Photonic encoder
AssigneeOclaro Technology Limited
InventorRobert Griffin
Life of this patent
Estimating the term…
Abstract
A modulator arrangement for modulating an optical signal using a differential quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system comprising a laser for producing an optical signal of a selected wavelength, which signal is split by a splitter (4), each part of said split signal being applied to a respective phase modulator (6, 8). The phase modulators (6, 8) are adapted to modulate the phase of the signal in dependence on a respective drive voltage and the phase of the output of at least one modulator is shiftable. The split signals are recombined by an optical recombiner (12) to form an optical phase shift key output. The arrangement further comprises a phase modulator (20) adapted to chirp the optical phase shift key output.
Claims6
A modulator arrangement for modulating an optical signal using a differential quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system, comprising a laser for producing an optical signal of a selected wavelength, which signal is split by a splitter, each part of said split signal being applied to a respective phase modulator, each of which phase modulators is adapted to modulate only a phase of the signal in dependence on a respective drive voltage without substantially affecting the amplitude of the signal, the phase of an output of at least one modulator being shiftable, the split signals being recombined by an optical recombiner to form an optical phase shift key output, and means for chirping the optical phase shift key (PSK) output.
Dependencies are inferred from the claim text.