Injection Characterization of Packaged Bi-Directional Diamond Shaped Ring Laser at 1550 NM
Conference paper postprint
AIR FORCE RESEARCH LAB ROME NY SENSORS DIRECTORATE
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The Air Force Research Laboratory. Binoptics Corp. and Infotonics Technology Center worked collaboratively to package and characterize recently developed diode based ring lasers that operate at 1550 nm in a diamond shaped cavity. The laser modes propagate bi-directionally however. uniaxial propagation may be induced by optical injection or by integrating a mirror. Round trip cavity length was 500 microns in 3.5 microns wide ridge waveguides, and four polarization maintaining lensed fibers provided access to the input and output modes. A signal from a tunable diode laser. incident at one port. served to injection lock both of the counter-propagating circulating modes. When the input signal was time-encoded by an optical modulator, the encoding was transferred to both modes with an inverted time-intensity profile. Performance. in terms of fidelity and extinction ratio. is characterized for selected pulsed and monochromatic formats from low frequencies to those exceeding 12 GHz. A rate equation model is proposed to account for certain aspects of the observed behavior and analog and digital applications are discussed.
- Lasers and Masers