Patent ID: 6819876
Filing Date: 2004-11-16
Classification: H04B

Abstract:
A transmitting method that comprises:receiving an input electric pulse having a leading edge and a trailing edge, generating a drive signal in response to the input electric pulse and applying the drive signal to a light emitting device provided at a transmitting side, thereby emitting an optical pulse from said light emitting device, wherein the drive signal comprises a DC bias current and a sequence of two pulses having opposite polarity with respect to the DC bias current such that the optical pulse emitted by the emitting device has a waveform that is symmetrical with respect to a bias optical level corresponding to a level of light generated by said light emitting device in response to said DC bias current and such that the mean value of the optical pulse is equal to the bias optical level, transmitting the optical pulse over an optical transmission line to a receiving side, and receiving the optical pulse by a light receiving device at the receiving side and converting the received optical pulse into an output electric signal.