical Components or active optical component.
(3) beneficial effect
The invention has the advantages that; Overcome the restriction that can't take into account simultaneously in spectral measurement field great dynamic range and high resolving power; Can realize the dynamic range of 70dB～80dB, resolution measures the tiny characteristic at tested optical device details place smaller or equal to the measuring accuracy of 0.001nm.
Description of drawings
For further specifying concrete technology contents of the present invention, below in conjunction with instance and accompanying drawing the present invention is done a detailed description, wherein:
Fig. 1 is the process flow diagram with great dynamic range and high-resolution spectral measurement method provided by the invention;
Fig. 2 is according to the embodiment of the invention, the transmitted light spectrogram of the phase-shifted grating that records and the transmitted light spectrogram at details place;
Fig. 3 is the method that adopts wideband light source and spectrometer to combine, the transmitted light spectrogram of the phase-shifted grating that records;
Embodiment
Please with reference to Fig. 1, Fig. 1 is the process flow diagram with great dynamic range and high-resolution spectral measurement method provided by the invention, and this method may further comprise the steps:
Step 101: with tunable laser; Tested optical device is connected with spectrometer successively; The purpose that adopts tunable laser is in order to obtain having the detection light of high wavelength resolution and high-energy-density, and it has great dynamic range and high resolution spectral measuring that necessary condition is provided for obtaining to have;
Step 102: the wavelength scanning range that tunable laser is set; The retention time of step-length and each wavelength; The wavelength coverage of spectrometer is set, resolution and sweep time, the parameter of tunable laser and spectrometer is set reasonably; Can under the situation that guarantees measuring accuracy, effectively reduce and measure the required time;
Step 103: tested optical device is carried out first time scanning, obtain the integral light spectrogram of tested optical device, for the further details place of chosen spectrum provides foundation;
Step 104: the details place of selecting required measure spectrum; Initial sum with the details place stops the wavelength scanning range that wavelength is provided with tunable laser, reduces step-length to the needed resolution of tunable laser, chooses the centre wavelength of the middle wavelength at details place as spectrometer; And the resolution of spectrometer is set suitably; The parameter of tunable laser and spectrometer reasonably is set, can under the situation that guarantees measuring accuracy, effectively reduces and measure the required time;
Step 105: tested optical device is carried out the scanning second time, the corresponding optical power value of each wavelength of record tunable laser from spectrometer;
Step 106: set up rectangular coordinate system; With the scanned wavelength of tunable laser is transverse axis; With the luminous power is the longitudinal axis, and the corresponding luminous power of each wavelength is drawn in pointwise, can obtain the spectral information at details place; The combination of the spectrum that spectrum and the step 103 through the details place obtains can obtain the complete detailed spectral characteristic of measured device.
Please with reference to Fig. 2, Fig. 2 is according to the embodiment of the invention, the transmitted light spectrogram of the phase-shifted grating that records and the transmitted light spectrogram at details place, and embodiment specifically may further comprise the steps:
Step 1: tunable laser (agilent 81480A), phase-shifted grating is connected with spectrometer (andoAQ6317B) successively.
Step 2: the wavelength scanning range that tunable laser is set is 1529.1nm～1529.2nm, and step-length is 0.01nm, and the retention time of each wavelength is 1.5s; The wavelength coverage that spectrometer is set is 1529.1nm～1529.2nm, and resolution is that 0.01nm and sweep time are 1s, and it is 0.01nm that corresponding systemic resolution more than is set;
Step 3: tested optical device is carried out the scanning first time, obtain the integral light spectrogram of tested optical device, the track A among Fig. 2;
Step 4: the details place of selecting required measure spectrum; It is the zone between two vertical lines among Fig. 2; With the initial wavelength 1529.64nm at details place with stop the wavelength scanning range that wavelength 1529.68nm is provided with tunable laser; Reduce step-length to the needed resolution of tunable laser, the resolution that we select is 0.0005nm; The middle wavelength of choosing the details place is the centre wavelength of 1529.66nm as spectrometer; And the resolution that spectrometer is set is 0.05nm; At this moment the effect of spectrometer is equivalent to a light power meter that has wave filter; The resolution of system only depends on the step-length of tunable laser, is 0.0005nm;
Step 5: tested optical device is carried out the scanning second time, the corresponding optical power value of each wavelength of record tunable laser from spectrometer;
Step 6: set up rectangular coordinate system, the wavelength scanned with tunable laser is transverse axis, is the longitudinal axis with the luminous power, and the corresponding luminous power of each wavelength is drawn in pointwise, can obtain the spectral information at details place, the track B among Fig. 2.Because the resolution of system has improved 20 times, we have obtained to be hidden in the spectral details among the track A.
