Abstract

Thin film (TF)-based coupled cavity all-pass filters (CCAP) have the potential for providing compact, low-loss, and highly stable third-order dispersion (TOD) compensation in ultrafast optical fiber transmission systems employing optical time-division multiplexing (OTDM). In this paper, a methodology for designing CCAP filters for TOD compensation is presented. First, we develop a theory necessary for designing the cavity structure, that is, mirror reflectivity and cavity spacing, of CCAP filters. As a next step, we discuss how we can represent such filters as TF devices and demonstrate several TF-layer design examples. Finally, a coupled two-cavity filter is constructed and tested. The filter has a center wavelength that can be varied over a range of 8 nm and can compensate for fiber TOD between 2.0 and 15.5 ps3 over a bandwidth between 3.6 and 1.2 nm, respectively. The peak spectral ripple of the filter is 1.0 dB. The experimentally measured dispersion curves of the filter agree well with the theory.

[IEEE ]

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  1. K. Takiguchi, S. Kawanishi, H. Takara, A. Hiimeno and K. Hattori, "Dispersion slope equalizer for dispersion shifted fiber using a lattice-form programmable optical filter on a planar lightwave circuit", J. Lightwave Technol., vol. 16, pp. 1647-1656, Sept. 1998.
  2. G. Lenz and C. Madsen, "General optical all-pass filter structures for dispersion control in WDM systems", J. Lightwave Technol., vol. 17, pp. 1248-1254, July 1999.
  3. E. Dowling and D. MacFarlane, "Lightwave lattice filters for optically multiplexed communication systems", J. Lightwave Technol., vol. 12, pp. 471-486, Mar. 1994.
  4. S. Ryu, Y. Horiuchi and K. Mochizuki, "Novel chromatic dispersion measurement method over continuous gigahertz tuning range", J. Lightwave Technol., vol. 7, pp. 1177-1180, Aug. 1989.

J. Lightwave Technol.

K. Takiguchi, S. Kawanishi, H. Takara, A. Hiimeno and K. Hattori, "Dispersion slope equalizer for dispersion shifted fiber using a lattice-form programmable optical filter on a planar lightwave circuit", J. Lightwave Technol., vol. 16, pp. 1647-1656, Sept. 1998.

G. Lenz and C. Madsen, "General optical all-pass filter structures for dispersion control in WDM systems", J. Lightwave Technol., vol. 17, pp. 1248-1254, July 1999.

E. Dowling and D. MacFarlane, "Lightwave lattice filters for optically multiplexed communication systems", J. Lightwave Technol., vol. 12, pp. 471-486, Mar. 1994.

S. Ryu, Y. Horiuchi and K. Mochizuki, "Novel chromatic dispersion measurement method over continuous gigahertz tuning range", J. Lightwave Technol., vol. 7, pp. 1177-1180, Aug. 1989.

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