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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 31, Iss. 13 — Jul. 1, 2013
  • pp: 2086–2098

Photonic Transistor Design Principles for Switching Gain >=2

Vivek Krishnamurthy, Yijing Chen, and Seng-Tiong Ho

Journal of Lightwave Technology, Vol. 31, Issue 13, pp. 2086-2098 (2013)

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A novel two-staged photonic transistor with high operating speed, low switching power and high switching gain was recently proposed. Based on the manipulation of optical interference in an active directional coupler by optically controlled absorption and gain, two complementary device types were conceptually evaluated through the use of time domain technique showing ~105 times higher figure of merit compared to conventional approaches. With the joint usage of both device types, the photonic transistor could function as wavelength converter, pulse regenerator and logical operator. In this work, we identify the operational regimes of the photonic transistor that helps in reducing the footprint and operating intensities to achieve a switching gain of at least ~2 (or 3 dB). A recently proposed theoretical framework that calculates the spatial profiles of optical fields and complex permittivities seen by them in photonic structures with multiple active and passive sections is utilized for the purposes. We show that the operational intensity and wavelengths of interacting fields in the photonic transistor must be such that ɑ00 L1>=26 and g0L2 >= 3.2 to achieve a switchinggain >=2, where ɑ0=absorption coefficient of the short wavelength, g0= pumped medium gain coefficient seen by long wavelength beams, L1 = length of first stage and L2= length of second stage .

© 2013 IEEE

Vivek Krishnamurthy, Yijing Chen, and Seng-Tiong Ho, "Photonic Transistor Design Principles for Switching Gain >=2," J. Lightwave Technol. 31, 2086-2098 (2013)

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