14 May 1993 Phase-bias tuning and extinction-ratio improvement of Mach-Zehnder interferometer
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Proceedings Volume 1932, Guided-Wave Optics; (1993); doi: 10.1117/12.145582
Event: Guided Wave Optics, 1992, Moscow, Russian Federation
Abstract
In order to reduce nonlinear distortions inserted in an analog optical system by an integrated-optic modulator (IOM) of interferometric type, it is necessary that the modulator phase bias be at the middle of the linear section of the modulation characteristic (MC). In this paper, a technique is presented that allows us to tune phase bias and extinction ratio in a wide range by adjusting a single-mode fiber (SMF) at the modulator input. The technique is based on excitation of the symmetric and asymmetric modes of the input Y-junction. The ratio of their amplitudes is tuned by changing coupling conditions (adjustment of the fiber) that results in tuning of phases and intensities of the waves in the interferometer arms. The technique can be applied for a Mach-Zehnder modulator of the conventional scheme (with a single-mode input waveguide section), but to strengthen the effect, it is useful to modify the modulator geometry.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert F. Tavlykaev, D. V. Baranov, Evgeny M. Zolotov, "Phase-bias tuning and extinction-ratio improvement of Mach-Zehnder interferometer", Proc. SPIE 1932, Guided-Wave Optics, (14 May 1993); doi: 10.1117/12.145582; https://doi.org/10.1117/12.145582
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