Pity the schematic text in this pdf is so blurry

http://www.edn.com/contents/images/92602di.pdf

Quite a few others found with Google - LED "light detector"

eg

http://laser.physics.sunysb.edu/~tanya/report2/

This one mentions half-duplex data transmission

http://www.fiber-optics.info/articles/detector.htm

and this one talks of response times of a few ns

http://link.aip.org/link/?RSINAK/69/3751/1

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