Dynamic range of a coherent optical spectrum analyzer with a liquid-crystal matrix signal-input device

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Дюбов А.С., Кузьмин М.С., Рогов С.А. Динамический диапазон когерентного оптического спектроанализатора с жидкокристаллической матрицей для ввода сигналов // Оптический журнал. 2023. Т. 90. № 2. С. 78–88. http:doi.org/10.17586/1023-5086-2023-90-02-78-88

Diubov A.S., Kuzmin M.S., Rogov S.A. Dynamic range of a coherent optical spectrum analyzer with a liquid-crystal matrix signal-input device [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 2. P. 78–88. http:doi.org/10.17586/1023-5086-2023-90-02-78-88

For citation (Journal of Optical Technology):

A. S. Diubov, M. S. Kuzmin, and S. A. Rogov, "Dynamic range of a coherent optical spectrum analyzer with a liquid-crystal matrix signal-input device," Journal of Optical Technology. 90(2), 98-104 (2023). https://doi.org/10.1364/JOT.90.000098

Abstract:

Subject of study. The paper investigates the dynamic range of a coherent optical spectrum analyzer with a liquid-crystal signal-input device. Aim of study. The goal is the theoretical and experimental assessment of the false signal levels at the spectrum analyzer output. The purpose is to experimentally determine the value of the dynamic range. Method. A theoretical analysis of the spectral components in the output signal is performed based on the representation of the transmission dependence of a liquid-crystal input device in the light amplitude on the input control signal in the form of an expansion in a series of power functions in proximity of the operating point. The output signals of the spectrum analyzer were experimentally registered and the values of the dynamic range were determined for the cases of one-, two- and three-frequency input signals. Main results. A calculating technique for the false signal levels at the output of an optical spectrum analyzer with a liquid-crystal matrix signal-input device is proposed, and its dynamic range is measured. Practical significance. More than 40 dB dynamic range is achieved for a three-frequency input signal.

Keywords:

optical signal processing, coherent optical spectrum analyzer, dynamic range, liquid-crystal spatial light modulator, raster signal input

OCIS codes: 070.0070, 070.6120, 070.4790, 100.4550, 070.4550

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