ASK optical transmitter

Details ASK optical transmitter ASK optical transmitter

1993-03-25

1994-09-27

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359184, 375 24, 332116, H04B 1004

Patent

active

053511492

ABSTRACT:
An amplitude-shift-keyed (ASK) optical transmitter is described for generating an ASK modulated infrared signal from a light-emitting-diode (LED). The transmitter includes a DC powered microcircuit for generating an ASK modulation signal. A pair of mosfet devices are connected in series with one or more LED's between the mosfets. An oscillator signal used to operate the microcircuit is also employed as a carrier signal to activate one mosfet while the ASK modulating signal is coupled to operate the other mosfet. Input capacitances of the mosfets are used to tune the oscillator signal and smooth the leading and trailing edges of the ASK modulation signal. Several embodiments are described.

REFERENCES:
patent: 3846705 (1974-11-01), Davis
Kowano et al. "100 ps Frequency Switching Without Bit Loss for a 10 Gb/S ASK Modulated Signal" IEEE Photonics Technology Letters, vol. 5, No. 3, Mar. 1993, pp. 354-356.

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