AN ARRANGEMENT FOR INCREASING THE DYNAMIC RANGE AT THE INPUT STAGE OF A RECEIVER IN AN OPTICAL FIBRE INFORMATION TRANSMISSION SYSTEM.

摘要

PCT No. PCT/SE81/00238 Sec. 371 Date Apr. 5, 1982 Sec. 102(e) Date Apr. 5, 1982 PCT Filed Aug. 25, 1981 PCT Pub. No. WO82/00931 PCT Pub. Date Mar. 18, 1982.A method and arrangement in the receiver of an optical fibre information transmission system for increasing the dynamic range in a so-called transimpedance-type input stage. The optical input of the arrangement has a non-amplifying photodiode (3) with two poles or terminals (8,9) e.g. a so-called pin-diode, which is connected by one pole (8) to the input on a high-impedance amplifier (1) with feedback between input and output (7) via a resistance (4). The amplifier output signal is fed back via a signal path, in the form of an integrator (2) connected between the output (7) and the other pole (9) of the photodiode and a capacitance (5) in parallel with the photodiode (3), to the amplifier input.