Optical fibre receiver

Details Optical fibre receiver Optical fibre receiver

1986-01-30

1987-08-18

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

250214A, 330277, 330308, 330311, H04B 900

Patent

active

046882677

ABSTRACT:
An optical receiver, for use with optical fibre or for receiving a beam in free space, has its detector device, usually a PIN diode (D) connected in series with a resistor (R1) and to the base of a gallium arsenide field effect transistor (FET). Although the latter is satisfactory at most frequencies of operation, in certain load conditions, instability can occur at Gigahertz frequencies. To overcome this, the source-drain path of the FET is shunted by 50 ohm resistor (R2) in series with a capacitor (C) of about 5 nanofarads. In addition the FET is coupled to a bipolar transistor amplifier by a relatively long wire bond (L) which acts as an inductive impedance at the frequencies at which this instability occurs. These measures between them suppress this instability.

REFERENCES:
patent: 3449683 (1969-06-01), Gane
patent: 3541234 (1970-11-01), Austin
patent: 4189682 (1980-02-01), Sechi
patent: 4420724 (1983-12-01), Owen
patent: 4496908 (1985-01-01), Takano
patent: 4591803 (1986-05-01), Saleh
patent: 4620321 (1986-10-01), Chown

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