J Jing Zhao

Stability of a monolithic integrated filtered-feedback laser.

We experimentally and theoretically investigate the stability of a single-mode integrated filtered-feedback laser as a function of the electrically controlled feedback phase. We interpret the measurements in terms of feedback-induced dynamics, compare them with the results from a stability analysis model for conventional feedback, and find good qualitative agreement.

Monolithic integrated filtered-feedback multi-wavelength laser

A novel multi-wavelength laser monolithically integrated on InP is presented. The device consists of four channels of Fabry-Pérot lasers using two-port multimode interference reflectors (MIRs) and a single mode operation for each channel is realized by the filtered-feedback from arrayed waveguide grating(AWG).

Novel lasers using multimode interference reflector

We present a novel laser using multimode interference (MMI) reflectors. By using the MMI reflectors to form the laser cavity, the laser light is available on the chip, which makes the lasers very promising building blocks in photonic integrated circuits (PIC). These lasers are one of the first InP PIC devices fabricated in a generic multi-project wafer run.

Feedback Phase Influence on an Integrated Filtered-Feedback Laser

The stability of a novel monolithically integrated filtered-feedback laser is experimentally investigated as a function of the electrically controlled feedback phase. By backing them up with the results from a stability analysis model, we interpret the measurements in terms of feedback-induced dynamics. We show that this laser has excellent potential for narrow linewidth.

Laser research on an InP-based generic integration platform

In Europe a number of technology platforms for generic integration are being created for photonic integrated circuits (PICs); in Silicon, in passive dielectrics, and in Indium Phosphide. Such platforms are on the brink of commercialization, they offer a range of calibrated building blocks from which application specific PICs can be built and allow simplified, reduced cost access to a standardised technology, but presently only InP based platforms allow the integration of optical gain blocks; the essential feature of a semiconductor laser. The wavelength is constrained by the platform, usually C-band, but in the near future we expect other wavelengths in the 1.3μm-2.0μm range will be addressed. A frozen platform technology may not seem an ideal starting point for novel laser research but for what may be appear to be lost in epitaxial and process flexibility, much more is gained through a new-found ability to build up complex circuits quickly to deliver new and interesting laser based functionality. Building blocks such as reflectors (a distributed Bragg reflector (DBR) or a multimode interference reflector (MIR)), an amplifier section, and passive waveguides, can be built up by designers into integrated semiconductor lasers of a wide variety of types. This ready integration of novel sources with other circuit functionality can address a wide range of applications in telecoms, datacoms, and fibre based sensing systems. In this paper we describe a number of recent developments on generic InP-based platforms ranging from the fabrication of simple Fabry-Perot lasers, through tuneable DBR lasers, multi-wavelength comb lasers, picosecond pulse lasers and ring lasers.