CN104348076A - Tunable filtering structure and laser device - Google Patents
Tunable filtering structure and laser device Download PDFInfo
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- CN104348076A CN104348076A CN201310334881.6A CN201310334881A CN104348076A CN 104348076 A CN104348076 A CN 104348076A CN 201310334881 A CN201310334881 A CN 201310334881A CN 104348076 A CN104348076 A CN 104348076A
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- filter
- itu
- adjustable angle
- tunable laser
- etalon
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Abstract
The invention discloses a tunable laser structure which is characterized by including an ITU etalon, an angle-adjustable optical filter and an angle-adjustable compensation plate, which are arranged sequentially along an optical path. The angle-adjustable compensation plate and the angle-adjustable optical filter can perform opposite synchronous rotation. The invention also discloses a laser device which adopts the structure. The tunable filtering structure and the laser device adopt the angle-adjustable optical filter and the ITU etalon, which are combined for filtering so that an ITU-wavelength-adjustable or wavelength-adjustable laser device is realized; and the laser device has the following beneficial effects: it is prevented that a traditional ITU-wavelength laser device needs to stabilize and adjust the work wavelength and work current of each laser device so that through a simple and convenient method, ITU-waveband-adjustable laser wavelength output is realized.
Description
Technical field
The present invention relates to laser field, particularly relate to a kind of tunable optic filter and laser.
Background technology
In optical communications industry, International Telecommunications Union (ITU Inter-national Telecommunication Union) strictly defines each channel wavelength used and bandwidth.For coarse wavelength division multiplexing systems (CWDM).Be spaced apart 20nm between channel, and for dense wavelength division multiplexing system (DWDM), the interval between channel is only 2nm, 0.8nm (100GHz), even 0.4nm (50GHz).Require that the stability of communication light source used will be got well, and the isolation of wavelength division multiplexing and stability requirement are all very high.In the practical application of optical communication, the monitoring of wavelength-division multiplex system, the test etc. of wavelength division multiplex device all need to be applied to the LASER Light Source be positioned on ITU wavelength.The method of traditional generation multiwavelength laser is the multiple distributed feedback laser diode of combination (DFB LD), or use single-chip integration multiple-wavelength laser, but this making to laser requires very high, need operation wavelength and the operating current of stablizing and regulate each laser, otherwise be difficult to many wavelength tunings on ITU wavelength.In view of the application prospect widely of the laser of ITU wavelength, people have dropped into great enthusiasm in the development of this kind of laser, and this kind of laser that is simple, low cost just seems abnormal important.
Summary of the invention
For the problems referred to above, the combination of a kind of filter humorous by adjustable angle and ITU etalon is the object of the present invention is to provide to achieve tunable filtering structure and the laser of the output of ITU wavelength.
For achieving the above object, technical scheme proposed by the invention is: a kind of tunable laser structure, it is characterized in that: comprise set gradually along light path the etalon (be called for short: ITU etalon) with ITU interval, the filter of adjustable angle, the compensating plate of adjustable angle, the compensating plate of described adjustable angle and the filter of adjustable angle can do reverse sync and rotate.
Further, described ITU etalon is the adjustable etalon of the temperature made with Si.
Further, described ITU etalon also can be the etalon being equal to ITU wavelength interval with FSR interval.
Further, the filter of described adjustable angle is the plural layers filter of all dielectric.
Further, the filter of described adjustable angle is the grating filter that transmission peak wavelength changes with incidence angle.
Further, the filter of described adjustable angle comprises a filter and a stepping motor or gear, and described filter is placed on stepping motor or gear; The compensating plate of described adjustable angle comprises a compensating plate and a stepping motor or gear, and described compensating plate is placed on stepping motor or gear; Described reverse sync rotates through gear or stepping motor controls.
Further, in order to eliminate the impact of polarized light, between described ITU etalon and the filter of adjustable angle, be provided with one the one walk-off crystal, and in two light paths of outgoing from a walk-off crystal, wherein have a light path to be provided with one first half-wave plate; Be provided with one second half-wave plate and the 2nd walk-off crystal after the compensating plate of described adjustable angle, the second described half-wave plate is located in another light path corresponding to the first half-wave plate.
The present invention also comprises a kind of external-cavity tunable laser, comprise the LD microplate, collimating lens, the Effect of Back-Cavity Mirror that set gradually along light path, it is characterized in that: between described collimating lens and Effect of Back-Cavity Mirror, be provided with the above-mentioned tunable laser structure not being provided with walk-off crystal, half-wave plate.
The present invention also comprises a kind of straight cavate tunable optical fiber laser, comprises the pump light source, input collimating lens, gain fibre, first collimator, the second collimater, the output collimating lens that set gradually along light path; It is characterized in that: between described first collimator and the second collimater, be provided with the above-mentioned tunable laser structure being provided with walk-off crystal, half-wave plate.
The present invention also comprises a kind of travelling-wave cavity tunable optical fiber laser, comprise the pump light source, the first coupler, gain fibre, first collimator, the second collimater, the second coupler, described second coupler that set gradually along light path to export a light part and enter the first coupler and form annular chamber, another part light is as Laser output; It is characterized in that: between described first collimator and the second collimater, be provided with the above-mentioned tunable laser structure being provided with walk-off crystal, half-wave plate.
