CN104733995A - Wave length locking device - Google Patents

The invention provides a wave length locking device. The wave length locking device comprises a first optical splitter, a second optical splitter, a first etalon, a second etalon, a first detector, a second detector, a third detector, a thermoelectric cooler and a thermistor. The first etalon, the second etalon and the thermistor are fixedly pasted on the thermoelectric cooler, the wave length locking device is novel and simple in structure and flexible in application, and meanwhile the wave length locking function is achieved.

A kind of wavelength locker

Technical field

The present invention relates to optical communication field, particularly relate to a kind of wavelength locker.

Background technology

At present, dwdm system optical channel interval by 100GHz to 50GHz even 25GHz system stride forward, system proposes more and more stricter requirement to used laser, is necessary to adopt effective wavelength stabilizing technique, to improve laser wavelength stability.This demand of wavelength locker positive adaptation is the Primary Component of dense wavelength division multiplexing system.

A typical wavelength locker light channel structure is as shown in square frame in Fig. 1, the flashlight that laser sends is after input optical collimator standard, transport to the first optical splitter, obtained flashlight is divided into two bundles by this first optical splitter, wherein, a branch of by the first detector reception also detector luminous power, another bundle is after the filtering of air-gap F-P etalon, to the second optical splitter, the flashlight received is divided into two bundles by described second optical splitter, wherein, a branch ofly received by the second detector and detect its luminous power, another bundle is after exporting optical collimator collimation, export along input-output light path, the flashlight of this output has been through after filtering, can be used for other need of work of system, described first detector and the second detector export result of detection to described controller, the result of detection of the first detector and the second detector compares by described controller, obtain an error signal, again according to this error signal, the temperature of described laser is controlled by controlling described thermoelectric refrigerating unit TEC, finally to realize the locking to laser wavelength.

The wavelength locker provided in prior art is based on air chamber F-P etalon principle, and have the advantage that temperature stability is good, but air-gap F-P etalon realizes complex process, wavelength locking point is fixed, and does not possess regulating power, application underaction.

Summary of the invention

The invention provides a kind of wavelength locker, described wavelength locker novel structure, simple, applying flexible, realizes the function of wavelength locking simultaneously.

The concrete technical scheme of wavelength locker provided by the present invention is: a kind of wavelength locker, comprises the first optical splitter, the second optical splitter, the first etalon, the second etalon, the first detector, the second detector, the 3rd detector; Wherein, described first optical splitter, the first etalon are connected successively with the first detector, and described second optical splitter, the second etalon are connected successively with the second detector, and described first optical splitter, the second optical splitter are connected successively with the 3rd detector; It is characterized in that: also comprise a thermoelectric cooling module and a thermistor, described first etalon, the second etalon and thermistor are fixedly bonded on thermoelectric cooling module respectively.

Wherein, preferred embodiments is: the first etalon, the second etalon and thermistor are fixed on thermoelectric cooling module by heat-conducting glue.

Wherein, preferred embodiments is: thermistor is identical with the temperature of thermoelectric cooling module.

Wherein, preferred embodiments is: the first optical splitter is gular transparent solid block, and its light-entering surface is coated with spectro-film, and its light output surface is coated with anti-reflection film.

Wherein, preferred embodiments is: the second optical splitter is gular transparent solid block, and its light-entering surface is coated with spectro-film, and its refractive power surface is set to burnishing surface, and its light output surface is coated with anti-reflection film.

Wherein, preferred embodiments is: the first etalon has different free spectral ranges from the second etalon, and both be arranged in parallel.

Wherein, preferred embodiments is: after flashlight inputs the first optical splitter, is decomposed into transmitted light and reverberation, and wherein transmitted light is after the first etalon filtering, is received by the first detector; After reverberation inputs the second optical splitter, be decomposed into the second reverberation and the second transmitted light, wherein the second reverberation is via after the second etalon filtering, is received by the second detector; Second transmitted light, after the second optical splitter total reflection, is received by the 3rd detector.

