Bi-directional optical wireless communication apparatus and meth

Details Bi-directional optical wireless communication apparatus and meth Bi-directional optical wireless communication apparatus and meth

1996-06-17

1999-07-20

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359132, 359158, 359143, H04J 1402

Patent

active

059263024

ABSTRACT:
A bi-directional optical wireless communication apparatus comprises a modulator outputting a narrow band signal whose center frequency is selected from N center frequencies, an optical transmitter transmitting an optical signal from the narrow band signal, an optical receiver for receiving N optical signals, N receiving circuits corresponding to the N center frequencies, a cancelling circuit for cancelling the optical signal received by the optical receiver via reflective object in received N optical signals using the narrow band signal in accordance with a magnitude of the optical signal received by the optical receiver, a frequency discriminator discriminating frequencies of the received N optical signals, and a control circuit. The frequency discriminator discriminates for an interval that the optical transmitter does not transmit the optical signal. Then, the modulating circuit continuously outputs a received signal from one of N receiving circuits corresponding to the discriminated frequency and the modulator modulates the narrow band signal to have a center frequency other than the discriminated frequency under control of the control circuit. The interval is repeated with a repetition randomly set interval.

REFERENCES:
patent: 5075792 (1991-12-01), Brown et al.
patent: 5349463 (1994-09-01), Hirohashi et al.
patent: 5600471 (1997-02-01), Hirohashi et al.

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