Abstract

An improved design and fabrication method of nonlinearly chirped fiber Bragg gratings is demonstrated. Based on reconstruction-equivalent-chirp method, the nonlinearly chirped fiber Bragg grating is realized with a linearly chirped phase mask instead of a uniform one, which improves the performance of the device. Coated with uniform thin metal film, the obtained grating works as a tunable dispersion compensator with a tuning range ~200ps/nm, peak-to-peak group delay ripple <14ps and 3-dB bandwidth≈2nm Employing this device, the power penalty in a 40-Gb/s × 5/10km conventional single mode fiber using carrier suppressed return-to-zero format is less than 0.7dB at a BER=10-10.

© 2006 Optical Society of America

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References

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IEEE J. Quantum Electron. (1)

Kim A. Winick, and Jose E. Roman, "Design of corrugated waveguide filters by Fourier-Transform techniques," IEEE J. Quantum Electron. 26, 1918-1929 (1990).
[CrossRef]

IEEE Photonics Technol. Lett. (5)

C. K. Madsen, G. Lenz, A. J. Bruce, M. A. Cappuzzo, L. T. Gomez, and R. E. Scotti, "Integrated all-pass filters for tunable dispersion and dispersion slope compensation," IEEE Photonics Technol. Lett. 11, 1623-1625(1999).
[CrossRef]

Thomas Duthel, Michael Otto, and Christian G. Schäffer, "Simple tunable all-fiber delay line filter for dispersion compensation," IEEE Photonics Technol. Lett. 16, 2287-2289 (2004).
[CrossRef]

T. N. Nielsen, B. J. Eggleton, J. A. Rogers, P. S. Westbrook, P. B. Hansen, and T. A. Strasser, "Dynamic post dispersion optimization at 40Gb/s using a tunable fiber Bragg grating," IEEE Photonics Technol. Lett. 12, 173-175 (2000).
[CrossRef]

K.-M. Feng, J.-X. Cai, V. Grubsky, D. S. Starodubov, M. I. Hayee, S. Lee, X. Jiang, A. E. Willner and J. Feinberg, "Dynamic dispersion compensation in a 10-Gb/s optical system using a novel voltage tuned nonlinearly chirped fiber Bragg grating," IEEE Photonics Technol. Lett. 11, 373-375 (1999).
[CrossRef]

Xiang-fei Chen, Yi Luo, Chong-cheng Fan, Tong Wu, and Shi-zhong Xie, "Analytical expression of sampled Bragg gratings with chirp in the sampling period and its application in dispersion management design in a WDM system," IEEE Photonics Technol. Lett. 12, 1013-1015 (2000).
[CrossRef]

J. Lightwave Technol. (2)

Opt. Express (1)

Opt. Fiber Commun. Conf. (2)

Benjamin J. Eggleton, "Dynamic dispersion compensation devices for high speed transmission systems," in Proc. Opt. Fiber Commun. Conf. (Optical Society of America, Washington, D.C., 2001), WH1, pp. 1-3.

Yitang Dai, Xiangfei Chen, Yu Yao, Dianjie Jiang, and Shizhong Xie, "Correction of the repeatable errors in the fabrication of sampled Bragg gratings," in Proc. Opt. Fiber Commun. Conf. (Optical Society of America, Washington, D.C., 2005), OME20, pp. 1-3

Opt. Lett. (1)

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Figures (5)

Fig. 1.
Fig. 1.

Calculated results of a NLCFBG utilizing a uniform phase mask: (a) apodization profile and sampling period distribution along the grating length, (b) reflection spectrum and group delay curve.

Fig. 2.
Fig. 2.

Calculated results of a NLCFBG utilizing a linearly chirped phase mask: (a) apodization profile and sampling period distribution along the grating length, (b) reflection spectrum and group delay curve.

Fig. 3.
Fig. 3.

Experimental results of the NLCFBG made with a linearly chirped phase mask: (a) reflection profile and group delay curve, (b) group delay ripple across the passband.

Fig. 4.
Fig. 4.

Tuning characteristics of the TDC: Impact of heating current I on (a) reflection profile, (b) group delay curve (inset: dispersion at 1554.1nm vs. Heating current I), (c) and (d) group delay ripple.

Fig. 5.
Fig. 5.

Experiment in a 40-Gb/s system for the TDC evaluation: (a) schematic of the 40-Gb/s experimental setup. BERT=BER Tester, TDC=Tunable Dispersion Compensator, VOA=Variable Optical Attenuator, (b) performance of the TDC in 40-Gb/s optical transmission system

Equations (6)

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Δ n ( z ) = A ( z ) exp [ j φ ( z ) ] exp ( j 2 π z Λ 0 ) + c . c .
z k = P [ k + φ ( z k ) 2 π ] , P k = z k + 1 z k
Δ λ = λ 0 2 2 nP
0 < P < P max = λ 0 2 2 n 1.5 B
z k = kP + P [ φ ( z k ) Δ φ ( z k ) ] 2 π
Δ φ ( z k ) = π C z k 2 Λ 0 2

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