Tunable laser and laser transmitter

Abstract

A tunable laser comprises a reflective semiconductor optical amplifier (SOA), a grating co-directional coupler and a reflective micro-ring resonator, and the grating co-directional coupler and the reflective micro-ring resonator are both formed on a silicon substrate. A first end face of the reflective SOA is provided with an anti-reflection film, and the first end face is an end face where the reflective SOA is coupled with a first waveguide of the grating co-directional coupler. A second waveguide of the grating co-directional coupler is coupled with the first waveguide, the first waveguideis provided with 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 narrow-band filter, and thesecond waveguide is connected with the reflective micro-ring resonator. The tunable laser has the advantages that wavelength tuning is easier, and the wavelength tuning speed is higher.

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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