A Tunable Laser and Laser Transmitter

Abstract

A tunable laser, comprising: a reflective semiconductor optical amplifier SOA, a grating co-coupler and a reflective micro-ring resonator, the grating co-coupler and the reflective micro-ring resonator are all formed on a silicon base; the reflective SOA An anti-reflection film is provided on the first end face, and the first end face refers to the end face of the reflective SOA coupled with the first waveguide of the grating co-coupler; the second waveguide of the grating co-coupler is coupled with the first waveguide, and the first waveguide There is a first grating, the second waveguide is provided with a second grating opposite to the first grating, and the first grating and the second grating form a narrowband filter; the second waveguide is connected with a reflective microring resonator. The tunable laser of the present application has the advantages of easier wavelength tuning and faster wavelength tuning.

Description

technical field [0001] The present application relates to the field of optical technology, in particular to a tunable laser and a laser transmitter. Background technique [0002] Tunable lasers are lasers that can continuously change the laser output wavelength within a certain range. In order to realize a wavelength tuning range of broadband (such as covering the C-band), a vernier tuning mechanism is usually used to realize wavelength tuning. There are two wavelength-tunable filter structures in the laser, both of which have comb-shaped filter lines, and the free spectral ranges (Free Spectrum Range, FSR) of the two filter lines are different. When a pair of central wavelengths in the filtering curves of the two filters are aligned, the peaks of other pairs of filters are staggered, so that the filtered spectral line at the aligned point has a maximum value, thereby outputting laser light. When the filter spectral line of a filter is adjusted by changing the refractive i...

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Problems solved by technology

[0004] However, the wavelength is required to be calibrated in the vernier tuning mechanism, and the wavelength calibration is difficult

In addition, during the vernier tuning process, the wavelength of the two microring resonators needs to be controlled, and the silicon waveguide is thermally sensitive, and the filter spectrum drifts significantly due to temperature, so it is difficult to accurately control the wavelength

It can be seen that the existing tunable lasers have high manufacturing process requirements and difficult tuning control

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