CN2864649Y

CN2864649Y - Apparatus for calibrating and fitting tunable optical filter

Info

Publication number: CN2864649Y
Application number: CN 200620025199
Authority: CN
Inventors: 易小刚; 黄小玲
Original assignee: TIANJIN SHELLY INDUSTRIAL AUTOMATION ENGINEERING Co Ltd
Current assignee: TIANJIN SHELLY INDUSTRIAL AUTOMATION ENGINEERING Co Ltd
Priority date: 2006-01-20
Filing date: 2006-01-20
Publication date: 2007-01-31
Anticipated expiration: 2016-01-20

Abstract

The utility model discloses a device that is equipped with simple principle, compact structure, low cost and easy operation and that can calibrate and fit the tunable optical filters, consisting of light source, calibration branch, sensing branch and signal processing and control system; said calibration branch consists of F-P cavity type standard tool connected in series, Bragg grating and the first PIN photodiode; said sensing branch consists of the Bragg grating sensor array and the second PIN photodiode connected separately with the branch circulator; and said the first PIN photodiode and the second PIN photodiode are connected separately with the signal processing and control system. A splitter is equipped between the calibration branch and the sensor branch, and multi-path switches are equipped between the optical circulator and the sensor array and said the light source is SLD super-radiation diode or ASE broadband light source.

Description

Tunable optical filter is calibrated device with match

Technical field

The utility model relates to a kind of device that optical filter is detected, and relates in particular to a kind of device that tunable optical filter is detected.

Technical background

At optical communication, the light sensing has a wide range of applications in scientific research and other some optics industries tunable optical filter as a kind of crucial optical device.What more typically can be applied to sensor array on a large scale has Fabry-Perot cavate adjustable filter and an optical filter type adjustable filter.Because the principle of work of a lot of wave filters is based on mechanical type and moves, this just inevitably can produce the problem of relative error, i.e. multiplicity problem, and this brings great inconvenience to surveying work.Therefore, wave filter calibrated accurately with match be very important, at present, be badly in need of that research and development are a kind of can accurately calibrate device with match to tunable optical filter.

The utility model content

It is simple that the purpose of this utility model provides a kind of principle, and compact conformation is cheap, easy and simple to handle tunable optical filter calibrated device with match.

In order to solve the problems of the technologies described above, the device that the utility model is calibrated with match tunable optical filter is achieved with following technical proposals: comprise light source, calibration branch road, sensing branch road and signal controlling and disposal system; Described calibration branch road comprises F-P cavate etalon, Bragg grating and first PIN photodiode of series connection; Described sensing branch road comprises the Bragg grating type sensor array and second PIN photodiode that is connected with the branch road circulator respectively; Described first PIN photodiode is connected with disposal system with signal controlling respectively with described second PIN photodiode.

The utility model is calibrated device with match to tunable optical filter, wherein, be provided with shunt between described calibration branch road and the sensing branch road, be provided with multi-way switch between described light path circulator and the Bragg grating type sensor array, described light source is SLD super luminescence diode or ASE wideband light source.

Compared with prior art, the beneficial effects of the utility model are:

(1) the utility model is calibrated in the device with match tunable optical filter and has been used accurate F-P cavate etalon that the transmitted light wave of optical filter is calibrated, and its design concept is simple, compact conformation;

(2) the utility model is calibrated device with match to tunable optical filter and can be reached＜calibration accuracy of 20pm, can satisfy most of demand in market; And with low cost, can substitute expensive imported product, reduced cost widely.

Description of drawings

Fig. 1 has used the utility model tunable optical filter is calibrated fiber grating sensing system pie graph with the device of match;

Fig. 2 is the spectrum of light wave after transmiting F-P cavate etalon in the utility model.

Be the explanation of Reference numeral in the utility model Figure of description below:

1---light source 2---tunable optical filter 3---calibration branch road

31---F-P cavate etalon 32---Bragg grating 33---first PIN photodiode

4---shunt 5---sensing branch road 51---light path circulators

52---photoswitch 53---Bragg grating type sensor array 54---PIN photodiode

6---signal controlling and disposal system 7---ramp voltage

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.

