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Browsing by Author "Lan, Yu-Ping"

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    Liquid crystal enabled multi-channel power equalizer and stabilizer
    (2007-10-15)
    Pan, Ru-Pin
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    Sheu, Chia-Rong
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    Lan, Yu-Ping
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    Lai, Yi-Fan
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    Pan, Ci-Ling
    Automatic power equalization and stabilization of a liquid crystal enabled channel-selectable optical demultiplexer is demonstrated. The variation among output signals from different channels was reduced from similar to 10 dB to 0.15 dB with feedback control. The minimum ripple level of a single channel is similar to 0.05 dB. As a variable optical attenuator (VOA), the attenuation range of the device is similar to 12.6 dB. (c) 2007 Elsevier B.V. All rights reserved.
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    Multi-wavelength external-cavity laser with digital and mode-hope-free fine tuning mechanisms
    (2005-03-10)
    Pan, Ci-Ling
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    Chao, Ru-Pin
    ;
    Lan, Yu-Ping
    An apparatus for electronically tuning of a single or multi-wavelength external-cavity laser, comprising: an AR-coated diode laser, a collimator, a liquid crystal cell, a dispersion grating, a focusing lens and a liquid crystal pixel mirror. Wavelength channels can be selected by opening the appropriate pixels of the liquid crystal pixel mirror. By turning on several pixels at the same time, the laser can generate output at several wavelengths. Wavelength switching between channels is also possible. Laser wavelength can further be tuned by varying the driving voltages of the liquid crystal cell or the appropriate pixel mirror. The liquid crystal cell and the liquid crystal pixel mirror in the laser cavity can be combined to form a sandwich-type liquid crystal pixel mirror that allows both step (digital) or fine tuning of the laser wavelength.