Patent ID: 6535315
Filing Date: 2003-03-18
Classification: H04B

Abstract:
An optical fiber transmitter comprising:a light source to produce a light in use; a first frequency modulator coupled to the light source, wherein the first frequency modulator generates a first tone microwave with a first frequency f1 to drive the light source; an external phase modulator coupled to the light source to receive the light exported from the light source; a second frequency modulator coupled to the external phase modulator, wherein the second frequency modulator generates a second tone microwave with a second frequency f2 to drive the external phase modulator, and the second frequency f2 is higher than the first frequency f1; at least one fiber amplifier coupled to the external phase modulator to amplify the light exported from the external phase modulator; at least one optical receiver to receive the light exported from the fiber amplifier; and a microprocessor coupled to the first frequency modulator and the second frequency modulator to perform modulation on the light, so as to automatically obtain a desired modulation index for a desired transmission distance.