US 2007/0183791 A1 · MULTIFORMAT TRANSMITTER

Abstract

Methods and apparatus for supporting a plurality of modulation formats using a single transmitter are disclosed. According to one aspect of the present invention, a transmitter arrangement that provides a signal to a modulator that creates an optical data stream from the signal includes an encoder and a switching/filtering arrangement. The encoder has a state that is varied between first and second encoder states. If the state is the first encoder state, the encoder encodes the signal in a format associated with an optical duobinary (ODB) modulation format. Otherwise, the encoder does not encode the signal in the format associated with the ODB modulation format. The switching/filtering arrangement receives the signal from the encoder, and provides the signal to the modulator. If the variable state of the encoder is the first encoder state, the switching/filtering arrangement has a low bandpass configuration. Otherwise, the switching/filtering arrangement has a high bandpass configuration.

Claims20

Dependent claims

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.

Dependencies are inferred from the claim text.

Multiformat transmitter

Life of this patent

Multiformat transmitter

Life of this patent

Abstract

Claims20