Patent ID: 9686018
Date: 2017-06-20
CPC Classifications: G02B,H01S,H04B

Claim:
1. An optical transmitter, comprising: a wavelength tunable laser diode (t-LD) that emits light at a target wavelength, the t-LD providing a sampled grating distributed feedback (SG-DFB) section and a chirped sampled grating distributed Bragg reflector (CSG-DBR) section that forms an optical cavity combined with the SG-DFB section, the optical cavity setting an emission wavelength of the t-LD at the target wavelength; an etalon filter that receives the light emitted from the t-LD and outputs filtered light having an amplitude depending on a wavelength of the light output from the t-LD; an optical detector that receives filtered light output from the etalon filter; a phase converter that receives the output of the optical detector and outputs two signals complementary to each other; and a selector that superposes one of the two complementary signals output from the phase converter on a bias current supplied to the SG-DFB section.