A Novel Wavelength Sensor Using A Structure Of Optical Directional Coupler

  • Sae-Tang, K. (Faculty of Engineering, KMITL, Chalong-Krung Rd.) ;
  • Somkuarnpanit, S. (Faculty of Engineering, KMITL, Chalong-Krung Rd.) ;
  • Khuntaweetep, S. (Faculty of Engineering, KMITL, Chalong-Krung Rd.)
  • 발행 : 2002.07.01

초록

This paper proposes a wavelength sensor based on the optical directional coupler. The finite-difference time-domain (FDTD) is used in analysis of the field intensity of tile light propagating thorough the structure. The device with tile width of 0.4 $\mu\textrm{m}$ and the thickness of 0.4 $\mu\textrm{m}$, which corresponding with the coupling length of 40$\mu\textrm{m}$, would provide tile linear relationship between the coupling efficiency against the wavelength. The device can sense the wavelength in a range between 1.5$\mu\textrm{m}$ and 1.6$\mu\textrm{m}$, with continuous resolution. The wide wavelength could be also done be paralleling th light to a number of wavelength-sensing modules with particularly required bands. Therefore, it could be employed as the wavelength sensing for most optical communications, optoelectronics, laser applications and etc.

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