28 April 1995 New concept of single-mode resonator for distributed feedback semiconductor and fiber lasers
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Abstract
The new concept of a single-mode resonator for single-frequency distributed feedback (DFB) lasers is presented. This concept is based on an embedded nonharmonic distributed Bragg structure with a sinusoidally modulated coupling coefficient, which is a combination of two superimposed sinusoidal Bragg gratings of equal heights and slightly different periods. Resonant frequencies and corresponding threshold gains of such a distributed resonator are calculated theoretically by using the coupled-mode theory. The designed resonator provides stable single-frequency oscillation and has lasing characteristics (frequencies and thresholds) very similar to those of a well-known distributed resonator with quarter-wavelength shift. The developed concept of a resonator with a sinusoidally modulated coupling coefficient can be applied both to semiconductor laser diodes with incorporated Bragg relief grating and to DFB fiber lasers with refractive index grating. The important advantage of designed new single- mode Bragg structure, as compared to quarter-wavelength-shifted structure, is that it can be fabricated very easily on semiconductor surfaces and in photosensitive fibers by direct three- beam holographic writing.
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Vladimir N. Seminogov, Vladimir N. Seminogov, Alexander I. Khudobenko, Alexander I. Khudobenko, Vladislav Ya. Panchenko, Vladislav Ya. Panchenko, Victor I. Sokolov, Victor I. Sokolov, } "New concept of single-mode resonator for distributed feedback semiconductor and fiber lasers", Proc. SPIE 2382, Laser Diodes and Applications, (28 April 1995); doi: 10.1117/12.208461; https://doi.org/10.1117/12.208461
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