Patent ID: 7187700
Filing Date: 2007-03-06
Classification: H01S,H04B

Abstract:
1. A wavelength division multiplexing (WDM) light source, comprising: a Fabry-Perot laser for receiving spectrum-spliced incoherent light to amplify and output only an oscillation mode matching with a wavelength of the injected light; a bias controlling unit for limiting a current supplied to the Fabry-Perot laser to a bias current, wherein the bias current has a value adjacent to a threshold current of the Fabry-Perot laser, and wherein the value of the threshold current changes according to temperature of the Fabry-Perot laser and according to relationship between the injected light, which changes depending on the temperature of the Fabry-Perot laser, and a wavelength of the oscillation mode, wherein said bias controlling unit further comprises: a threshold current sensor for sensing the threshold current of the Fabry-Perot laser, wherein the threshold current sensor includes an impedance sensor for sensing the threshold current of the Fabry-Perot laser based on a change of impedance of the Fabry-Perot laser; and a bias controller for adjusting the bias current supplied to the Fabry-Perot laser depending on the sensed threshold current.