Direct modulation phase-shift-keying system and method

Details Direct modulation phase-shift-keying system and method Direct modulation phase-shift-keying system and method

H - Electricity

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H04B 10/04 (2006.01) H04B 10/145 (2006.01) H04B 10/148 (2006.01) H04B 10/155 (2006.01) H04L 27/18 (2006.01) H04L 27/20 (2006.01) H04L 27/22 (2006.01) H04L 27/227 (2006.01) H04L 27/233 (2006.01)

Patent

CA 2019178

ABSTRACT OF THE DISCLOSURE A direct modulation PSK system and method, in a coherent optical fiber transmission system, in which an injection current supplied to a laser diode is adapted to be directly varied is disclosed. In this system or method, a modulating current pulse is superposed on a bias current for the laser diode so that a specified phase condition may be satisfied. Thereby, a differential coding circuit and an external modulator being indispensable for a DPSK system become unnecessary and, in addition, the system becomes less susceptible to the influence of wavelength dispersion than the DPSK system and able to reproduce the carrier.

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