Design and realization of high-power ripple-free superluminescent diodes at 1300 nm

1.3-W ripple-free superluminescent diode

“…Antireflection (AR) facet coating [2] is an alternative technique of reducing facet reflectivity, but in this case the inconvenience is that expensive multilayer AR coatings have to be designed to drastically reduce facet reflectivity. Tilting [3], or bending [4] the injection contact with respect to the output facet may be effective for reducing optical feedback, but the undesired effect here is that spatial output field profile is asymmetric, thereby reducing coupling efficiency. On the other hand, the etched deflector introduced in [5] is a simple and inexpensive method for effectively reducing the rear facet reflectivity even for high-power operation.…”

Measurement of junction temperature and thermal resistance in InGaAlAs/AlGaAs quantum-well superluminescent diodes (SLDs)

“…A superluminescent diode is a diode in which there is spontaneous emission with amplification, but insufficient feedback for oscillations to build up to achieve lasing action. 1 Broadband SLDs are highly desired for applications including fiber-optic gyroscope (FOG), 2 optical coherence tomography (OCT), 3 optical time-domain reflectometers (OTDR) 4 and wavelength-division-multiplexing systems (WDM). 5 High-power SLDs have been one of main issues based on quantum well structures, and thermal management is one of the critical issues for stable operation and long-term reliability.…”

GaAs-based self-aligned stripe superluminescent diodes processed normal to the cleaved facet

“…Windows are inherently broad-band and can be further combined with AR coatings and tilted waveguides to offer Reff below 10 -5 [3]. Furthermore, the use of absorbing sections to reduce Reff below 10 -6 has been shown, using bent passive absorbers [4,5], or grounded absorbers [6]. With respect to ridge waveguide approaches, buried ridge or stripe methods allow for narrow active widths and control of carrier flow, reduced non-radiative recombination at exposed surfaces, and greater control of the optical beam profile allowing for improved coupling to fibre.…”