Patent ID: 8594469
Filing Date: 2013-11-26
Classification: G02F,H01S

Abstract:
1. An optical amplifier comprising: a passive waveguide region configured to receive an incident optical signal and to adjust a mode of the optical signal; and an active waveguide region integrated with the passive waveguide region and receiving the adjusted optical signal from the passive waveguide region, the active waveguide region being configured to perform gain modulation on the received optical signal by changing a density of the carriers therein in response to a first current applied to the active waveguide region, wherein an intensity of the optical signal is adjusted by changing the density of the carriers, wherein an internal loss of the active waveguide region is adjusted to produce a resonance-like form so that in response to an increasing frequency of the optical signal, an electro-optic response of the optical amplifier has a net increase at first, and then begins to have a net decrease at a predetermined value to thereby increase a bandwidth of the active waveguide, wherein the internal loss of the active waveguide region is increased by increasing an absorption coefficient thereof by controlling a doping of the active waveguide region.