Adopt technique scheme, tunable filtering structure of the present invention and laser, adopt the humorous filter of adjustable angle and ITU etalon combined filter; Realize ITU Wavelength tunable or Wavelength tunable laser; The beneficial effect had is: the needs avoiding traditional ITU long wavelength laser are stablized and regulate operation wavelength and the operating current of each laser, just achieves the adjustable optical maser wavelength of ITU wave band export by mode simply and easily.
Accompanying drawing explanation
Fig. 1 is the variation relation figure of centre wavelength with incidence angle of filter;
Fig. 2 is ' p ' light spectrum width different with ' s ' light and decay schematic diagram;
Fig. 3 is tunable laser structural representation of the present invention;
Fig. 4 is the angular adjustment schematic diagram adopting stepping motor;
Fig. 5 is the tunable laser structural representation increasing walk-off crystal and half-wave plate;
Fig. 6 is external-cavity tunable laser structural representation of the present invention;
Fig. 7 is the tunable optical fiber laser schematic diagram of straight cavate;
Fig. 8 is the tunable optical fiber laser schematic diagram of annular chamber.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Design principle of the present invention is: we know that the transmission peak wavelength of the F-P cavity of all dielectric changes with the change of incidence angle, and meet relation:
wherein λ
0for the centre wavelength of normal incidence, θ is the angle with normal incidence,
Corresponding high index of refraction and low-index layer respectively, so want to realize large tunable scope, we need to select large m and little refractive index.Fig. 1 is the n of simulation
l=1.458; n
h=2.05; The 3-cavitySiO of m=2
2/ Ta
2o
5the result of film filter.In fact, in the application of reality, we also need to consider that the polarity effect of light is on the impact of filter, and as shown in Figure 2, these solve by increasing the modes such as wave plate compensates in the optical path.
Therefore, we devise a kind of tunable laser structure, as shown in Figure 3, comprise the ITU etalon 102, the filter 103 of adjustable angle, the compensating plate 104 of adjustable angle that set gradually along light path, the compensating plate 104 of described adjustable angle can be cooked reverse sync with the filter 103 of adjustable angle and rotate.Preferably, described ITU etalon 102 is the adjustable etalon of the temperature made with Si, or is equal to the etalon of ITU wavelength interval with FSR interval.Preferably, the filter 103 of described adjustable angle is the plural layers filter of all dielectric or the grating filter that changes with incidence angle for transmission peak wavelength.
As shown in Figure 4, angular adjustment mode can adopt: the filter plate 103 of adjustable angle and the compensating plate 104 of adjustable angle are respectively filter plate and are located on two stepping motors 110 and 118 that velocity of rotation is identical, direction is contrary with compensating plate, so just can realize the compensation of the tuning of angle and light path; Also can adopt and make stepping motor into gear.
As shown in Figure 5, in order to eliminate the impact of plan light, between ITU etalon 203 and the filter 206 of adjustable angle, be provided with one the one walk-off crystal 204, and in two light paths of outgoing from a walk-off crystal 204, wherein have a light path to be provided with one first half-wave plate 205; Be provided with one second half-wave plate 208 and the 2nd walk-off crystal 209 after the compensating plate 207 of described adjustable angle, the second described half-wave plate 208 is located in another light path of the first half-wave plate 205 correspondence.
During concrete use, when tunable laser structure of the present invention is used for external-cavity tunable laser, as shown in Figure 6, external-cavity tunable laser, comprise 100 for LD microplate, 101 is collimating lens, 102 is ITU etalon, 103 is the filter of adjustable angle, and 104 is compensating plate, and 105 is the Effect of Back-Cavity Mirror of laser; The light of LD microplate 100 is through the compensating plate 104 of the humorous filter plate 103 of collimating lens 101, ITU etalon 102, adjustable angle and adjustable angle, and the resonance of laser realizes between Effect of Back-Cavity Mirror 105 and the right side of LD microplate 100.Because the general polarization of LD microplate 100 is here single, do not need to increase the optical compensation devices such as walk-off.
As shown in Figure 7, tunable laser structure of the present invention can also be applied to straight cavate tunable optical fiber laser, the pump light that pump light source 210 sends is incident through gain fibre 201 from the left side of collimater 200, ITU etalon 203 is incided afterwards after first collimator 202 collimates, in order to eliminate the impact of different polarization light, light is decomposed into o light and e light by increase the one walk-off crystal 303 by us, compensated by the first half-wave plate 204 afterwards, and then by the filter plate 206 of adjustable angle and the compensating plate 207 of adjustable angle, finally by the second half-wave plate 208 and the 2nd walk-off crystal 209, resonance is realized in chamber, afterwards by the second collimater 211, export the output that collimating lens 212 just can realize laser.
