From California Eastern Laboratories - CEL

CTR is a key parameter in measuring transistor optocoupler performance. Normally expressed as a percentage, CTR is the ratio of the amount of current applied to the optocoupler's LED to the collector current received. This application note provides a method for simulating the effects of various CTRs in a circuit.
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Photodiodes
Photodiodes are used for the detection of optical power (UV, Visible, and IR) and for the conversion of optical power to electrical power.
Optocouplers
Optocouplers are capable of transferring an electrical signal between two circuits while isolating the circuits from each other.

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Avago Technologies - ACPL-054L Low Power Digital Optocoupler.
The ACPL-054L is a dual-channel, low power, low-input current, 1MBd digital optocoupler in an SO-8 footprint package. Separate connections for the photodiode bias and output transistor collector... (read more)
 

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