CN102751656B - System and method for monitoring side-mode suppression ratio and channel stability of tunable laser - Google Patents
System and method for monitoring side-mode suppression ratio and channel stability of tunable laser Download PDFInfo
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Abstract
The invention discloses a system and a method for monitoring side-mode suppression ratio and channel stability of a tunable laser and relates to the device and the method for monitoring the dominant frequency and side-mode power of the laser through a sampling etalon to judge spectral quality and channel stability of the laser so as to carry out effective control. The monitoring system disclosed by the invention mainly comprises the tunable laser composed of a gain medium, a coupling optical part, a fixed lattice filter, a tunable filter and a reflective optical part, a beam collimation lens, an opto-isolator, a beam splitter component, an F-P (fabry-Perot) etalon, an optical detector, a coupling output lens, a controller, etc. Through a plurality filters outside a laser cavity and a photoelectric detection structure, wavelength lock is carried out; the spectral quality is evaluated; the tunable filter is timely adjusted and controlled; the lasing wavelength is stabilized in the required channel all the time, and good enough spectral quality is achieved. The monitoring system is suitable for online spectral quality monitoring in work of the laser and possible drift correction resulting from switching of the filter inside the cavity.
Description
Technical field
The present invention relates to a kind of multichannel tunable laser characteristic supervisory control system and method for supervising.Particularly relate to a kind of outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system and method.
Background technology
Tunable laser is one of Primary Component in optical communication network, the advanced modulation demodulation mode adopting in New Generation Optical network, especially phase-modulation coherent demodulation mode is that narrow linewidth characteristic has had higher requirement to the low phase noise characteristic of tunable laser, for tackling this development trend, in recent years, the scheme of various new narrow linewidth tunable lasers just continues to bring out, and some progressively enters practical field.
In the middle of numerous technical schemes, include the tandem integration mode that semiconductor grating is selected, laser array integration mode, micro-resonant ring mode and external-cavity semiconductor laser mode etc.Although semiconductor integrated technology has many quite attractive tunable laser schemes, yet the huge apparatus with respect to semiconductor integrated technique technology drops into, complicated technology method and low rate of finished products, relatively ripe and simple outside cavity gas laser technology is still had an optimistic view of by industry.In fact the record of outside cavity gas laser research in existing many years and use, it is used widely in coherent optical detection technical field with its excellent narrow linewidth characteristic all the time.Outside cavity gas laser is mainly used in the fields such as scientific research such as optical sensing and spectroscopy before, these outside cavity gas lasers generally only have very limited adjustable range, development along with technology, particularly be subject to the huge promotion of dwdm optical communication system applies demand, development wide-band tuning outside cavity gas laser has become the hot topic in this field, and the broadband tunable laser scheme of existing multiple employing outer-cavity structure is suggested and is implemented recently.
Yet outer cavity adjustable laser also has an obvious shortcoming, what be easily subject to various factors affects generation mode hopping, thereby causes the deteriorated of laser characteristics, and suppressing mode hopping is a complicated technology that must solve in the practical process of outer cavity adjustable laser.The technology of the inhibition mode hopping proposing for the outer cavity adjustable laser of various different structures is of a great variety, in fact being summed up is still exactly monitoring and the compensation technique departing from for amplitude or phase condition, so the condition monitoring of outer cavity adjustable laser and online adjustment are a very important job.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of and judge laser spectrum quality and stability of channel by sampling standard tool monitoring laser dominant frequency and limit mould power thereof, thereby the extenal cavity tunable laser device status monitoring controling effectively is exactly outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system and the method for extenal cavity tunable laser device side mode suppression ratio and stability of channel monitoring specifically.
