Pseudorandom pulse code generators using electro-optical XOR gat

Details Pseudorandom pulse code generators using electro-optical XOR gat Pseudorandom pulse code generators using electro-optical XOR gat

1989-07-17

1990-05-22

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

350 9614, 331 78, 364713, 364717, H04L 902

Patent

active

049283103

ABSTRACT:
Pseudorandom pulse code generators utilize XOR gates constructed of a pair of back to back parallel connected laser diodes, and fiber optic delay lines connecting the XOR gates to generate PN code sequences with tens of Gbits/s data rates. The single tap generator uses a fiber optic line of a length representing a selected number of delay stages connected to the optical output of the XOR gate and with optical splitters at the end of the delay line and at a selected delay stage feeding back optical signals to the optical inputs of the XOR gate to produce the PN sequence at the end of the delay line. Multi-tap generators utilize additional electro-optical XOR gates connected in serial-parallel, or preferably in a converging cascade arrangement to feed back pulses to the delay line. A syncopated PN code generator uses the electro-optical XOR gates to multiplex codes generated by syncopated pairs of relatively slow electronic shift register code generators with the required phase shifting provided by diffeence in the lengths of the optic fibers connected successive stages of XOR gates.

REFERENCES:
patent: 3681708 (1972-08-01), Olmstead
patent: 3691472 (1972-09-01), Bohman
patent: 3995311 (1976-11-01), Taylor
patent: 4531022 (1985-07-01), Pioli
patent: 4632518 (1986-12-01), Jensen
patent: 4712089 (1987-12-01), Verber
patent: 4833633 (1989-05-01), Morris
H. F. Taylor, "Guided Wave Electrooptic Devices For Logic And Computation".
"Applied Optics", May 15, 1978; vol. 17, No. 10, pp. 1493-1498.

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