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High-speed (/spl ges/1 GHz) electrical and optical adding, mixing, and processing of square-wave signals with a transistor laser

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5 Author(s)
Milton Feng ; Dept. of Electr. & Comput. Eng., Univ. of Illinois, Urbana, IL ; Holonyak, N. ; Chan, R. ; James, A.
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This letter reports the common-emitter operation (gain beta=DeltaIC/DeltaIB>1, 20degC, IB =36 mA, lambda=970 nm) of a dual-input transistor laser, arranged with a separate base contact on either side of a single emitter, that adds, mixes, and processes high-speed square-wave electrical inputs and delivers separate electrical and optical outputs. Applying a square-wave electrical input X1(t) to one base contact and X2(t) at a second base input, we obtain, with the pulsewidth modulated because of mixing, an electrical output proportional to betatimes[X1(t)+X2(t)] and a laser output tracking the electrical output (hnutimesf[X1(t)+X2(t)]) and exceeding it in bandwidth (pulse sharpness)

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 11 )

Date of Publication:

June 2006

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