The technical solution adopted in the present invention is: a kind of outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system, by the light splitting outside a chamber, filtering and optical power detection apparatus and laser drive control device, realize laser spectroscopy side mode suppression ratio timely monitor and stability of channel monitoring, include external-cavity semiconductor laser and chamber external spectrum quality detecting system two parts, concrete formation is: the reflection optics setting gradually along light path, tunable filter, fixed-grid filter, collimating lens in chamber, semiconductor optical amplifier, collimating lens outside chamber, optical isolator, the first spectroscope and output coupled lens, and the laser beam that the first spectroscope is separated is separated into the second spectroscope of the 5 bundle laser light that intensity is equal successively, the 3rd spectroscope, the 4th spectroscope, the 5th spectroscope and speculum, respectively the first sampling standard tool on the corresponding transmission path that is arranged on laser beam, the second sampling standard tool, the 3rd sampling standard tool and the 4th sampling standard tool, be used for respectively the corresponding first sampling standard tool that receives, the second sampling standard tool, the first photodetector of the 3rd sampling standard tool and the 4th sampling standard tool light splitting output, the second photodetector, the 3rd photodetector and the 4th photodetector, and the 5th photodetector that receives the laser of speculum output, be also provided with controller, and described controller receives external control order, gathers from the first photodetector, the second photodetector, the 3rd photodetector, the signal of the 4th photodetector and the 5th photodetector also carries out side mode suppression ratio according to sampling configuration requirement and calculates and stability of channel analysis, described controller connects described semiconductor optical amplifier and tunable filter by output interface, for refreshing in time calculating and analysis result and driving as required semiconductor optical amplifier and tunable filter.
Described fixed-grid filter is the device of Fabry-Perot etalon or other generation periodicity grid filtering channel.
Described tunable filter is a continuously adjustable wavelengthtunable selector in passband center.
The 4th described sampling standard tool, the first photodetector and the 5th photodetector are for wavelength locking; The first described sampling standard tool, the second sampling standard tool, the 3rd sampling standard tool, the second photodetector, the 3rd photodetector and the 4th photodetector are for laser spectroscopy quality testing.
The Free Spectral Range of the first described sampling standard tool, the second sample etalon, the 3rd sampling standard tool is three times of described fixed-grid filter wavelength interval.
Between the transmission spectrum peak of the first described sampling standard tool, the second sampling standard tool and the 3rd sampling standard tool, differ successively a distance identical with the Free Spectral Range size of described fixed-grid filter.
The 4th described sampling standard tool has identical Free Spectral Range with described fixed-grid filter.
A kind of method for supervising for outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system, all wavelengths passage is weaved into 3 groups, by shortwave, to long wave, interleave sequence, corresponding the first sampling standard tool of each wavelength channel group and the second photodetector, in three groups of the second sampling standard tool and the 3rd photodetector and the 3rd sampling standard tool and the 4th photodetectors two groups, due to the first sampling standard tool, the second sampling standard tool, the special Free Spectral Range configuration of the 3rd sampling standard tool, make the adjacent two passage luminous powers of corresponding with each wavelength channel two photodetector sampled values and service aisle corresponding, thereby the symmetry that realizes timing monitoring spectrum is the object of side mode suppression ratio.
Specific implementation is: first, extenal cavity tunable laser device is selected a passage job according to system requirements, opens specific wavelength Laser output, the information gathering of the wavelength locker forming according to the 4th sampling standard tool, the 5th photodetector and the first photodetector, computational analysis provides passage and whether exports normal information and implement closed-loop control, guarantees that laser works is at correct specific wavelength passage, when specific wavelength work is opened and be stabilized in to extenal cavity tunable laser device, controller provides sampling channel grouping information according to specific wavelength channel information, the collection of adjacent channel luminous power will mask the second photodetector pointedly, some output in the 3rd photodetector and the 4th photodetector, and automatically the output of two other optical power detector is wherein denoted as to adjacent or right neighbour's luminous power inspection sampling in the vicinity, start computational analysis, first be by calculating in the vicinity adjacent or right neighbour's luminous power with respect to the ratio of total Output optical power, obtain the numerical value of side mode suppression ratio, in addition by calculating in the vicinity adjacent luminous power with respect to the ratio of right neighbour's luminous power, provide spectrum symmetry data, if this ratio exceeds certain predetermined threshold value, point out spectrum symmetry to exceed standard, while output symmetry directional information, actually or the high right neighbour's power of adjacent power is high in the vicinity, according to the spectrum symmetry Output rusults that exceeds standard, especially asymmetrical directional information, starts the tunable filter in laser cavity by controller, and fine setting tunable filter also continues by above-mentioned method monitoring spectrum symmetry, until satisfied, realize a kind of spectrum symmetry of closed loop and control.
