Patent ID: 7428254

Claim:
A tuneable laser apparatus comprising: a tuneable laser; a thermal sensor to sense a laser temperature of said tuneable laser; and a controller that controls at least one of a tuning section, a phase section, a tuning section current, a tuning section voltage, a phase section current and a phase section voltage, and incorporates an adjusting device which adjusts at least one of the tuning section, the phase section, the tuning section current, the tuning section voltage, the phase section current and the phase section voltage based on a required operating value of an output wavelength of the tuneable laser the depends on temperature and at least one of the tuning section current, the tuning section voltage, the phase section current and the phase section voltage, whereby the output wavelength is kept at the operating value without a substantial mode jump independent of the sensed temperature of operation within an operative range of the tuneable laser.