Opto-Electronic Signal Processing Element
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Proposed is an opto-electronic signal processing element consisting of fiber-optic delay lines combined with a photodiode matrix. The element allows to logically combine optical pulses of a serial pulse stream. It may, e.g., be used in a time-division demultiplexer having a large line rate achievable without the need for electronic device speeds corresponding to the large bandwidth. The basic circuits, providing for logic AND and OR functions, respectively, are illustrated in Fig. 1. An optical pulse stream arriving at input A is fed, via optical fibers, to photodiode D1 and, delayed in delay element xT, to photodiode D2. The AND function is performed in a series connection of diodes, the OR function in a parallel arrangement.