Outer cavity adjustable laser side mode suppression ratio of the present invention and stability of channel supervisory control system and method, proposed a kind of by monitoring laser signal side mode suppression ratio and spectrum symmetry, proofread and correct the method that outer cavity adjustable laser drives and controls in good time, guarantee the second best in quality while of spectral signal, also the amplitude condition of having avoided device property drift to cause departs from, and realizes stable laser characteristics.The present invention is by adopting the F-P etalon of one group of particular arrangement and the electro-optical system that corresponding photoelectricity receives and signals collecting is calculated thereof, monitoring extenal cavity tunable laser device adjacent channel swashs the small drift of penetrating tunable filter centre wavelength in state timing monitoring laser exocoel, and compensate and eliminate this drift by FEEDBACK CONTROL tunable filter method, guarantee that laser is without stability and the signal quality of mode hopping work; By special filtering processing and luminous power to laser signal, detect, monitoring laser signal limit mould symmetry, especially the luminous power of adjacency channel size, penetrate state, and feedback adjusting realizes the object of in good time characteristic optimizing thereby analytic signal side mode suppression ratio and monitoring adjacency channel swash.
Accompanying drawing explanation
Fig. 1 (a) is that tunable filter center and Periodic filter passband center are to punctual passband spectrum schematic diagram;
Fig. 1 (b) is the passband spectrum schematic diagram of tunable filter center while occurring to drift about to long wave direction;
Fig. 1 (c) is the passband spectrum schematic diagram of tunable filter center while occurring to drift about to shortwave direction;
Fig. 2 is that the extenal cavity tunable laser device with chamber external spectrum quality detecting system of the present invention forms schematic diagram
Fig. 3 is the formation block diagram of middle controller of the present invention;
Fig. 4 is the corresponding relation curve chart of each sampling standard tool transmission peaks in each output channel of tunable laser and chamber external spectrum detection system;
Fig. 5 is the control flow chart that the locking of tunable laser channel wavelength and spectral quality detect;
In figure:
A: side mode suppression ratio
1: semiconductor optical amplifier 2: collimating lens in chamber
3: fixed-grid filter 4: tunable filter
5: anacamptics part 6: collimating lens outside chamber;
7: 8: the first spectroscopes of optical isolator
10: the three spectroscopes of 9: the second spectroscopes
12: the five spectroscopes of 11: the four spectroscopes
13: the six spectroscopes 14: output coupled lens
15: 16: the four sampling standard tools of laser beam
18: the second sampling standard tools of 17: the three sampling standard tools
20: the five photodetectors of 19: the first sampling standard tools
22: the three photodetectors of 21: the four photodetectors
24: the first photodetectors of 23: the second photodetectors
25,26,27,28,29: laser beam 30: controller
30-1: microcontroller 30-2: multi-path light power signal Acquisition Circuit
30-3: drive circuit for laser 30-4: input/output interface
Embodiment
Below in conjunction with embodiment and accompanying drawing, outer cavity adjustable laser side mode suppression ratio of the present invention and stability of channel supervisory control system and method are described in detail.
Outside cavity gas laser has many resonator modes, and enabling single mode operation method is in chamber, to add narrowband light filter, and extenal cavity tunable laser device is realized tuning by the adjustable narrow-band filter in chamber.Fig. 1 has provided transmitted spectrum and the chamber mould position view of tunable filter part and period grid filtering device in extenal cavity tunable laser device, if A1 in Fig. 1 (a) is the transmission spectrum of period grid filter, A2 is the transmission spectrum of tunable filter, and A3, A4, A5 are cavity modes.In Fig. 1 (a), when A2 and A1 peak value are on time, the loss of limit mould A4 and A5 is suitable, and now side mode suppression ratio is the highest, and spectrum, as B1 shape, forms and has higher symmetric figure.And when skew occurs the two peak value aligned position, when drift occurs A2, in Fig. 1 (b), the relative A211 of A21 drifts about to long wave direction, the now loss of A41 is greater than A51, and side mode suppression ratio reduces, and spectrum is as B2 shape, become asymmetric figure, spectral quality occurs deteriorated; The relative A222 of A22 is to the drift of shortwave direction in Fig. 1 (c), and the now loss of A52 is greater than A42, and now side mode suppression ratio reduces, and spectrum becomes asymmetric figure as B3 shape, similar to Fig. 1 (b) situation.Therefore, by recording separately the luminous power of the small peak in main peak left side in the small peak on main peak right side in spectrum B2 and spectrum B3, add the calibration factor of total optical power, just can obtain on the one hand the side mode suppression ratio of laser, judge on the other hand symmetry or the drift bearing of tunable filter.
