Abstract

Significant uncompensated reach extension of highly chirped 10-Gbit∕s directly modulated lasers is demonstrated by use of optical filtering provided by optical demultiplexers at the link end. Narrowband filtering narrows the optical spectrum of the chirped signal to minimize dispersion effects when the filter's center wavelength is appropriately adjusted relative to the laser wavelength. We show that an equivalent reach improvement is obtained with a dense wavelength division multiplexing (DWDM) demultiplexer as the filtering agent with optimal filter-laser alignment. Experimental uncompensated reach lengths of greater than 100 km of Corning LEAF® fiber are demonstrated, without the need for forward error correction. This represents a reach improvement of up to 50% in comparison with nominally unfiltered signal transmission. We also examine the correlation of performance with the filter insertion loss derivative.

© 2005 Optical Society of America

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Appl. Opt.

CLEO, IQEC and PhAST Technical Digest

L.-S. Yan, Y. Wang, B. Zhang, C. Yu, J. McGeehan, L. Paraschis, and A. E. Willner, "Reach extension in 10-Gb∕s directly modulated systems using narrow-band partial optical filtering," CLEO∕IQEC and PhAST Technical Digest on CD-ROM (Optical Society of America, Washington, D.C., 2004), paper CWA18.

ECOC 2004

L.-S. Yan, Y. Wang, B. Zhang, C. Yu, J. McGeehan, L. Paraschis, and A. E. Willner, "1400-km transmission using a single directly modulated DFB laser and optical sideband filtering in an 8×10-Gb∕s WDM system," in 30th European Conference on Optical Communications (ECOC 2004) (IEEE, Piscataway, N.J., 2004), paper Mo.4.5.7.

Electron. Lett.

P. A. Morton, G. E. Shtengel, L. D. Tzeng, R. D. Yadvish, T. Tanbun-Ek, and R. A. Logan, "38.5 km error free transmission at 10 Gbit∕s in standard fibre using a low chirp, spectrally filtered, directly modulated 1.55 μm DFB laser," Electron. Lett. 33, 310-311 (1997).

IEEE Photon. Tech. Lett.

N. S. Bergano, F. W. Kerfoot, and C. R. Davidson, "Margin measurements in optical amplifier systems," IEEE Photon. Tech. Lett. 5, 304-306 (1993).

I. Tomkos, B. Hallock, I. Roudas, R. Hesse, A. Boskovic, J. Nakano, and R. Vodhanel, "10-Gb∕s transmission of 1.55-μm directly modulated signal over 100 km of negative-dispersion fiber," IEEE Photon. Tech. Lett. 13, 735-737, (2001).

IEEE Photonic Tech. Lett.

M. D. Feuer, S.-Y. Huang, S. L. Woodward, O. Coskun, and M. Boroditsky, "Electronic dispersion compensation for a 10-Gb∕s link using a directly modulated laser," IEEE Photonic Tech. Lett. 15, 1788-1790 (2003).

LEOS 2001

A. Filios, B. Hallock, T. Kennedy, I. Tomkos, M. Vodhanel, and R. Vodhanel, "16 channel, 10 Gb∕s DWDM transmission of directly modulated lasers with 100 GHz channel spacing over 100 km of negative-dispersion fiber," Proceedings of the Lasers and Electro-Optics Society 2001 Annual Meeting (IEEE, Piscataway, N.J., 2001), Vol. 2, pp. 742-743.

OFC 2004

H. S. Chung, Y. G. Jang, and Y. C. Chung, "Directly modulated CWDM∕DWDM system using negative-dispersion fiber for metro network application," in Optical Fiber Communication Conference on CD-ROM (Optical Society of America, Washington, D.C., 2004), paper WG5.

T. Okuno, H. Hatayama, T. Sasaki, K. Soma, A. Moto, Y. Hirano, M. Onishi, and M. Shigematsu, "Negative dispersion-flattened fiber for full-spectrum signal transmission in metropolitan networks," in Optical Fiber Communication Conference on CD-ROM (Optical Society of America, Washington, D.C., 2004), paper TuB7.

C. R. S. Fludger, J. E. A. Whiteaway, and P. J. Anslow, "Electronic equalization for low cost 10 Gbit∕s directly modulated systems," in Optical Fiber Communication Conference on CD-ROM (Optical Society of America, Washington, D.C., 2004), paper WM7.

P. J. Winzer, F. Fidler, M. J. Matthews, L. E. Nelson, S. Chandrasekhar, L. L. Buhl, M. Winter, and D. Castagnozzi, "Electronic equalization and FEC enable bidirectional CWDM capacities of 9.6 Tb∕s-km," in Optical Fiber Communication Conference on CD-ROM (Optical Society of America, Washington, D.C., 2004), paper PDP7.

Proc. SPIE

J. D. Downie, F. Annunziata, A. Filios, T. Kennedy, D. Kim, and S. Oh, "Large effective area non-zero dispersion shifted fiber in metro/provincial network environments," in Optical Fibers and Passive Components, S. Shen, S. Jian, K. Okamoto, and K. L. Walker, Proc. SPIE 52791-13 (2004).

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