Bidirectional fiber optic transmission systems and photodiodes f

Details Bidirectional fiber optic transmission systems and photodiodes f Bidirectional fiber optic transmission systems and photodiodes f

1982-09-10

1985-01-08

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455607, H04B 900

Patent

active

044931131

ABSTRACT:
A single-wavelength, bidirectional fiber optic transmission system is described in which at each terminal the output radiation of a light source (LED or semiconductor laser) is coupled through a small diameter hole in the active area of a photodiode into the core of a larger diameter transmission fiber. On the other hand, radiation propagating through the fiber in the opposite direction exits from the fiber with a large NA so that most of it is incident on the active area of the photodiode and little is lost through the hole. Also described are a number of photodiode configurations for use in such a system, as well as dual photodiodes to perform both signal detection and output monitoring functions.

REFERENCES:
patent: 3877060 (1975-04-01), Shono et al.
patent: 4181901 (1980-01-01), Heyke
patent: 4292512 (1981-09-01), Miller et al.
Takahashi, H. et al., "Optical Two-Way TV Transmission", Optics Letters, vol. 4, No. 1, Jan. 1979, pp. 24-26.
Ostermayer et al., "Photoelectrochemical Etching of p-GaAs", Applied Physics Letters, vol. 39, No. 1, 1981, pp. 76-78.
Wells, H., "Crosstalk in a Bidirectional Optical Fiber", Fiber and Integrated Optics, vol. 1, No. 3, 1978, pp. 283-286.
Laser Focus, "PS-Noted in Passing-Communication Research", May 1978, p. 109.

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