Wavelength locker of the present invention, compared to prior art, there is following beneficial effect: first, first etalon and the second etalon are on thermoelectric cooling module, first etalon is consistent with the temperature of the second etalon and the temperature of thermoelectric cooling module, by changing the temperature of thermoelectric cooling module, changes the temperature of the first etalon and the second etalon, thus the light path changed by the first etalon and the second etalon, realize the adjustment of wavelength locking point; Secondly, be provided with the first etalon and the second etalon two etalons, two standards have different free spectral ranges (FSR), make this wavelength locker be applicable to the wdm system at two kinds of different channels intervals, add application flexibility; Finally, one of them surface of the second optical splitter is set to the burnishing surface of total reflection, exports, decrease the size of whole wavelength locker, reduce cost after making beam direction half-twist.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, structure of the present invention is further illustrated.

Fig. 1 is the structured flowchart of the wavelength locker of prior art.

Fig. 2 is the structural representation of wavelength locker of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments, wavelength locker of the present invention is described further.

As shown in Figure 2, wavelength locker of the present invention, it comprises the first optical splitter 11, second optical splitter 12, first etalon 21, second etalon 22, thermoelectric cooling module (TEC) 31, thermistor 41, first detector (PD) 51, second detector (PD) 52 and the 3rd detector (PD) 53.Described first optical splitter 11, first etalon 21 is connected successively with the first detector 51, described second optical splitter 12, second etalon 22 is connected successively with the second detector 52, and described first optical splitter 11, second optical splitter 12 is connected successively with the 3rd detector 53.

Wherein the first optical splitter 11 is gular transparent solid block, and its light-entering surface is coated with spectro-film, and its light output surface is coated with anti-reflection film; Second optical splitter 12 is gular transparent solid block, and its light-entering surface relative with the first optical splitter 11 is coated with spectro-film, and its light output surface relative with the 3rd detector 53 is coated with anti-reflection film, and the refractive power surface of its light process is burnishing surface; Described second optical splitter is coated with light splitting face and the first optical splitter 11 apparent surface be arranged in parallel; The burnishing surface of described second optical splitter 12, will have the light beam total reflection of the surface transmission being coated with spectro-film, export, received after the direction half-twist of light beam the most at last by the 3rd detector 53 via the surface being coated with anti-reflection film.

Described first etalon 21, second etalon 22 has different free spectral ranges, and be arranged in parallel; Described first etalon 21, second etalon 22 and described thermistor 41 are fixedly bonded on thermoelectric cooling module 31 respectively, all can adopt the mode that heat-conducting glue is fixing.Wherein, the first etalon 21 and the temperature of the second etalon 22 and the temperature of TEC31 are consistent, and the temperature of thermistor 41 and the temperature of TEC31 are consistent; Be added in sense of current and size on TEC by changing, the characteristic simultaneously utilizing thermistor 41 resistance to change with temperature change, to feed back the temperature of TEC, can realize the adjustment of etalon temperature.

The operation principle of described wavelength locker is as follows:

Flashlight inputs to the first optical splitter 11, and obtained flashlight is divided into two bundles by described first optical splitter 11, and it comprises through Beam, a branch of reverberation, and wherein transmitted light is after the first etalon 21 filtering, is received by the first detector 51; Reverberation transports to the surface being coated with spectro-film of the second optical splitter 12, is divided into two-beam by the second optical splitter 12, is the second reverberation and the second transmitted light, and wherein the second reverberation is via after the second etalon 22 filtering, is received by the second detector 52; Wherein the second transmitted light is after the total reflection of the second optical splitter 12, is received by the 3rd detector 53.

Wavelength locker of the present invention, compared to prior art, there is following beneficial effect: first, first etalon 21 and the second etalon 22 are on TEC31, first etalon 21 is consistent with the temperature of TEC31 with the temperature of the second etalon 22, by changing the temperature of TEC31, changes the temperature of the first etalon 21 and the second etalon 22, thus the light path changed by the first etalon 21 and the second etalon 22, realize the adjustment of wavelength locking point; Secondly, be provided with the first etalon 21 and the second etalon 22 two etalons, two etalons have different free spectral ranges (FSR), make this wavelength locker be applicable to the wdm system at two kinds of different channels intervals, add application flexibility; Finally, one of them surface of the second optical splitter 12 is set to the burnishing surface of total reflection, exports, decrease the size of whole wavelength locker, reduce cost after making beam direction half-twist.

As described above, be only preferred embodiment, and not for limiting the scope of the invention, all equivalences done according to the present patent application the scope of the claims change or modify, and are all the present invention and contain.