Semiconductor Ring Lasers.

Abstract : This program investigated the potential performance of triangular, monolithic, waveguide diode ring lasers (WDRL) for applications in high power, low-noise, short- to-medium-distance data transmission. This project illuminated many fascinating features of the physics of these devices, and has resulted in new methods for achieving unidirectionality in ring lasers. High power (10-20 mW), low-noise (-150 to -170 dBm) lasers appear feasible and provide low cost manufacturability and integrability. WDRLs integrated with small amplifiers showed 85 mW single mode outputs. Because these WDRLs are the first traveling wave lasers to operate entirely in single mode waveguide, they show a combination of attractive features not found in other lasers. Records include the first development of a nonreciprocal reflector concept and model for unidirectional ring lasers; high quality etched turning mirrors; record low threshold single mode ring lasers; record high ring laser external efficiency; and record high ring laser output power. This program investigated the potential performance of triangular, monolithic, waveguide diode ring lasers (WDRL) for applications in high power, low-noise, short- to-medium-distance data transmission. This project illuminated many fascinating features of the physics of these devices, and has resulted in new methods for achieving unidirectionality in ring lasers. High power (10-20 mW), low-noise (-150 to -170 dBm) lasers appear feasible and provide low cost manufacturability and integrability. WDRLs integrated with small amplifiers showed 85 mW single mode outputs. Because these WDRLs are the first traveling wave lasers to operate entirely in single mode waveguide, they show a combination of attractive features not found in other lasers.