• Title/Summary/Keyword: digital optical switch (DOS)

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Polymer $1{\times}2$ Thermo-Optic Digital Optical Switch Based on the Total-Internal-Reflection Effect

  • Han, Young-Tak;Shin, Jang-Uk;Park, Sang-Ho;Han, Sang-Pil;Baek, Yong-Soon;Lee, Chul-Hee;Noh, Young-Ouk;Park, Hyo-Hoon
    • ETRI Journal
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    • v.33 no.2
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    • pp.275-278
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    • 2011
  • This letter presents a polymer $1{\times}2$ thermo-optic totalinternal-reflection digital optical switch (TIR-DOS) with an index contrast of 1.5%-${\delta}$ operating at low power consumption. The structure of our $1{\times}2$ TIR-DOS was created by adding a reflection port to that of a conventional multimode filtering variable optical attenuator. To improve the total-internalr-eflection efficiency, a heater offset was applied to the crossing region of multimode waveguides of the TIR-DOS. The fabricated $1{\times}2$ TIR-DOS shows a low electrical power consumption of 18 mW for an on-off ratio of 35 dB.

Crosstalk-Enhanced DOS Integrated with Modified Radiation-Type Attenuators

  • Han, Young-Tak;Shin, Jang-Uk;Park, Sang-Ho;Han, Sang-Pil;Lee, Chul-Hee;Noh, Young-Ouk;Lee, Hyung-Jong;Baek, Yong-Soon
    • ETRI Journal
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    • v.30 no.5
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    • pp.744-746
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    • 2008
  • This letter presents a crosstalk-enhanced polymer thermo-optic digital optical switch operating at a low power consumption. Modified radiation-type attenuators are integrated in a series with a conventional $1{\times}2$ digital optical switch. A low optical crosstalk of less than -45 dB is attained at a low applied switching power of 60 mW, and an insertion loss of about 1.1 dB is exhibited.

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High Performance Polymeric Optical Waveguide Devices (고성능 폴리머 광도파로 소자)

  • O, Min-Cheol;No, Yeong-Uk;Lee, Hyeong-Jong
    • Proceedings of the Optical Society of Korea Conference
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    • 2005.02a
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    • pp.292-295
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    • 2005
  • Variable optical attenuators (VOA) made of low-loss fluorinated polymers are demonstrated which shows a low operating power less than 30 mW due to the superior thermo-optic effect of polymer material and a low insertion loss less than 1.0 dB by incorporating highly fluorinated polymers to reduce the absorption loss at 1550 nm. An attenuator-integrated low-crosstalk polymeric digital optical switch (DOS) is also demonstrated. The switch and attenuator shares a single connected electrode which is controlled by a single current source. Due to the simple structure of the integrated attenuator, the device length is reduced to 1 cm so as to provide low insertion loss of 0.8 and 1.1 dB for 1300 and 1550 nm, respectively. The attenuator radiates remained optical signal on the switch-off branch in order to decrease the switching crosstalk to be less than -70 dB with an applied electrical power of 200 mW.

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Reconfigurable Optical Add-Drop Multiplexer Using a Polymer Integrated Photonic Lightwave Circuit

  • Shin, Jang-Uk;Han, Young-Tak;Han, Sang-Pil;Park, Sang-Ho;Baek, Yong-Soon;Noh, Young-Ouk;Park, Kang-Hee
    • ETRI Journal
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    • v.31 no.6
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    • pp.770-777
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    • 2009
  • We have developed a fully functional reconfigurable optical add-drop multiplexer (ROADM) switch module using a polymer integrated photonic lightwave circuit technology. The polymer variable optical attenuator (VOA) array and digital optical switch array are integrated into one polymer PLC chip and packaged to form a 10-channel VOA integrated optical switch module. Four of these optical switch modules are used in the ROADM switch module to execute 40-channel switching and power equalization. As a wavelength division multiplexer (WDM) filter device, two C-band 40-channel athermal arrayed waveguide grating WDMs are used in the ROADM module. Optical power monitoring of each channel is carried out using a 5% tap PD. A controller and firmware having the functions of a 40-channel switch and VOA control, optical power monitoring, as well as TEC temperature control, and data communication interfaces are also developed in this study.