Integrated CMOS system and thermally actuated optical switch for wavelength modulation/lock in communication network |
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Authors: | J C Liou F G Tseng |
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Institution: | 1. Nano Engineering and Micro Systems Inst., National Tsing Hua University, Hsinchu, Taiwan, ROC 2. Engineering and System Science Dept., National Tsing Hua University, Hsinchu, Taiwan, ROC 3. Division of Mechanics, Research Centre for Applied Sciences, Academia Sinica, Taipei, Taiwan, ROC
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Abstract: | The advancement of communication technology and growth of internet traffic have continuously driven the fast evolution of
networks. Compared to the traditional optoelectronic switch, all-optical switch provides high throughput, rich routing functionalities,
and excellent flexibility for rapid signal exchange in fiber optical network. Among various all-optical switches, thermal
actuated ring switch provides the advantages of high accuracy, easy actuation, and reasonable switching speed. However, when
scale up, thermal ring switch may encounter issues related to fabrication error, non-accurate wavelength response, and large
terminal numbers in the control circuit. In this research, we propose the employment of an integrated CMOS control circuit
to compensate the fabrication error and tune as well as lock the wavelength in a thermal-actuated ring-type optical switch
through a frequency modulation scheme. Additional functionalities can also be added in this circuit by tailoring externally
the roundtrip loss or coupling constants of the ring. The design concept can be easily scaled up for large array optical switch
system without much change in the terminal numbers thanks to the three-dimensional hierarchy of control circuit design, which
effectively reduces the terminal numbers into the cubic root of the total control unit numbers. The integrated circuit has
been designed, simulated, as well as fabricated, and demonstrated a decent performance with free spectral range (FSR) equal
to 1.5 nm at 1534 nm and very accurate wavelength modulation to 0.3 nm within 0.01 nm fluctuation for thermal actuated ring
type optical switch. |
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Keywords: | |
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