Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-04-09
1981-08-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
357 19, G02B 2700
Patent
active
042848849
ABSTRACT:
An electro-optic device for stabilizing the output level of a Burrus-type light emitting diode (LED) utilizes a photodiode to monitor side emission from an active region of the LED. Side emission closely tracks top emission, which is launched into an output fiber. An electrical analog is derived from the monitored side emission and is applied in a feedback loop to control modulation level or bias current to the LED. In this way, peak optical output (for digital systems) or r.m.s. output and linearity (for analog systems) is stabilized. The monitoring photodiode and the LED may be spatially separate or may form a unitary structure.
REFERENCES:
patent: 4125777 (1978-11-01), O'Brien et al.
Dyment John C.
Kovats Tibor F. I.
Sinclair William J.
Springthorpe Anthony J.
Straus Jozef
Hostetter Darwin R.
Nelms David C.
Northern Telecom Limited
Wilkinson Stuart L.
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