As shown in Figure 2, outer cavity adjustable laser side mode suppression ratio of the present invention and stability of channel supervisory control system, be by the light splitting outside a chamber, filtering and optical power detection apparatus and laser drive control device, realize laser spectroscopy side mode suppression ratio timely monitor and stability of channel monitoring, include external-cavity semiconductor laser and chamber external spectrum quality detecting system two parts, concrete formation is: the anacamptics part 5 setting gradually along light path, tunable filter 4, fixed-grid filter 3, in chamber, collimating lens 2, semiconductor optical amplifier 1, outside chamber, collimating lens 6, optical isolator 7 and the first prism 8, be also provided with the output coupled lens 14 that receives the first prism 8 output light, and the laser beam 15 that the first spectroscope 8 is separated is separated into 5 bundle laser beams 25 successively, 26, 27, 28, the second spectroscope 9 of 29, the 3rd spectroscope 10, the 4th spectroscope 11, the 5th spectroscope 12 and the 6th spectroscope 13, correspondence is arranged on laser beam 25 respectively, laser beam 26, the first sampling standard tool 19 on the transmission path of laser beam 27 and laser beam 28, the second sampling standard tool 18, the 3rd sampling standard tool 17 and the 4th sampling standard tool 16, be used for respectively the corresponding first sampling standard tool 19 that receives, the second sampling standard tool 18, the first photodetector 24 of the 3rd sampling standard tool 17 and the 4th sampling standard tool 16 output light, the second photodetector 23, the 3rd photodetector 22 and the 4th photodetector 21, and the 5th photodetector 20 that receives the 6th spectroscope 13 output light, be also provided with controller 30, and the signal input part of described controller 30 connects respectively the first photodetector 24, the second photodetector 23, the 3rd photodetector 22, the 4th photodetector 21 and the 5th photodetector 20, the signal output part of described controller 30 connects described semiconductor optical amplifier 1, tunable filter 4 and other parts.
Described fixed-grid filter 3 is devices of Fabry-Perot etalon or other generation periodicity grid filtering channel, for for dense wave division multipurpose Dense wavelength division multiplexing, the situation of dwdm system, corresponding ITU-T specified standard DWDM of this cycle interval, as 25GHz, 50GHz, 100GHz or 200GHz.
Described the 4th sampling standard tool 16, the first photodetector 24 and the 5th photodetector 20 are for realizing wavelength locking function, for providing when prepass precision information; Described the first sampling standard tool 19, the second sampling standard tool 18, the 3rd sampling standard tool 17, the second photodetector 23, the 3rd photodetector 22 and the 4th photodetector 21 are for laser spectroscopy quality testing.
As shown in Figure 3, described controller 30 comprises: microcontroller (single-chip microcomputer), multi-path light power signal Acquisition Circuit, drive circuit for laser (comprising the driving of semiconductor optical amplifier 1 and the driving of tunable filter 4) and input/output interface circuit etc.
As shown in Figure 4, the Free Spectral Range of the 4th described sampling standard tool 16 is identical with the wavelength interval of fixed-grid filter 3; The Free Spectral Range of the first sampling standard tool 19, the second sampling standard tool 18 and the 3rd sampling standard tool 17 is three times of described fixed-grid filter 3 wavelength intervals, and described the first sampling standard tool 19, the second sampling standard tool 18 and the 3rd sampling standard tool 17 differ the free spectrum interval of a fixed-grid filter 3 successively.
