H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/04 (2006.01) G02F 2/00 (2006.01) H04B 10/00 (2006.01) H04L 5/06 (2006.01) H04L 25/497 (2006.01) H04L 27/02 (2006.01)
Patent
CA 2295390
A binary signal is encoded to produce a three-level encoded signal having reduced bandwidth and small low frequency and d.c. components, e.g. using modified duobinary encoding, the encoded signal directly modulating a semiconductor laser to produce a frequency modulated optical signal, which is passed through an interference filter to provide two-state amplitude modulation from the three-state frequency modulation for direct recovery of the binary signal by an optical receiver, the interference filter providing constructive and destructive interference for frequencies corresponding to binary one and zero bits respectively. An array transmission system can be provided by combining multiple such frequency modulated optical signals, from multiple lasers with respective central frequencies and respective encoders for multiple binary signals, using an array waveguide which also serves as a channel frequency filter, with a single interference filter. Polarization modulation instead of frequency modulation, and external modulation of an optical signal from an optical source, are also described.
Habel Richard R.
O'sullivan Maurice S.
Roberts Kim B.
Nortel Networks Corporation
Nortel Networks Limited
Smart & Biggar
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