Patent ID: 6480314
Filing Date: 2002-11-12
Classification: H01S,H04B

Abstract:
An optical transmitter comprising:an optical transmitting unit that outputs a signal light; an optical receiving unit that receives part of the signal light output from the optical transmitting unit; a transmission level detector that detects a transmission level of the signal light received by the optical receiving unit; a reference level generator that generates a reference level on the basis of a mark rate of transmission data; a driving current changing unit that changes a driving current for the optical transmitting unit so that the transmission level detected by the transmission level detector is substantially equal to the reference level generated by the reference level generator; a driving current feed unit that drives the optical transmitting unit by feeding the driving current changed by the driving current changing unit into the optical transmitting unit; and a time constant compensating unit that stops the feed of the driving current into the optical transmitting unit by the driving current feed unit upon receipt of an optical output cut-off signal, and compensates for individual different time constants at the time of a change of the transmission level and the reference level in a transient response time after receipt of the optical output cut-off signal by changing the transmission level and the reference level.