Described controller 30 comprises as shown in Figure 3: microcontroller 30-1 and the drive circuit for laser 30-3 being connected with microcontroller 30-1 respectively, multi-path light power signal Acquisition Circuit 30-2 and input/output interface 30-4, described multi-path light power signal Acquisition Circuit 30-2 connects respectively the first photodetector 24, the second photodetector 23, the 3rd photodetector 22, the 4th photodetector 21 and the 5th photodetector 20, and described drive circuit for laser 30-3 connects respectively tunable filter 4 and semiconductor optical amplifier 1.
In above-mentioned extenal cavity tunable laser device side mode suppression ratio and stability of channel supervisory control system, described semiconductor optical amplifier 1, in chamber, collimating lens 2, fixed-grid filter 3, tunable filter 4, anacamptics part 5, outside chamber, collimating lens 6, optical isolator 7, the first prism 8 and output coupled lens 14 form external-cavity semiconductor laser, the first described Amici prism 8, the second prism 9, prism 10, the 4th prism 11, pentaprism 12, the 6th prism 13, the first sampling standard tool 19, the second sampling standard tool 18, the 3rd sampling standard tool 17, the 4th sampling standard tool 16, the first photodetector 24, the second photodetector 23, the 3rd photodetector 22, the 4th photodetector 21 and the 5th photodetector 20 form chamber external spectrum quality detecting system.
In external-cavity semiconductor laser, when choosing (aligning) a certain grid, the transmission peaks of tunable filter 4 realizes the Laser output of this passage, fixed-grid filter 3 can be that etalon or other can be realized the filter of fixed frequency interval filtering, and tunable filter 4 is movably wavelengthtunable selectors of centre wavelength, anacamptics part 5 can be fixing or transportable speculum; In the external spectrum quality detecting system of chamber, the first Amici prism 8, the second spectroscope 9, the 3rd spectroscope 10, the 4th spectroscope 11, the 5th spectroscope 12, the 6th spectroscope 13 are distributed to each sense channel by the sampling of laser Output of laser; Sampling standard tool 19, the first photodetector 24 and the 5th photodetector 20 are realized wavelength locking function; Sampling standard tool 16,17,18 and photodetector 21,22,23 are realized laser spectroscopy quality testing function.
Method for supervising for outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system of the present invention, is achieved in that
1, the spectrum of extenal cavity tunable laser device includes the composition of adjacent channel conventionally, and the limit mould of spectrum is mainly the luminous power contribution of two the arest neighbors passages in left and right, adopt special optical filter and combination thereof to use, realize the luminous power independent detection of the right two neighbour's passages of Dui Zuo ﹑, thereby can passing threshold comparison with whether the luminous power of the Zuo ﹑ right side two the neighbour's passages in methods analyst left and right relatively exceeds standard and left and right balance whether, reach the object of monitor signal limit mould symmetry and spectrum side mode suppression ratio;
2, sampling standard tool is a kind of period grid filtering device, its Free Spectral Range is three times of described outer cavity adjustable laser fixed-grid filter, when tunable laser works in certain ITU-T passage, in the passband of this optical filter, only there is an arest neighbors passage just in time aiming at this ITU-T passage, the right, the left side, two this special light filters that use by pairing extract respectively the optical signal power of service aisle neighbour two passages, and are converted to the signal of telecommunication by photo-detector below;
3, for the concrete condition of different I TU-T passage work, will detect respectively the optical signal power of neighbour's two passages only cannot be competent at by this sampling standard tool of two pairing uses, can be by this sampling standard tool that adopts three to avoid the peak hour respectively, combination of two, for different I TU-T passage, realizes the object to the optical signal power difference determination and analysis of whole passage neighbour two passages;
4, except providing the signal partial wave of composite sampling etalon and photo-detector thereof, the detection of luminous power in total Output optical power and ITU-T service aisle is also provided, to monitor optical power stability and normative reference be provided, the luminous power size passing threshold (luminous power in passage) of right two passages of service aisle Zuo ﹑ is compared with Zuo ﹑ right side method relatively, whether the luminous power that judges two neighbour's passages exceeds standard and left and right balance whether, the luminous power of two neighbour's passages exceeds standard and shows that side mode suppression ratio is defective, left and right imbalance has reflected that in exocoel, the center of tunable optical filter drifts about to a certain degree, can make it rationally to be revised by a kind of closed-loop fashion fine setting tunable optical filter, guarantee signal quality.
