Wavelength-tunable external cavity laser device

Abstract

The invention discloses a wavelength-tunable external cavity laser device. The device comprises a laser gain chip, a collimating lens, an optical path compensation sheet, a first adjustable filter, asecond adjustable filter, a partial reflector, an optical isolator, a converging lens and a receiving optical fiber which are sequentially arranged along an optical path; the partial reflecting surface of the partial reflector and the high reflecting surface at the back of the laser gain chip form a laser resonant cavity, and the external cavity laser device achieves tuning output of single-wavelength lasers by controlling the first adjustable filter and the second adjustable filter. The laser device can not only reduce the bandwidth of output wavelength but also enlarge the wavelength tuningrange and simultaneously lower the manufacturing difficulty of a standard distance. In addition, the coupling optical path of the whole external cavity laser device with the structure is relatively compact, and the miniaturization of the size of the whole laser device can be achieved.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a wavelength tunable external cavity laser. Background technique [0002] With the increasing development of the communication field, the fixed-wavelength lasers used in the DWDM (Dense Wavelength Division Multiplexing) system have high costs for maintenance and storage due to the large number of specifications and low flexibility of use. Therefore, the development and application of tunable lasers solve the above problems. Broadband tunable lasers can achieve tunable output at any wavelength in C-Band or L-Band, making the system not only more intelligent and flexible, but also lower cost. [0003] The external cavity tunable laser has the advantages of wide wavelength tuning range, high output power, and narrow line width. Its basic structure is that the laser gain chip and the mirror form the resonant cavity of the laser, and filter elements are added in the middle for mod...

AI Technical Summary

Problems solved by technology

Some of the existing technologies adopt the structure of inserting a grating and MEMS combination in the external cavity laser resonator, and use the grating dispersion and rotating MEMS mirror for filtering. The tuning wavelength of this structure is sensitive to the reflection angle of MEMS, and the structure is relatively complicated.

Another solution uses a single standard distance in the resonator of the external cavity laser for filtering mode selection. This structure not only requires high precision of the standard distance, but also limits the tuning range.

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