Tailoring chirp in spin-lasers

Tailoring the coherence length of diode lasers

The control of the coherence properties of laser light is a major success factor in many photonic applications – in areas as diverse as spectroscopy and optical pumping of atoms, nonlinear frequency conversion, interferometry, or laser-based imaging. Established diode laser technology has however only covered individual points of the “coherence length spectrum”. Recently developed electronic te...

Linewidth enhancement factor and chirp in quantum dot lasers

Self-injected semiconductor distributed feedback lasers for frequency chirp stabilization.

It is well known that semiconductor distributed feedback lasers (DFB) are key devices for optical communications. However direct modulation applications are limited by the frequency chirp induced by current modulation. We demonstrate that a proper external control laser operation leads to chirp-to-power ratio (CPR) stabilization over a wide range of modulation frequencies as compared to the fre...

Pulsewidth and Chirp of SOA-EAM Ring Mode-Locked Lasers

Generation of high-quality short pulses at repetition rates in the GHz range is a key function for OTDM and WDM transmission and signal processing systems. In particular, active mode-locking can be used to produce stable and well synchronized ultrashort pulses suitable for such applications. In this paper, an analytical model of an actively modelocked SOA-EAM ring laser is derived and used to p...

Spin-polarized surface-emitting lasers

We investigate the growth, fabrication, and characterization of an electrically-injected spin-polarized laser utilizing an Fe/n+-Al0.1Ga0.9As Schottky tunnel barrier for efficient spin injection into an InGaAs quantum well vertical-cavity surface-emitting laser. A threshold current reduction of 11% and maximum degree of circular polarization of 23% are observed for a 15 μm mesa diameter laser a...