Wide-band residual phase-noise measurements on 40-GHz monolithic mode-locked lasers

• Published in: IEEE photonics technology letters Vol. 17; no. 11; pp. 2388 - 2390
• Main Authors: Larsson, D., Yvind, K., Hvam, J.M.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-11-2005; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuits; Electric variables measurement; Extrapolation; Jitter; Laser mode locking; Laser noise; Lasers; mode-locked laser diode; Nyquist frequencies; optical communications; Performance evaluation; Phase measurement; Quantum well lasers; Quantum wells; Semiconductor lasers; Semiconductors; Timing jitter; Waveguide lasers; Wideband
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2005.857983

We have performed wide-band residual phase-noise measurements on semiconductor 40-GHz mode-locked lasers by employing electrical waveguide components for the radio-frequency circuit. The intrinsic timing jitters of lasers with one, two, and three quantum wells (QW) are compared and our design prediction, concerning noise versus number of QWs, is for the first time corroborated by experiments. A minimum jitter of 44 fs is found, by extrapolating to the Nyquist frequency, for the one-QW device, having nearly transform-limited pulses of 1.2 ps. This jitter is nearly three times lower than for a three-QW laser. There is good agreement between the measured results and existing theory.