Abstract

A new filtering technique is proposed that associates the high dispersion of standard reflection gratings with the tuning speed of acousto-optic cells. Tuning is performed by adjusting the grating period so that the chosen wavelength is at Bragg resonance. In this way, the selected wavelength always experiences a maximum diffraction efficiency, ensuring good uniformity. Using a commercial acousto-optic modulator, a wavelength selectivity of 0.075 nm is demonstrated together with a uniformity of ±0.2 dB on a tuning range of 2.2 nm corresponding to N = 30 resolvable frequencies. N > 600 could be obtained with an acousto-optic cell specially designed for this device.

© 2005 Optical Society of America

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References

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    [CrossRef]
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International Conference on Modeling and (1)

J-S. Moon and A. Shkel, �??Performance Limits of a Micromachined Tunable-Cavity Filter,�?? Technical Proceedings of the 2001 International Conference on Modeling and Simulation of Microsystems 1, 278-281 (2001)

J. Lightwave Technol. (1)

Y. Fujii, �??High-isolation polarization-independent optical circulator coupled with single-mode fibers,�?? J. Lightwave Technol., 19, 1238-1243 (1991)
[CrossRef]

J. Opt. Soc. Am. B (1)

Journal of Lightwave Technology (1)

D.A. Smith, R.S. Chakravarthy, Z. Bao, J.E. Baran, J.L. Jackel, A. d�??Alessandro, D.J. Fritz, S.H. Huang, X.Y. Zou, S.M. Hwang, A.E.Willner and K.D. Li, �??Evolution of the acousto-optic wavelength routing switch,�?? Journal of Lightwave Technology 14, 1005-1019 (1996)
[CrossRef]

Opt. Eng. (1)

J. Paul, L.P. Zhao, B.K.A. Ngoi and Z.P. Fang, �??Novel Configuration for Lateral Pressure Tuning of Fiber Bragg Grating without Peak Splitting,�?? Opt. Eng. 43, 2208-2209 (2004)
[CrossRef]

Opt. Lett. (2)

Sol. State Elec. (1)

W. M. Duncan, T. Bartlett, B. Lee, D. Powell, P. Rancuret and B. Sawyers, �??Dynamic optical filtering in DWDM systems using the DMD,�?? Sol. State Elec. 46, 1583-1585 (2002).
[CrossRef]

TOPS (1)

J. D. Berger, F. Ilkov, D. King, A. Tselikov, and D. Anthon, �??Widely tunable, narrow optical bandpass Gaussian filter using a silicon microactuator,�?? in Optical Fiber Communication Conference (OFC), Postconference Digest, Vol. 86 of 2003 OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2003), pp. 252-253.

Other (2)

P. K. Das, Casimer M. Decusatis, Acousto-Optic Signal Processing Fundamentals and Applications, (Artech House, 1991).

A. Rahman, �??A Review of DWDM,�?? <a href="http://home.comcast.net/�?dwdm2/DWDM Review.PDF">http://home.comcast.net/�?dwdm2/DWDM Review.PDF</a>

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Figures (5)

Fig. 1.
Fig. 1.

Filtering principle: schematic view of the whole device

Fig. 2.
Fig. 2.

The tuning principle: (a) Diffraction efficiency of the AO cell, versus incidence angle, when it is tuned to the angle θ 1. Depending on their incidence, the beams of different wavelengths experience full diffraction (θ 1) partial diffraction and partial reflection (θ 2) or no diffraction and full reflection (θ 3). (b) Beams wavevectors (modulus 2π/λ) of the Bragg incident beam at λ 1 and the θ 2 incident beam at λ 2 and the corresponding diffracted (D), reflected (R) and reflected diffracted or diffracted reflected (RD=DR) beams. K is the AO grating wavevector .(c) AO cell, when it is tuned to θ 1 (period Λ = λ 1/2sinθ 1), with its back mirror

Fig. 3.
Fig. 3.

70° incidence on the diffraction grating. a) diffraction efficiency as a function of acoustic frequency for 5 optical wavelengths ranging from 759.73 to 760.77 nm. b) optical spectrum for an acoustic frequency of 110 MHz.

Fig. 4.
Fig. 4.

85° incidence on the diffraction grating. a) diffraction efficiency as a function of acoustic frequency for 5 optical wavelength ranging from 759.73 to 760.77 nm. b) optical spectrum for an acoustic frequency of 110 MHz.

Fig. 5.
Fig. 5.

85° incidence on the diffraction grating with a prism. a) setup. b) optical spectrum for an acoustic frequency of 110 MHz

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