Patent ID: 6819703
Filing Date: 2004-11-16
Classification: H01S

Abstract:
An external cavity laser for oscillating laser light through a connector, comprising:a fiber Bragg grating section formed of an optical fiber having a Bragg wavelength of light reflected by a grating adjusted to a given wavelength; a laser light emitting device that generates light, and that is optically coupled to the fiber Bragg grating section to ensure input and output of the light, said laser light emitting device including a reflective surface for reflecting the generated light; a cavity that is formed by the laser light emitting device and the grating, and that resonates the light between the reflective surface of the laser light emitting device and the grating, thereby oscillating a laser beam having a given oscillation wavelength; a connector that outputs the light oscillated by the cavity, said connector being a first connector provided on an optical path extending from the laser light emitting device, and intercepting means for intercepting waves reflected from the connector so that the external cavity laser maintains a relative intensity noise (RIN) less than âˆ’130 dB/Hz in a transmission band having frequencies equal to or less than 10 GHz; wherein the fiber Bragg grating section is located on the optical path between the laser light emitting device and the connector; and wherein the intercepting means is located on the optical path between the fiber Bragg grating section and the connector.