Dual-Wavelength InAlGaAs–InP Laterally Coupled Distributed Feedback Laser

Abstract

The design and operation of a novel dual-wavelength laterally coupled (LC) distributed feedback (DFB) semiconductor laser are reported. The laser has two different grating periods, one on each sidewall. Stable dual-mode emission, with low threshold currents and good extinction ratio approaching 30 dB, has been demonstrated. Generation of millimeter-wave signals by photomixing has been performed, and the linewidths of each of the individual modes and of the beat mode have been measured as a function of the injection current. It is observed that while the linewidth of the separate modes has a modest dependence on the injection level, the linewidth of the beat mode experiences a strong decrease as the injected current increases.

Advanced Fabrication of Single-Mode and Multi-Wavelength MIR-QCLs

“…Ideally, the source can still emit several wavelengths in the same ridge but benefits from high output power and low power consumption. Such device concepts have been proposed previously for quantum-well and quantum-cascade lasers [50][51][52], however, they were incapable of single-wavelength emission and/or the two wavelengths were in close spectral proximity.…”

Nanoimprint Lithography - Next Generation Nanopatterning Methods for Nanophotonics Fabrication

“…This generates distributed feedback. Laterally coupled laser diodes are highly interesting in conventional applications (Abe et al 1995), quantum cascade lasers (Williams et al 2005 andGolga et al 2005), terahertz generation (Pozzi et al 2006) and photonic integrated circuits . The main reasons for widespread interest towards this technology is that DFB-lasers based on laterally coupled gratings can be made without regrowth.…”

A Dual-Grating InGaAsP/InP DFB Laser Integrated With an SOA for THz Generation

“…Up to now, several kinds of light sources have been proposed for this application, such as combining the output from two discrete single frequency distributed feedback (DFB) semiconductor lasers [4], [5], multi-section DFB dual mode semiconductor laser (DML) [6]- [9] and dualwavelength distributed Bragg reflector (DBR) lasers [7]， [8]. One section DMLs with simultaneous two longitude modes emission within a single laser cavity have also been reported [10]， [11]. This kind of DML is very attractive because of their compactness, stability and spectral quality.…”

“…Thus better stability and spectral quality of devices having our structure can be expected. However, in the reported one section DMLs [10]， [11], two gratings with different periods are formed on each side of the ridge waveguide to achieve the two emission wavelengths. Because the waveguide is only several microns in width, e-beam lithography facility is needed for fabricating the gratings, which is known as being not suitable for mass production of optoelectronic devices.…”