Method for optical communications

Details Method for optical communications Method for optical communications

1995-05-25

1996-11-19

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359184, 359173, 356 731, H04B 1008

Patent

active

055768717

ABSTRACT:
There is provided a method for optical telecommunications with which an optical signal modulated for the plane of polarization can be received for certain without lowering the threshold level and being affected by noises so that any optical telecommunications can be identified without fail. With the method, an optical signal is modulated by continuous pulses a at the transmitting side before transmission and a predetermined number (n) of pulses a are extracted within a given period of time in synchronism at the receiving side so that the presence of a modulated optical signal is acknowledged only when the number of pulses a received within the given period of time is smaller than the predetermined number (n) but greater than another predetermined number (m) (n.gtoreq.m). This method may be so modified that the absence of a modulated optical signal is acknowledged even when the above defined number of pulses are received if k or more than k (k.gtoreq.1) noise signals b are found between any successive two of the received pulses.

REFERENCES:
patent: 4840482 (1989-06-01), Shigematsu et al.
patent: 5202746 (1993-04-01), Sentsui et al.
patent: 5329348 (1994-07-01), Nimura et al.
patent: 5331392 (1994-07-01), Fujisaki et al.

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