Method for tuning laser output wavelength based on self-mixing effect

A technology of tuning lasers and self-mixing, which is applied to devices, optics, and instruments that control the output parameters of lasers to achieve the effects of high repeatability, stable output optical power, and simple external modification.

Inactive Publication Date: 2009-10-28
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

At present, the tuning interval is 0.8nm, but the tuning speed generally requires a few seconds of tuning time

Method used

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  • Method for tuning laser output wavelength based on self-mixing effect
  • Method for tuning laser output wavelength based on self-mixing effect
  • Method for tuning laser output wavelength based on self-mixing effect

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Embodiment Construction

[0033] Such as figure 1 As shown, the device of the present invention is composed of a laser 1 , a beam splitter 2 , a variable attenuation plate 3 , a mirror 4 , a spectrometer 5 , a detector 6 , and an optical power meter 7 . The detector 6 generally adopts a photodiode or a photomultiplier tube detector.

[0034] The concrete implementation of the inventive method is as follows: as figure 1 As shown, laser 1 adopts a continuous semiconductor laser with an output wavelength of 1060nm. Because it is in the invisible band, a visible light can be introduced during the experiment as an auxiliary optical path, which is convenient for subsequent optical path adjustment; beam splitter 2 is a 45° beam splitter. When the feedback light intensity can meet the needs of the experiment, increase the transmission ratio of the beam splitter as much as possible to make the output light power as large as possible. Through the analysis of experimental data, the transmission ratio of the beam...

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Abstract

A method for tuning laser output wavelength based on self-mixing effect belongs to the field of opto-electrical engineering. The tuning method comprises the following steps of: feeding laser output light back to a laser by an external reflecting mirror; realizing the tuning of the laser output wavelength by changing feedback light intensity by making use of semiconductor laser self-mixing effect. Ways for controlling backward feedback light intensity are as follows: inserting a linear polarizer, an attenuation film and a variable diaphragm between the laser and the reflecting mirror, or adjusting the pitching of the reflecting mirror. The invention provides a new method for tuning laser output wavelength, which can effectively avoid larger power change due to wavelength tuning, thus realizing the purpose of keeping the output light power to be relatively stable during the wavelength tuning. In addition, the method can be applied to conducting external modification to the laser with fixed wavelength, thus causing the wavelength to be adjustable, being simple and easy, and greatly reducing the cost for system modification.

Description

technical field [0001] The invention relates to a method for tuning the output wavelength of a laser, in particular to a method for tuning the output wavelength of a semiconductor laser. technical background [0002] With the expansion of the transmission capacity of the optical communication network, the demand for the number of wavelengths is increasing, and the traditional light source used in the optical communication network is a fixed-wavelength laser, so it is necessary to match multiple fixed-wavelength lasers for each wavelength channel. It leads to rising costs, complicated management and an increase in the number of equipment. Tunable wavelength lasers not only solve many problems faced by system design, greatly improve the efficiency of optical networks, but also reduce production and management costs. Therefore, tuning the laser output wavelength is a very important topic. [0003] Semiconductor lasers generally use various Fabry-Perot resonators, and cavity l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35H01S5/06
Inventor 李斌成曲哲超刘显明韩艳玲
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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