Tunable laser structure of the present invention can also be applied to travelling-wave cavity tunable optical fiber laser, as shown in Figure 8, the pump light 314 that pump light source 314 sends is incided in gain fibre 300 then by first collimator 301 by the first coupler 313, ITU etalon 302, one walk-off crystal 303, first half-wave plate 304, adjustable angle filter 305, adjustable angle compensating plate 306, second half-wave plate 307, 2nd walk-off crystal 308, second collimater 309, finally passing through optical fiber 310, through the second coupler 311, part light is through optical fiber 315 looping chamber, a part is as Laser output 312.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; in the form and details the present invention is made a variety of changes, be protection scope of the present invention.
Claims (10)
1. a tunable laser structure, is characterized in that: comprise the ITU etalon, the filter of adjustable angle, the compensating plate of adjustable angle that set gradually along light path, the compensating plate of described adjustable angle and the filter of adjustable angle can do reverse sync and rotate.
2. a kind of tunable laser structure according to claim 1, is characterized in that: described ITU etalon is the adjustable etalon of the temperature made with Si.
3. a kind of tunable laser structure according to claim 1, is characterized in that: described ITU etalon is the etalon being equal to ITU wavelength interval with FSR interval.
4. a kind of tunable laser structure according to claim 1, is characterized in that: the filter of described adjustable angle is the plural layers filter of all dielectric.
5. a kind of tunable laser structure according to claim 1, is characterized in that: the filter of described adjustable angle is the grating filter that transmission peak wavelength changes with incidence angle.
6. a kind of tunable laser structure according to claim 1, is characterized in that: the filter of described adjustable angle comprises a filter and a stepping motor or gear, and described filter is placed on stepping motor or gear; The compensating plate of described adjustable angle comprises a compensating plate and a stepping motor or gear, and described compensating plate is placed on stepping motor or gear; Described reverse sync rotates through gear or stepping motor controls.
7. a kind of tunable laser structure according to the arbitrary claim of claim 1-6, it is characterized in that: between described ITU etalon and the filter of adjustable angle, be provided with one the one walk-off crystal, and in two light paths of outgoing from a walk-off crystal, wherein have a light path to be provided with one first half-wave plate; Be provided with one second half-wave plate and the 2nd walk-off crystal after the compensating plate of described adjustable angle, the second described half-wave plate is located in another light path corresponding to the first half-wave plate.
8. an external-cavity tunable laser, comprises the LD microplate, collimating lens, the Effect of Back-Cavity Mirror that set gradually along light path, it is characterized in that: be provided with the tunable laser structure described in the arbitrary claim of the claims 1-6 between described collimating lens and Effect of Back-Cavity Mirror.
9. a straight cavate tunable optical fiber laser, comprises the pump light source, input collimating lens, gain fibre, first collimator, the second collimater, the output collimating lens that set gradually along light path; It is characterized in that: between described first collimator and the second collimater, be provided with tunable laser structure according to claim 7.
10. a travelling-wave cavity tunable optical fiber laser, comprise the pump light source, the first coupler, gain fibre, first collimator, the second collimater, the second coupler, described second coupler that set gradually along light path to export a light part and enter the first coupler and form annular chamber, another part light is as Laser output; It is characterized in that between described first collimator and the second collimater, being provided with tunable laser structure according to claim 7.
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| CN201310334881.6A CN104348076A (en) | 2013-08-02 | 2013-08-02 | Tunable filtering structure and laser device |
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| CN201310334881.6A CN104348076A (en) | 2013-08-02 | 2013-08-02 | Tunable filtering structure and laser device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11480857B2 (en) | 2020-09-29 | 2022-10-25 | Coretronic Corporation | Adjustable optical module and projector |
| CN116224570A (en) * | 2023-04-28 | 2023-06-06 | 中国科学院长春光学精密机械与物理研究所 | Tunable filter and semiconductor laser |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020172239A1 (en) * | 1999-07-27 | 2002-11-21 | Mcdonald Mark E. | Tunable external cavity laser |
| CN1511363A (en) * | 2001-03-21 | 2004-07-07 | 英特尔公司 | Gradient film wedge interfere filter and method for toning laser thereof |
| US20050213618A1 (en) * | 2004-03-29 | 2005-09-29 | Sochava Sergei L | Semi-integrated designs for external cavity tunable lasers |
| CN101520557A (en) * | 2009-03-11 | 2009-09-02 | 福州高意光学有限公司 | Polarization controller |
-
2013
- 2013-08-02 CN CN201310334881.6A patent/CN104348076A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020172239A1 (en) * | 1999-07-27 | 2002-11-21 | Mcdonald Mark E. | Tunable external cavity laser |
| CN1511363A (en) * | 2001-03-21 | 2004-07-07 | 英特尔公司 | Gradient film wedge interfere filter and method for toning laser thereof |
| US20050213618A1 (en) * | 2004-03-29 | 2005-09-29 | Sochava Sergei L | Semi-integrated designs for external cavity tunable lasers |
| CN101520557A (en) * | 2009-03-11 | 2009-09-02 | 福州高意光学有限公司 | Polarization controller |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11480857B2 (en) | 2020-09-29 | 2022-10-25 | Coretronic Corporation | Adjustable optical module and projector |
| CN116224570A (en) * | 2023-04-28 | 2023-06-06 | 中国科学院长春光学精密机械与物理研究所 | Tunable filter and semiconductor laser |
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