For the advantage of spectral measurement method provided by the invention is described, Fig. 3 has provided the method that adopts wideband light source and spectrometer to combine, the transmitted light spectrogram of the phase-shifted grating that records.Through with the contrast of Fig. 2, will find that spectral measurement method provided by the invention has significant superiority on resolution, and because the raising of dynamic range makes the precipitous edge of spectrum also be able to manifest.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. one kind has great dynamic range and high-resolution spectral measurement method, and this method comprises:
With tunable laser, tested optical device is connected with spectrometer successively;
The wavelength scanning range of tunable laser is set, the retention time of step-length and each wavelength, the wavelength coverage of spectrometer, resolution and sweep time is set;
Tested optical device is carried out the scanning first time, obtain the integral light spectrogram of tested optical device;
Select the details place of required measure spectrum; Initial sum with the details place stops the wavelength scanning range that wavelength is provided with tunable laser; Reduce step-length to the needed resolution of tunable laser; Choose the centre wavelength of the middle wavelength at details place, and the resolution of spectrometer suitably is set as spectrometer;
Tested optical device is carried out the scanning second time, the corresponding optical power value of each wavelength of record tunable laser from spectrometer;
Set up rectangular coordinate system, the wavelength scanned with tunable laser is transverse axis, is the longitudinal axis with the luminous power, and the corresponding luminous power of each wavelength is drawn in pointwise, can obtain the spectral information at details place.
2. according to claim 1 have great dynamic range and a high-resolution spectral measurement method, and wherein the retention time of the step-length of this tunable laser and each wavelength is adjustable.
3. according to claim 1 have great dynamic range and a high-resolution spectral measurement method, and wherein the live width of this tunable laser is less than step-length.
4. according to claim 1 have great dynamic range and a high-resolution spectral measurement method, and wherein the sweep time of this spectrometer is smaller or equal to the retention time of each wavelength of tunable laser.
5. according to claim 1 have great dynamic range and a high-resolution spectral measurement method, and wherein the wavelength coverage at the details place of this required measurement is smaller or equal to the resolution of spectrometer.
6. according to claim 1 have great dynamic range and a high-resolution spectral measurement method, and wherein this tested optical device is Passive Optical Components or active optical component.
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| CN2009100841608A CN101893507B (en) | 2009-05-20 | 2009-05-20 | Spectral measurement method with large dynamic range and high resolution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103674482A (en) * | 2012-09-17 | 2014-03-26 | 李朝晖 | Device and method for utilizing segmented spectral splicing technology to test passive optical device |
| CN103033205B (en) * | 2012-12-14 | 2016-04-20 | 张丽 | A kind of fiber Bragg grating (FBG) demodulator based on digitizing tunable optical source and demodulation method thereof |
| CN104792497B (en) * | 2015-03-25 | 2017-05-31 | 武汉光迅科技股份有限公司 | A kind of Spectrum testing systems of use tunable laser source |
| CN107270950B (en) * | 2017-07-03 | 2019-08-23 | 上海铁路通信有限公司 | A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system and method |
| CN109632690A (en) * | 2018-12-04 | 2019-04-16 | 孙彤 | Non-intrusion type urine on-line detecting system and the method for establishing prediction model |
| CN110082075B (en) * | 2019-05-28 | 2024-04-02 | 桂林市光明科技实业有限公司 | Ultra-high wavelength resolution passive optical device spectrum scanning device and method |
| CN111912815B (en) * | 2019-12-20 | 2023-03-14 | 南开大学 | Near infrared spectrum analysis method for evaluating quality of oil crops |
| CN111458023B (en) * | 2020-04-02 | 2021-05-25 | 华南理工大学 | High-speed large-dynamic-range spectral measurement method and system based on radio frequency coding |
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