Abstract

The chief principle and properties of a novel noncascaded type optical bandpass filter with three unique general characteristics are presented. This device is based on a combination of a Michelson interferometer and a Gires-Tournois resonator (GTR). First, the filter has square-like frequency response with zero ripple, wide flat-top (0.74 bandwidth), unity contrast, sharp steepness, and infinite rejection ratio when GTR front surface mirror reflectance \rho is equal to one-third. Second, this filter possesses variable bandwidth and center-wavelength tunability features with simple control mechanism and nanosecond temporal response potential. Third, the desired features of the filter can be synthesized easily by mere inspection since only three parameters are required, and their expressions are given in simple analytic forms. Numerical results showing these features are presented and other characteristics are briefly discussed.

[IEEE ]

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Appl. Opt.

J. Lightwave Technol.

J. Minowa and Y. Fujii, "Dielectric multilayer thin-film filters for WDM transmission systems," J. Lightwave Technol., vol. 1, pp. 116-121, 1983.

N. Ngo and L. Nguyen Binh, "Novel realization of the monotonic butterworth-type lowpass, highpass, and bandpass optical filters using phase-modulated fiber-optic interferometers and ring resonators," J. Lightwave Technol., vol. 12, pp. 827-841, 1994.

A. Bakhtazad, H. Abiri, and M. Rahnavard, "Optimum bandpass optical filter synthesis using periodic corrugated waveguides with \pi/2 phase shifts," J. Lightwave Technol., vol. 13, pp. 1780-1786, 1995.

F. Bakhati and P. Sansonetti, "Design and realization of multiple quarter-wave phase shifts UV-written bandpass filters in optical fibers," J. Lightwave Technol., vol. 15, pp. 1433-1437, 1997.

G. H. Song, "Toward the ideal codirectional Bragg filter with an acousto-optic-filter design," J. Lightwave Technol., vol. 13, pp. 470-480, 1995.

M. Kajikawa and I. Kataoka, "A design method of optical bandpass filters," J. Lightwave Technol., vol. 15, pp. 1720-1727, 1993.

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

C. Madsen and J. Zhao, "A general planar waveguide autoregressive optical filter," J. Lightwave Technol., vol. 14, pp. 437-447, 1996.

Opt. Lett.

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