In order to realize the limit mould luminous power in independent detection laser spectrum right side and left side and to estimate the object of side mode suppression ratio, first make several presupposition, (1) laser spectroscopy limit mould is mainly contributed by the luminous power of DWDM adjacent channel position, (2) with respect to arest neighbors, inferior neighbour and the farther interior luminous power of passage can be ignored, (3) the transmission passband spectrum of tunable filter has perfect symmetry structure, obviously in actual conditions more than 3 meet.Fig. 4 has shown the corresponding relation of each output channel of tunable laser and each etalon optical filter transmission peaks of chamber external spectrum detection system, first the output channel of tunable laser is divided into α by the form of interleaving, β, tri-groups of δ, select the frequency interval of the first sampling standard tool 19 in the external spectrum detection system of chamber all consistent with laser channels interval and centre wavelength with transmission peaks center, and the 4th sampling standard tool 16, the frequency interval of the 3rd sampling standard tool 17 and the second sampling standard tool 18 is three times in the channel spacing of laser, its transmission peaks respectively with above-mentioned α, tri-groups of output channel centre wavelengths of β and δ are corresponding, from diagram, when laser is output as specific wavelength, such as take, to belong to certain specific wavelength in α group be example, now the first sampling standard tool 19 and the first photodetector 24 and the 5th photodetector 20 form a wavelength locker, it is emphasized that: the rising edge of the first sampling standard tool 19 spectral band-widths or trailing edge alignment work channel center wavelength can be realized Wavelength-tracking lock function, the first photodetector 24 also provides total Output optical power normative reference simultaneously, now by the luminous power at arest neighbors passage place, the exportable service aisle of the second sampling standard tool 18 right side, and by the luminous power at the 3rd arest neighbors passage place, sampling standard tool 17 exportable service aisle left side, this is all just to set up under the prerequisite of ignoring other neighbour's passage contribution certainly, due to periodic reason, in α group, all wavelengths passage is all like this, and therefore the 3rd sampling standard tool 17, the second sampling standard tool 18 and the 3rd photodetector 22 below thereof and the second photodetector 23 have formed the left and right arest neighbors passage luminous power measuring ability part for α group service aisle.By that analogy, situation for two groups of β and δ, identical with α group with the function of gross output reference with the 5th photodetector 20 wavelength locking of formation based on the first sampling standard tool 19 and the first photodetector 24, wherein β organizes a left side for service aisle, right arest neighbors passage luminous power measuring ability part is by the second sampling standard tool 18, the 4th sampling standard tool 16 and the second photodetector 23 below thereof, the 4th photodetector 21 forms, and a left side for δ group service aisle, right arest neighbors passage luminous power measuring ability part is by the 4th sampling standard tool 16, the 3rd sampling standard tool 17 and the 4th photodetector 21 below thereof, the 3rd photodetector 22 forms.
In concrete work, laser controller belongs to α by service aisle validation of information when prepass, and then which group in tri-groups of β and δ determines to gather the output information of which optical power detector when calculating side mode suppression ratio.
As shown in Figure 4, method for supervising for outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system of the present invention is, all wavelengths passage is weaved into 3 groups, by shortwave, to long wave, interleave sequence, corresponding the 4th sampling standard tool 16 of each wavelength channel group and the 4th photodetector 21, in 23 3 groups of the 3rd sampling standard tool 17 and the 3rd photodetector 22 and the second sampling standard tool 18 and the second photodetectors two groups, due to the 4th sampling standard tool 16, the special Free Spectral Range configuration of the 3rd sampling standard tool 17 and the 4th sampling standard tool 18, two photodetector sampled values that while making each wavelength channel work, correspondence is chosen are corresponding with the luminous power at the adjacent two passage places of service aisle, the symmetry that realizes timing monitoring spectrum is the object of side mode suppression ratio, simultaneously, due to can the adjacent two passage optical power change situations of timely monitor, for the off-centring of the inner tunable optical filter of the outside cavity gas laser causing because of all factors, thereby cause the increase of adjacency channel luminous power also can play monitoring effect, realize in good time stability of channel monitoring, outer cavity adjustable laser controller, according in good time stability of channel monitoring result, is adjusted the tunable filter in laser chamber if desired, makes passage all-the-time stable at satisfied state.
