V-type coupled cavity semiconductor laser unit based on on-chip heating resistor wavelength tuning

Abstract

The invention discloses a V-type coupled cavity semiconductor laser unit based on on-chip heating resistor wavelength tuning. The V-type coupled cavity semiconductor laser unit comprises a V-type coupled cavity semiconductor laser unit body composed of a half-wave coupler, a fixed gain cavity and a wavelength tuning cavity. The top of the wavelength tuning cavity is provided with a heating thin-film resistor, and an electric insulation thin layer is arranged between the heating thin-film resistor and an electricity injection metal electrode of the V-type coupled cavity semiconductor laser unit body; or one side face of the wavelength tuning cavity is provided with a heating thin-film resistor, and electrodes are led out from two ends of the heating thin-film resistor respectively. According to the V-type coupled cavity semiconductor laser unit, compared with current injection tuning, the on-chip heating resistor wavelength tuning can lower influence by current noise and improve the line width stability of a semiconductor laser unit. Moreover, the wavelength tuning range can be expanded through shift of a gain spectrum along with temperature.

Description

technical field [0001] The invention relates to a wavelength tunable semiconductor laser, in particular to a V-type coupling cavity semiconductor laser based on on-chip heating resistor wavelength tuning. Background technique [0002] Broadband wavelength tunable semiconductor lasers have great application value in the fields of optical communication and sensing. It has the advantages of saving device size, reducing cost, being easy to produce, and improving stability. With the development of communication technology and the increase of demand, people put forward higher requirements on the single longitudinal mode performance, wavelength tuning characteristics and stability of tunable semiconductor lasers. In the research so far, wavelength tuning mainly includes means such as temperature tuning and current tuning. [0003] It is an efficient and reliable temperature tuning scheme to use the on-chip heating resistor to tune the temperature of the laser. Shinji Sakano, Tom...

AI Technical Summary

Problems solved by technology

However, the laser is tuned by changing the electrical injection current, and the tuning range is limited by the gain spectrum at the operating temperature; and the change of the injected carrier concentration will bring noise, which will affect the linewidth characteristics of the laser output laser

In addition, when the electrical injection current reaches a certain intensity, the thermal effect of the current actually plays a leading role. At this time, not only the output laser wavelength of the laser is changed during tuning, but also the laser power, so it will cause power instability.

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