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10-GHz ultralow-noise optical sampling stream from a semiconductor diode ring laser

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4 Author(s)
DePriest, C.M. ; Sch. of Opt., CREOL, Orlando, FL, USA ; Braun, A. ; Abeles, J.H. ; Delfyett, P.J.

We report, what is to our knowledge, the lowest-noise pulsetrain produced to date with an actively mode-locked external-cavity semiconductor diode laser. Operating characteristics at 10 GHz include dispersion-compensated pulsewidths as short as 1.2 ps, amplitude noise as low as 0.12% rms, and residual phase noise as low as 43-fs rms. Potential application of such a laser in a next-generation optical analog-to-digital converter would theoretically provide as much as 8.6 bits of resolution, while sampling a 5-GHz waveform at the Nyquist frequency.

Published in:

Photonics Technology Letters, IEEE  (Volume:13 ,  Issue: 10 )