Mode-hop-free Tuning of a Chip-based Hybrid Integrated InP-Si3N4 Laser

Description

We demonstrate a novel method for mode-hop-free tuning of a narrow linewidth hybrid integrated InP-Si3N4 laser, in which the tuning range is not limited by the laser cavity’s free spectral range.

Chip-sized diode lasers with ultra-narrow spectral linewidth are of high interest for many applications, e.g. for phase encoding in optical communications and precision metrology [1,2]. Recently, a record-narrow intrinsic linewidth of 290 Hz was achieved with hybrid integration of an InP semiconductor optical amplifier (SOA) and a low-loss dielectric waveguide feedback circuit with a Vernier spectrally selective feedback filter that significantly extends the on-chip cavity length [3]. However, increasing the cavity length also reduces the cavity mode spacing, which causes undesired instabilities in the form of mode hops and power fluctuations when tuning the laser wavelength.

Period	24 Jun 2019
Event title	Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC 2019
Event type	Conference
Sponsors	EPS Young Minds, Quantum Electronics and Optics Division
Location	Munich, Germany, BavariaShow on map
Degree of Recognition	International