Wavelength tunable laser diode.

摘要

A wavelength tunable laser diode comprises a temperature variable heater (8) separated from an active layer (1) by a distance less than the thickness of a compound semiconductor substrate (3). Because the heater (8) is located very close to the active layer (1), the response time of temperature change is improved. That in turn widens the tunable range of the laser diode. <IMAGE>