Abstract

The authors analyze an array of long-period waveguide gratings with coupled-mode theory and show that the grating array can provide effective power transfer among the waveguides at specific wavelengths in the absence of evanescent-field coupling. In particular, they derive the general conditions for obtaining an arbitrary distribution of power splitting ratios among the waveguides and discuss several special cases. They also present a design example using practical waveguide parameters to demonstrate the feasibility of forming such grating arrays for the realization of multiport broadband couplers and add/drop multiplexers.

© 2006 IEEE

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Appl. Opt. (1)

Appl. Phys. Lett. (1)

Q. Liu, K. S. Chiang, K. P. Lor, C. K. Chow, "Temperature sensitivity of a long-period waveguide grating in a channel waveguide," Appl. Phys. Lett. 86, 241115 (2005).

Electron. Lett. (2)

K. S. Chiang, C. K. Chow, H. P. Chan, Q. Liu, K. P. Lor, "Widely tunable polymer long-period waveguide grating with polarization-insensitive resonance wavelength," Electron. Lett. 40, 422-424 (2004).

K. S. Chiang, Y. Liu, M. N. Ng, S. Li, "Coupling between two parallel long-period fibre gratings," Electron. Lett. 36, 1408-1409 (2000).

IEEE J. Sel. Topics Quantum Electron. (1)

M.-S. Kwon, S.-Y. Shin, "Characteristics of polymer waveguide notch filters using thermooptic long-period gratings," IEEE J. Sel. Topics Quantum Electron. 11, 190-196 (2005).

IEEE Photon. Technol. Lett. (4)

M.-S. Kwon, S.-Y. Shin, "Polymer waveguide notch filter using two stacked thermooptic long-period gratings," IEEE Photon. Technol. Lett. 17, 792-794 (2005).

K. P. Lor, Q. Liu, K. S. Chiang, "UV-written long-period gratings on polymer waveguides," IEEE Photon. Technol. Lett. 17, 594-596 (2005).

K. S. Chiang, K. P. Lor, C. K. Chow, H. P. Chan, V. Rastogi, Y. M. Chu, "Widely tunable long-period gratings fabricated in polymer-clad ion-exchanged glass waveguides," IEEE Photon. Technol. Lett. 15, 1094-1096 (2003).

M. N. Ng, Z. Chen, K. S. Chiang, "Temperature compensation of long-period fiber grating for refractive-index sensing with bending effect," IEEE Photon. Technol. Lett. 14, 361-363 (2002).

J. Lightw. Technol. (4)

A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan, J. E. Sipe, "Long-period fiber gratings as band-rejection filters," J. Lightw. Technol. 14, 58-65 (1996).

K. S. Chiang, F. Y. M. Chan, M. N. Ng, "Analysis of two parallel long-period fiber gratings," J. Lightw. Technol. 22, 1358-1366 (2004).

Q. Liu, K. S. Chiang, V. Rastogi, "Analysis of corrugated long-period waveguide gratings and their polarization dependence," J. Lightw. Technol. 21, 3399-3405 (2003).

Y. K. Bai, K. S. Chiang, "Analysis and design of long-period waveguide grating couplers," J. Lightw. Technol. 23, 4363-4373 (2005).

J. Opt. Soc. Amer. A, Opt. Image Sci. (1)

D. B. Stegall, T. Erdogan, "Dispersion control with use of long-period fiber gratings," J. Opt. Soc. Amer. A, Opt. Image Sci. 17, 304-312 (2000).

Jpn. J. Appl. Phys. (1)

K. S. Chiang, K. P. Lor, Q. Liu, C. K. Chow, Y. M. Chu, H. P. Chan, "Long-period waveguide gratings," Jpn. J. Appl. Phys. 43, 5690-5696 (2004).

Microw. Opt. Technol. Lett. (1)

M. K. Pandit, K. S. Chiang, Z. H. Chen, S. P. Li, "Tunable long-period fiber gratings for EDFA gain and ASE equalization," Microw. Opt. Technol. Lett. 25, 181-184 (2000).

Opt. Exp. (1)

Q. Liu, K. S. Chiang, K. P. Lor, "Long-period gratings in polymer ridge waveguides," Opt. Exp. 13, 1150-1160 (2005).

Opt. Lett. (3)

Other (2)

K. S. Chiang, M. N. Ng, Y. Liu, S. Li, "Evanescent-field coupling between two parallel long-period fiber gratings," Proc. IEEE Lasers and Electro-Opt. Soc. Conf. (2000) pp. 836-837.

V. Grubsky, D. S. Starodubov, J. Feinberg, "Wavelength-selective coupler and add-drop multiplexer using long-period fiber gratings," Proc. Opt. Fiber Commun. Conf. Tech. Dig. (2000) pp. 28-30.

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