Optical transmission apparatus

Details Optical transmission apparatus Optical transmission apparatus

1997-06-30

2000-02-08

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250214R, 330 75, H04B 1004

Patent

active

06023363&

ABSTRACT:
An optical transmission apparatus includes a feedback amplification circuit having flat and wideband frequency characteristics in which the linearity within a band is excellent. As a result, frequency characteristics of the optical transmission apparatus are improved. A feedback amplification circuit is structured with an amplifier including a transistor receiving an input signal at the base thereof, a first feedback path including a feedback resistance provided between the input terminal and the output terminal of the amplifier, i.e., between the base and the collector of the transistor, in which a substantial phase margin added with the feedback gain thereof is set to a value obtained by adding a predetermined value to 60 degrees, and a second feedback path including an emitter follower circuit composed of a transistor and a constant current source and a feedback resistance, in which a substantial phase margin added with the feedback gain thereof is set to a value obtained by subtracting said predetermined value from 60 degrees or an approximate value thereof, as the basis.

REFERENCES:
patent: 5565672 (1996-10-01), Siegal et al.
"Analysis and Design of Analog Integrated Circuits" pp. 115-118, P.R. Gray and R.G. Meyer translated bu Yuzuru Nagata; published by Baifukan.
R. Reimann et al, "A Single-Chip Bipolar AGC Amplifier with Large Dynamic Range for Optical-Fiber Receivers Operating up to 3 Gbit/s", IEEE Journal of Solid-State Circuits, vol. 24, No. 6, Dec. 1989, pp. 1744-1748.
M. Moller et al, "13 Gb/s Si-Bipolar AGC Amplifier IC with High Gain and Wide Dynamic Range for Optical-Fiber Receivers", IEEE Journal of Solid-State Circuits, vol. 29, No. 7, Jul. 1994, pp. 815-822.

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