Chinese Optics Letters, Volume. 20, Issue 8, 081201(2022)
Four-quadrant demodulation fiber sensor for wavelength monitoring of a wavelength phase-shifting interferometer
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Fig. 1. Optical path of the laser wavelength monitoring for the wavelength phase-shifting interferometer.
Fig. 2. Physical photo of interferometer wavelength monitoring system based on the four-quadrant modulation wavelength sensor.
Fig. 3. (a) Original intensity signals collected by the four-quadrant detector and (b) the normalized intensity signals, (c) the demodulated signals, and (d) wavelength monitoring results of the tunable laser.
Fig. 5. (a) Changes of the modulation voltage and output signals on the four-quadrant detector with time and (b) changes of the unwrapped phase and the relative wavelength with time.
Fig. 6. (a) Output signal and (b) demodulation signal of the wavelength sensor without laser modulation.
Table 1. The Orientation Parameters of the Polarization Devices
View tableView in ArticleTable 1. The Orientation Parameters of the Polarization Devices
Devices Parameters Specification PBS2 Slow axis orientation of the common port fiber to that of the port fiber PBC Slow axis orientation of the common port fiber to that of the port fiber 0° or QWP Slow axis orientation of the QWP to that of the common port fiber of the PBC Four-quadrant polarizer Transmission axis orientations of the polarizers in each quadrant 0°/45°/90°/135°
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Xiaoqin Shan, Xingyue Fan, Zhigang Han, Jin Wang, Fengrui Li, Rihong Zhu. Four-quadrant demodulation fiber sensor for wavelength monitoring of a wavelength phase-shifting interferometer[J]. Chinese Optics Letters, 2022, 20(8): 081201
Paper Information
Category: Instrumentation, Measurement, and Optical Sensing
Received: Mar. 8, 2022
Accepted: May. 7, 2022
Posted: May. 9, 2022
Published Online: May. 27, 2022
The Author Email: Zhigang Han (hannjust@163.com)
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