H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/00 (2006.01) H04B 10/142 (2006.01) H04L 25/49 (2006.01) H04L 27/10 (2006.01)
Patent
CA 1306010
H-223 ABSTRACT OF THE DISCLOSURE A unipolar original electrical signal is encoded by alternate mark inversion and combined with a DC bias current for injection of a semiconductor laser to produce a bipolar FSK optical signal that is transmitted to a receiver. At the receiver, the received signal is coupled with optical local power and fed to an optical/electrical transducer, preferably a semiconductor, to produce an electrical signal that is demodulated to produce the original unipolar signal. The demodulator may be of different types, for example employing delaying part of the amplified electrical signal and mixing the delayed part wish the original signal for passage of the combined signal through a low pass filter; with proper selection of the delay, an AMI decoder is not needed. The demodulator may also be of the type that has one or more band pass filters to respectively separate the positive mark, space and negative mark signals that may thereafter be added. Filtering and polarization beam splitting may also be used in the demodulator for improving the signal-to-noise ratio and preventing other types of degradation. 38
588834
Sasaki Shinya
Tsushima Hideaki
Hitachi Ltd.
Kirby Eades Gale Baker
LandOfFree
Optical transmitter, optical receiver and optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical transmitter, optical receiver and optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical transmitter, optical receiver and optical... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1305947