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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 13 — Jun. 23, 2008
  • pp: 9459–9467

Strategies for realizing photonic crystal fiber bandpass filters

S. K. Varshney, K. Saitoh, N. Saitoh, Y. Tsuchida, M. Koshiba, and R. K. Sinha  »View Author Affiliations

Optics Express, Vol. 16, Issue 13, pp. 9459-9467 (2008)

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Numerical design strategies are presented to achieve efficient broad or narrow band-pass filters based on index-guiding, solid-core, and single-mode photonic crystal fibers (PCFs). The filtering characteristics have been verified through BPM solver. By scaling the pitch constant, the bandpass window can be shifted accordingly. The fiber design constitutes a fluorine-doped central core, enlarged air-holes surrounding the down-doped core, and small air-holes in the cladding. The proposed bandpass filter is based on controlling the leakage losses, so one can tune filter characteristics simply by changing its length. From numerical simulations we show that for large values of air-hole diameter in the first ring, the bandpass window is narrow, while for low doping concentration and small sized air-holes in the first ring, bandpass window is very broad. We also simulate how the hole-size and number of rings in the PCF cladding affects the device characteristics. We find that a 5-cm long PCF with down-doped core and eleven rings of air-holes can result in ~440 nm 3-dB bandwidth with more than 90% of transmission. The longer device has reduced transmission and smaller 3-dB bandwidth. Tolerance analysis has also been performed to check the impact of fiber tolerances on the performance of the PCF bandpass filter. It has been observed that the decrement in cladding holediameter by 1% reduces the transmission to 21% from its peak value of 93%, however ±1% tolerance in the inner hole-diameter degrades the transmission to 75% from its peak.

© 2008 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2400) Fiber optics and optical communications : Fiber properties
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:
Photonic Crystal Fibers

Original Manuscript: May 30, 2008
Manuscript Accepted: June 3, 2008
Published: June 11, 2008

S. K. Varshney, K. Saitoh, N. Saitoh, Y. Tsuchida, M. Koshiba, and R. K. Sinha, "Strategies for realizing photonic crystal fiber bandpass filters," Opt. Express 16, 9459-9467 (2008)

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