As shown in Figure 5, method for supervising for outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system of the present invention, specific implementation is: first, extenal cavity tunable laser device is selected a passage job according to system requirements, opens specific wavelength Laser output; The information gathering of the wavelength locker consisting of the first sampling standard tool 19, the first photodetector 24 and the 5th photodetector 20 and computational analysis provide passage and whether export normal information, and common this method is that locking spectrum peak is at expected range; The same Time Controller 30 that extenal cavity tunable laser device is opened specific wavelength provides service aisle grouping information, the collection of adjacent channel luminous power will mask some output in the second photodetector 23, the 3rd photodetector 22 and the 4th photodetector 21 (for that of service aisle) pointedly, and automatically the output of two other optical power detector is wherein denoted as to adjacent or right neighbour's luminous power detection limit in the vicinity; After the work of the wavelength locker consisting of the first sampling standard tool 19, the first photodetector 24 and the 5th photodetector 20 reaches steadily (wavelengths centered meets the demands), start computational analysis, first, the one, by calculating adjacent or right neighbour's luminous power in the vicinity, with respect to the ratio of total Output optical power, obtain the numerical value of side mode suppression ratio; In addition by calculating in the vicinity adjacent luminous power with respect to the ratio of right neighbour's luminous power, provide spectrum symmetry data, if this ratio exceeds certain predetermined threshold value, point out spectrum symmetry to exceed standard, while output symmetry directional information, actually or the high right neighbour's power of adjacent power is high in the vicinity; According to the spectrum symmetry Output rusults that exceeds standard, especially asymmetrical directional information, the passage starting in laser cavity by controller adjustment switches tunable filter, finely tune tunable filter and monitor the symmetric operation of spectrum, until satisfied, realize a kind of spectrum symmetry of closed loop and control.
Claims (9)
1. outer cavity adjustable laser side mode suppression ratio and a stability of channel supervisory control system, is characterized in that, by the light splitting outside a chamber, filtering and optical power detection apparatus and laser drive control device, realize laser spectroscopy side mode suppression ratio timely monitor and stability of channel monitoring, include external-cavity semiconductor laser and chamber external spectrum quality detecting system device two parts, concrete formation is: the reflection optics setting gradually along light path (5), tunable filter (4), fixed-grid filter (3), collimating lens in chamber (2), semiconductor optical amplifier (1), collimating lens outside chamber (6), optical isolator (7), the first spectroscope (8) and output coupled lens (14), and the laser beam (15) that the first spectroscope (8) is separated is separated into the 5 bundle laser light (25 that intensity equates successively, 26, 27, 28, 29) the second spectroscope (9), the 3rd spectroscope (10), the 4th spectroscope (11), the 5th spectroscope (12) and speculum (13), correspondence is arranged on laser beam (25 respectively, 26, 27, 28) the first sampling standard tool (19) on transmission path, the second sampling standard tool (18), the 3rd sampling standard tool (17) and the 4th sampling standard tool (16), be used for respectively the corresponding first sampling standard tool (19) that receives, the second sampling standard tool (18), first photodetector (24) of the 3rd sampling standard tool (17) and the 4th sampling standard tool (16) light splitting output, the second photodetector (23), the 3rd photodetector (22) and the 4th photodetector (21), and the 5th photodetector (20) that receives the laser of speculum (13) output, also be provided with controller (30), described controller (30) receives external control order, gathers from the first photodetector (24), the second photodetector (23), the 3rd photodetector (22), the signal of the 4th photodetector (21) and the 5th photodetector (20) also carries out side mode suppression ratio according to sampling configuration requirement and calculates and stability of channel analysis, described controller (30) connects described semiconductor optical amplifier (1) and tunable filter (4) by output interface, for refreshing in time calculating and analysis result and driving as required semiconductor optical amplifier (1) and tunable filter (4).
2. outer cavity adjustable laser side mode suppression ratio according to claim 1 and stability of channel supervisory control system, is characterized in that, described fixed-grid filter (3) is the device of Fabry-Perot etalon or other generation periodicity grid filtering channel.
