Optical receiver for subcarrier frequency division multiplexing

Details Optical receiver for subcarrier frequency division multiplexing Optical receiver for subcarrier frequency division multiplexing

1990-06-28

1991-09-03

Eisenzopf, Reinhard J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250214A, 330 59, 359195, H04B 1000

Patent

active

050461397

ABSTRACT:
The optical receiver includes a photodiode, a preamplifier and a length of transmission line. The photodiode may be connected to the preamplifier, either via the transmission line, or directly between the preamplifier and the transmission line, that is, the transmission line is connected as an open circuit. The transmission line 14 may comprise a coaxial cable, stripline, or any other suitable form of transmission line. The input impedance of the preamplifier should be designed to match the characteristic impedance of the transmission line. The noise of the preamplifier associated with the transmission line has a periodic spectrum dependent upon the length of the line with peaks at odd multiples of f' and minima at even multiples of f'. The value of f' is related to the length of the transmission line in accordance with: f'=v/4L where v is the propagation velocity, typically 2/3 the speed of light, and L is the length of the transmission line.

REFERENCES:
patent: 4075576 (1978-02-01), Eden
patent: 4498197 (1985-02-01), Chown
patent: 4744105 (1988-05-01), Kasper
patent: 4893300 (1990-01-01), Carlin et al.
Patent Abstracts of Japan, vol. 12, No. 187 (E-265)(3034) May 1988, & JP-A-62 290205 (NEC Corp) Dec. 17,1987.

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