H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/00 (2006.01) H04B 10/148 (2006.01) H04L 27/22 (2006.01)
Patent
CA 1308440
ABSTRACT An optical receiving method utilizing polarization diversity is disclosed in which first and second reference lightwaves having different frequencies and having polarization planes substantially perpen- dicular to each other, are combined with a signal lightwave to form a combined lightwave, the combined lightwave is subjected to heterodyne detection to obtain a detection signal, the detection signal is separated into first and second intermediate-frequency signals having different carrier frequencies, the first and second intermediate-frequency signals are converted into first and second baseband signals, respectively, and the first and second baseband signals are added to obtain an output signal.
561067
Imoto Katsuyuki
Maeda Minoru
Sano Hirohisa
Takasaki Yoshitaka
Takase Akihiko
Hitachi Ltd.
Kirby Eades Gale Baker
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