10 January 2018 An optical tunable filter array based on LCOS phase grating
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This paper reports an optical tunable filter array (TFA) based on a LCOS (liquid crystal on silicon) chip. The input broadband optical beam is first dispersed by a bulk grating and then incident on the LCOS chip. The LCOS chip is phase-only modulated and constructed as a dynamic reflective phase grating. The phase modulation is adjusted to meet the Littrow angle for a specified passband wavelength and thus the optical beam corresponding to this wavelength is steered to the output. The input/output optical beams are coupled to optical fibers with a dual-fiber collimator. Four dualfiber collimators are vertically aligned as the inputs/outputs and the pixels of the LCOS chip are vertically allocated as four independent zones. Thus the device can act as a 4-channel TFA, which is assembled and functionally demonstrated.
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Dong Feng, Dong Feng, Zhujun Wan, Zhujun Wan, Xu Chen, Xu Chen, Shijia Yan, Shijia Yan, Zhixiang Luo, Zhixiang Luo, "An optical tunable filter array based on LCOS phase grating", Proc. SPIE 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 106170M (10 January 2018); doi: 10.1117/12.2295161; https://doi.org/10.1117/12.2295161

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