80-GHz AlGaInAs/InP 1.55µm colliding-pulse mode-locked laser with low divergence angle and timing jitter

Abstract

We present an 80‐GHz λ ∼ 1.55 µm passively colliding‐pulse mode‐locked laser based on a novel AlGaInAs/InP epitaxial structure, which consists of a strained 3‐quantum‐well active layer incorporated with a passive far‐field reduction layer. The device generated 910 fs pulses with a state‐of‐art timing jitter value of 190 fs (4–80 MHz), while demonstrating a low divergence angle (12.7°×26.3°) with two fold butt coupling efficiency to a flat cleaved single mode fiber when compared with the conventional mode‐locked laser. (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)

80 GHz AlGaInAs/InP colliding-pulse mode-locked laser with high pulse power

“…The results are the highest pulse energy and peak power obtained in 80 GHz 1.55 µm monolithic SMLLs. 8,19,21,22) The optical spectrum shown in Fig. 11 is centered at 1569.24 nm with a −3 dB bandwidth of 2.4 nm and a mode spacing of 80.06 GHz, which is consistent with the reciprocal of the pulse duration in Fig.…”

“…We should note that it is larger than 0.91 ps in Ref. 19, which is probably due to the higher current injection. At I gain = 200 mA and V SA = −1.2 V, the average power is 26 mW and the pulse energy is 0.33 pJ.…”

“…The slope efficiency is 0.19 W=A at V SA = 0 V, which is close to that of the three quantum well structures. 19) The increase of V SA raises the threshold current and reduces the slope efficiency, which is due to an increase in inter-band and exciton absorption.…”

“…V SA is lower and I gain is higher for ML compared with that of the modelocked laser with a short SA. 19) The full width at half- maximum (FWHM) of the pulses as a function of both I gain and V SA is shown in Fig. 8.…”

Power and spectra polarization of large-aperture rectangular-shaped vertical-cavity top-emitting lasers

“…Aiming at improving the output power of VCSEL, multi ring shaped aperture structure was recently reported to achieve high power three times than single large aper ture [18]. And low beam divergence was obtained in colliding pulse mode locked lasers [19].…”