WDM optical communication wherein optical beams are modulated by

Details WDM optical communication wherein optical beams are modulated by WDM optical communication wherein optical beams are modulated by

1991-01-22

1993-03-02

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359128, H04J 1402

Patent

active

051914573

ABSTRACT:
In a wavelength division multiplexed optical communication network which includes a transmitter including a multiplexing arrangement (15-17) for wavelength division multiplexing signal beams of a plurality of channels into the multiplexed signal beam for reception by at least one receiver (12) capable of producing a data carrying intermediate frequency signal by using a local optical beam in receiving the signal beam of a selected channel, the transmitter comprises a modulating arrangement (15) for frequency modulating optical beams of the channels into frequency modulated beams by channel discrimination signals (18) having different frequencies in correspondence to the channels before (19) the signal beams are multiplexed. Besides a receiving arrangement (21-25, 31-32, 35-38) for producing the data carrying intermediate frequency signal and prior to production thereof an information carrying intermediate frequency signal by using the local optical beam in receiving a multiplexed optical beam into which the frequency modulated beams are wavelength division multiplexed, the receiver comprises a detecting arrangement (26, 33-34) for detecting one of the channel discrimination signals in the information carrying intermediate frequency signal in correspondence to one of the channels that should be received as the selected channel. Besides a receiver circuit (21-25) and a level detector (31), the receiving arrangement comprises a scrambling (32, 35, 36) and a sweeping (35, 37, 38) arrangements.

REFERENCES:
patent: 4841519 (1989-06-01), Nishio
patent: 4882775 (1989-11-01), Coleman
patent: 4903342 (1990-02-01), Yamazaki
patent: 4933929 (1990-06-01), Tajima
patent: 5010587 (1991-04-01), Eklund

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