| 摘要 |
1531263 Optoelectronic device for optical repeaters XEROX CORP 24 Oct 1975 43925/75 Heading G1A [Also in Division H1] An optoelectronic device comprises lightsensitive and light-emitting semi-conductor junction diodes 8, 9 and 9, 10 respectively the light emitting diode being arranged to emit light 16 in response to the electric current produced by the lightsensitive diode and disposed so that part of the emitted light 15 is incident upon the light-sensitive diode 8, 9, thus providing positive feedback, a threshold of operation also being provided by e.g. a resistor (7), Fig. 1 (not shown) shunted across the L.E.D. The device may comprise an avalanche photodiode (17), Fig. 3 (not shown) and a semiconductor lasing region (18) formed side by side on a common substrate 19. When a number of devices are used as repeaters along an optical fibre cable each light-emitting diode may emit light of a longer wavelength than the preceding one and each light-sensitive diode made sensitive only to wavelengths ranging from that received from the previous repeater up to that emitted by its associated light-emitting diode. This prevents optical feedback between the output of one repeater and the input of the previous one.
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