Injection characterization of packaged bi-directional diamond shaped ring lasers at 1550 nm

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Title: Injection characterization of packaged bi-directional diamond shaped ring lasers at 1550 nm
Author: Bussjager, Rebecca; Erdmann, Reinhard; Kovanis, Vassilios; McKeon, Brian; Fanto, Michael; Johns, Steve; Hayduk, Michael; Osman, Joseph; Morrow, Alan; Green, Malcolm; Stoffel, Nancy; Tan, Songsheng; Shick, Charles; Bacon, Wesley; Beaman, Bryan
Abstract: 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 μm in 3.5 μm wide ridge waveguides, and four polarizationmaintaining 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 timeencoded 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.
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Date: 2006-05-12

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