Patent ID: 7555222
Filing Date: 2009-06-30
Classification: H04B

Abstract:
1. A transmitter arrangement, the transmitter arrangement being arranged to provide a signal to a modulator, the modulator being arranged to create an optical data stream from the signal, the transmitter arrangement comprising: an encoder, the encoder having a variable state, the variable state of the encoder being arranged to be varied between a first encoder state and a second encoder state, wherein if the variable state of the encoder is the first encoder state, the encoder encodes the signal in a format associated with an optical duobinary (ODB) modulation format, and wherein if the variable state of the encoder is the second state, the encoder does not encode the signal in the format associated with the ODB modulation format; and a switching/filtering arrangement, the switching/filtering arrangement being arranged to be varied between a low bandpass configuration and a high bandpass configuration, the switching/filtering arrangement further being arranged to receive the signal from the encoder and to provide the signal to the modulator, wherein if the variable state of the encoder is the first encoder state, the switching/filtering arrangement is arranged in the low bandpass configuration, and wherein if the variable state of the encoder is the second encoder state, the switching/filtering arrangement is arranged in the high bandpass configuration.