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Switching of BJT01:22

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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N × N polymer matrix switches using thermo-optic total-internal-reflection switch.

Young-Tak Han1, Jang-Uk Shin, Sang-Ho Park

  • 1Photonic Computer Systems Laboratory, Korea Advanced Institute of Science and Technology (KAIST), 335 Gwahangno, Yuseong-gu, Daejeon 305-701, South Korea. frenclin@etri.re.kr

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|June 21, 2012
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Summary

Researchers created advanced optical matrix switches using thermo-optic polymer switches. These non-blocking devices offer high performance with low insertion loss and fast switching times for telecommunications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Optical matrix switches are crucial for high-speed data routing in telecommunications.
  • Existing technologies face limitations in terms of size, power consumption, and performance.

Purpose of the Study:

  • To develop fully non-blocking optical matrix switches with enhanced performance.
  • To utilize thermo-optic polymer technology for compact and efficient switching elements.

Main Methods:

  • Designed a unit switching element based on a 1x2 total-internal-reflection (TIR) switch.
  • Utilized crossed multimode polymer waveguides and an offset heater electrode.
  • Fabricated 4x4 and 8x8 optical matrix switch chips.

Main Results:

  • Achieved insertion losses below 2.5 dB (4x4) and 4.5 dB (8x8).
  • Demonstrated switching isolation greater than 38 dB in the off-state.
  • Reported a switching time of approximately 3 ms and power consumption below 30 mW per element.
  • Integrated compact switch chips (25x4.25 mm for 4x4, 42.4x5 mm for 8x8).

Conclusions:

  • The developed thermo-optic polymer TIR switches enable high-performance, non-blocking optical matrix switching.
  • Optimized waveguide and heater geometries led to compact and efficient switch designs.
  • These switches are suitable for advanced optical networking applications requiring low loss and fast response.