Patent ID: 7212747
Filing Date: 2007-05-01
Classification: H04B

Abstract:
1. An optical transmission device for transmitting an optical signal, the optical transmission device comprising: a variable light emitting section for obtaining a supply of a radio band transmission signal generated in a burst manner and a control signal indicating whether there is data to be transmitted, and outputting an optical signal modulated by the transmission signal; a light receiving section for receiving the optical signal output from the variable light emitting section and converting the received optical signal into an electric signal; a light intensity detection section for detecting an intensity of the optical signal received by the light receiving section; and a high frequency amplification section for amplifying the electric signal output from the light receiving section in accordance with the light intensity detected by the light intensity detection section, wherein the variable light emitting section includes: wherein the high frequency amplification section is operable to amplify the electric signal output from the light receiving section by a first amplification factor if the light intensity detected by the light intensity detection section exceeds the predetermined threshold value, and operable to amplify the electric signal by a second amplification factor smaller than the first amplification factor if the light intensity is equal to or smaller than the predetermined threshold value, and wherein the second amplification factor is substantially equal to zero.