3. outer cavity adjustable laser side mode suppression ratio according to claim 1 and stability of channel supervisory control system, is characterized in that, described tunable filter (4) is a continuously adjustable wavelengthtunable selector in passband center.
4. outer cavity adjustable laser side mode suppression ratio according to claim 1 and stability of channel supervisory control system, it is characterized in that, the first described sampling standard tool (19), the first photodetector (24) and the 5th photodetector (20) are for wavelength locking; The second described sampling standard tool (18), the 3rd sampling standard tool (17), the 4th sampling standard tool (16), the second photodetector (23), the 3rd photodetector (22) and the 4th photodetector (21) are for laser spectroscopy quality testing.
5. outer cavity adjustable laser side mode suppression ratio according to claim 1 and stability of channel supervisory control system, it is characterized in that, the Free Spectral Range of the second described sampling standard tool (18), the 3rd sampling standard tool (17), the 4th sampling standard tool (16) is three times of described fixed-grid filter (3) wavelength interval.
6. outer cavity adjustable laser side mode suppression ratio according to claim 1 and stability of channel supervisory control system, it is characterized in that, between the transmission spectrum peak of the second described sampling standard tool (18), the 3rd sampling standard tool (17), the 4th sampling standard tool (16), differ successively a distance identical with the Free Spectral Range size of described fixed-grid filter (3).
7. outer cavity adjustable laser side mode suppression ratio according to claim 1 and stability of channel supervisory control system, is characterized in that, the first described sampling standard tool (19) has identical Free Spectral Range with described fixed-grid filter (3).
8. the method for supervising for outer cavity adjustable laser side mode suppression ratio claimed in claim 1 and stability of channel supervisory control system, it is characterized in that, all wavelengths passage is weaved into 3 groups, by shortwave, to long wave, interleave sequence, corresponding the second sampling standard tool (18) of each wavelength channel group and the second photodetector (23), in (21) three groups of the 3rd sampling standard tool (17) and the 3rd photodetector (22) and the 4th sampling standard tool (16) and the 4th photodetectors two groups, due to the second sampling standard tool (18), the 3rd sampling standard tool (17), the special Free Spectral Range configuration of the 4th sampling standard tool (16), make the adjacent two passage luminous powers of corresponding with each wavelength channel two photodetector sampled values and service aisle corresponding, thereby the symmetry that realizes timing monitoring spectrum is the object of side mode suppression ratio.
9. the method for supervising for outer cavity adjustable laser side mode suppression ratio and stability of channel supervisory control system according to claim 8, it is characterized in that, specific implementation is: first, extenal cavity tunable laser device is selected a passage job according to system requirements, opens specific wavelength Laser output, the information gathering of the wavelength locker forming according to the first sampling standard tool (19), the first photodetector (24) and the 5th photodetector (20), computational analysis provides passage and whether exports normal information and implement closed-loop control, guarantees that laser works is at correct specific wavelength passage, when specific wavelength work is opened and be stabilized in to extenal cavity tunable laser device, controller (30) provides sampling channel grouping information according to specific wavelength channel information, the collection of adjacent channel luminous power will mask the second photodetector (23) pointedly, some output in the 3rd photodetector (22) and the 4th photodetector (21), and automatically the output of two other optical power detector is wherein denoted as to adjacent or right neighbour's luminous power inspection sampling in the vicinity, start computational analysis, first be by calculating in the vicinity adjacent or right neighbour's luminous power with respect to the ratio of total Output optical power, obtain the numerical value of side mode suppression ratio, in addition by calculating in the vicinity adjacent luminous power with respect to the ratio of right neighbour's luminous power, provide spectrum symmetry data, if this ratio exceeds certain predetermined threshold value, point out spectrum symmetry to exceed standard, while output symmetry directional information, actually or the high right neighbour's power of adjacent power is high in the vicinity, according to the spectrum symmetry Output rusults that exceeds standard, especially asymmetrical directional information, starts the tunable filter in laser cavity by controller, and fine setting tunable filter also continues by above-mentioned method monitoring spectrum symmetry, until satisfied, realize a kind of spectrum symmetry of closed loop and control.
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| JP7433958B2 (en) | 2020-02-13 | 2024-02-20 | 古河電気工業株式会社 | Laser device and its control method |
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