As shown in Figure 1, the utility model is calibrated device with match to tunable optical filter, comprises light source 1, calibration branch road 3, sensing branch road 5 and signal controlling and disposal system 6; Described light source can adopt the SLD super luminescence diode, preferably adopts the ASE wideband light source; Described calibration branch road 3 comprises F-P cavate etalon 31, the Bragg grating 32 of series connection and leads to signal controlling and first PIN photodiode 33 of disposal system 6; Described sensing branch road 5 comprises Bragg grating type sensor array 53 that is connected with light path circulator 51 respectively and second PIN photodiode 54 of leading to signal controlling and disposal system 6, described light path circulator 51 is connected described signal controlling and disposal system 6 employing computer systems by multichannel photoswitch 52 with each sensor in the described Bragg grating type sensor array 53.

The course of work that adopts utility model that tunable optical filter is calibrated with match is:

By light source 1, promptly the high-energy light beam that sends of SLD super luminescence diode or ASE wideband light source is divided into two bundles after transmiting tunable optical filter 2, is admitted to calibration branch road 3 and sensing branch road 5 respectively.

Wherein, one road light beam is admitted to calibration branch road 3 by shunt 4 and calibrates and match, also claim " demarcation ", the principle and the process of its " demarcation " are: the transmission peak value wavelength of tunable optical filter 2 and the voltage positive correlation that is added in above it, add the ramp voltage 7 that an amplitude raises gradually for described tunable optical filter 2, can overlap with the transmission peak value wavelength that is serially connected in F-P cavate etalon 31 thereafter at the transmission peak value wavelength of described wave filter 2 sometime like this, at this moment, first PIN photodiode 33 can receive a light signal the strongest. and corresponding therewith, described first PIN photodiode 33 can be exported a electric signal the strongest, computer system is noted the amplitude of pairing ramp voltage 7 when first PIN photodiode, 33 output electric signal are maximum and the transmission peak value wavelength of corresponding F-P cavate etalon 31, obtain one group of magnitude of voltage and wavelength value thus, at last, after Computer signal control and disposal system match, obtain voltage-wavelength dependence about tunable optical filter 2;

Another road enters the light beam of sensing branch road 5, sends into Bragg grating type sensor array 53 by multichannel photoswitch 52; Enter PIN photodiode 54 after by 53 reflections of Bragg grating type sensor array, described PIN photodiode light beam 54 pairs of reflected backs, that carry customizing messages carries out record;

At last, according to voltage-wavelength dependence that above-mentioned calibration branch road 3 obtains the information that second PIN photodiode 54 is write down is carried out data analysis with disposal system 6 by Computer signal control; And then demodulate the wavelength value of each sensor in the Bragg grating type sensor array 53, so far finished the calibration and the fit procedure of tunable optical filter 2.

Dotted portion among Fig. 2 is owing to be connected in series the cause of a Bragg grating 32 behind the F-P cavate etalon 31, the reflection wavelength of Bragg grating 32 is fixed on certain position (such as 1550nm), requiring this position also is the position of certain transmission peak value of F-P cavate etalon 31, because Bragg grating 32 can reflect the light of specified wavelength, that is to say, it can reflect away the peak of F-P cavate etalon 31 corresponding sections, can form one on the spectrogram shown in dotted portion among Fig. 2 " breach " thus, because the reflection wavelength of described Bragg grating 32 is a known wavelength, therefore according to " breach " position among Fig. 2, can obtain the peak wavelength at each peak on the spectrogram.

Although in conjunction with the accompanying drawings preferred embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away under the scope situation that the utility model aim and claim protect, can also make a lot of forms, these all belong within the protection of the present utility model.

Claims

1. one kind tunable optical filter calibrated device with match, comprise light source, calibration branch road and sensing branch road, it is characterized in that described calibration branch road comprises F-P cavate etalon, Bragg grating and first PIN photodiode of series connection; Described sensing branch road comprises the Bragg grating type sensor array and second PIN photodiode that is connected with the light path circulator respectively; Described first PIN photodiode is connected with signal controlling and disposal system respectively with described second PIN photodiode.

2. according to claim 1 tunable optical filter is calibrated device with match, wherein, be provided with shunt between described calibration branch road and the sensing branch road.

3. according to claim 1 tunable optical filter is calibrated device with match, wherein, be provided with the multichannel photoswitch between described light path circulator and the Bragg grating type sensor array.

4. according to claim 1 tunable optical filter is calibrated device with match, wherein, described light source adopts the SLD super luminescence diode.

5. according to claim 1 tunable optical filter is calibrated device with match, wherein, described light source adopts the ASE wideband light source.