J. Lasri et al., Frequency locking at 50-GHz spacings using optoelectronic mixing in photoheterojunction bipolar transistors, IEEE PHOTON, 11(10), 1999, pp. 1298-1300
We describe optoelectronic mixing in a photohetero-junction bipolar transis
tor to frequency lock two single-mode lasers at a frequency spacing of 50 G
Hz, We demonstrate high locking stability with an uncertainty in the detuni
ng frequency of only a few megahertz.