Patent ID: 8238759

Claim:
An apparatus, comprising; a substrate; a plurality of transmitters provided on the substrate, the plurality of transmitters supplying a plurality of first multiplexed optical signals, each of the plurality of first multiplexed optical signals having a corresponding one of a plurality of wavelengths, each of the plurality of transmitters comprising: a laser configured to output a continuous wave (CW) optical signal, the CW optical signal having a corresponding one of a plurality of wavelengths; a plurality of modulators, each of which receiving a corresponding one of a plurality of portions of the CW optical signal, each of the plurality of modulators supplying a corresponding one of a plurality of modulated optical signals; a plurality of phase shifters configured to receive selected ones of the plurality of modulated signals and output a plurality of phase shifted modulated optical signals; and a first optical combiner configured to combine remaining ones of the plurality of modulated optical signals and the plurality of phase shifted modulated optical signals, the first optical combiner outputting one of the plurality of first multiplexed optical signals; and a second optical combiner, the second optical combiner configured to receive the plurality of first multiplexed optical signals and configured to output a second multiplexed optical signal.