Abstract

This paper describes the demonstration of a simple all-optical data format conversion scheme between return-to-zero (RZ) and nonreturn-to-zero (NRZ) that employs a semiconductor optical amplifier (SOA) in a nonlinear optical loop mirror. The format conversion has been performed between the most widely used data formats-NRZ and RZ formats. The format conversion scheme is based on gain variation by an intensity-dependent phase change in an SOA-loop mirror. The input data stream acts as a control signal that induces the phase differences between clockwise-and counterclockwise-propagating data inside an SOA-loop mirror. It is possible to change the data format of the output data stream by controlling the phase differences of the clockwise and counterclockwise pulse in an SOA-loop mirror appropriately. For the converted NRZ data from RZ data, 10-Gb/s error-free transmission up to 78 km over standard single-mode fiber has been obtained. By comparing the conventional NRZ transmission with the Mach-Zehnder modulation scheme, the proposed RZ-to-NRZ conversion shows an improved transmission performance. The NRZ-to-RZ conversion has clear eye openings up to 78 km. On the contrary, the conventional RZ binary data from a mode-locked laser has a nearly closed eye even at 52 km. The converted RZ data has a 2-dB conversion power margin to the injected NRZ data, which indicates an increase in the receiver sensitivity due to the signal format conversion. The improved transmission distance of the converted RZ signal is due to the duobinary coding effect of the SOA-loop mirror. The SOA has the possibility of high-speed operation over 40 Gb/s, and the SOA-loop mirror has the capabilities of format and wavelength conversions. Therefore, the SOA-loop mirror can be a universal building block in future all-optical networks. In addition, the proposed format conversion scheme can serve as an important format converter between the ultrafast optical-time-division-multiplexed networks and the lower line-rate wavelength-division-multiplexed networks.

© 2005 IEEE

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  3. D. Norte and A. E. Willner, "Demonstration of an all-optical data format transparent WDM-to-TDM network node with extinction ratio enhancement for reconfigurable WDM networks", IEEE Photon. Technol. Lett., vol. 8, no. 5, pp. 715-717, May 1996.
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Opt. Lett. (1)

Other (24)

R. J. Manning and G. Sherlock, "Recovery of pi phase shift in 12.5 ps in a semiconductor laser amplifier", Electron. Lett., vol. 34, pp. 307-308, 1995.

H. J. Lee and C. S. Park, "Novel all-optical edge detector for the clock component extraction of NRZ signal using an SOA-loop-mirror", Opt. Commun. , vol. 181, pp. 323-326, 2000.

D. Norte, E. Park and A. E. Willner, "All-optical TDM-to-WDM data format conversion in a dynamically reconfigurable WDM network", IEEE Photon. Technol. Lett., vol. 7, no. 8, pp. 920-922, Aug. 1995.

D. Norte and A. E. Willner, "Experimental demonstrations of all-optical conversion betwen RZ and NRZ data formats incorporating noninverting wavelength shifting leading to format transparency", IEEE Photon. Technol. Lett., vol. 8, no. 5, pp. 712-714, May 1996.

D. Norte and A. E. Willner, "Demonstration of an all-optical data format transparent WDM-to-TDM network node with extinction ratio enhancement for reconfigurable WDM networks", IEEE Photon. Technol. Lett., vol. 8, no. 5, pp. 715-717, May 1996.

D. Norte and A. E. Willner, "All-optical data format conversions and reconversions between the wavelength and time domains for dynamically reconfigurable WDM networks", J. Lightw. Technol., vol. 14, no. 6, pp. 1170-1182, Jun. 1996.

P. S. Cho, D. Mahgerefteh, J. Goldhar, L. G. Joneckis and G. L. Burdge, "High-performance noninterferometric semiconductor-optical-amplifier/fiber-Bragg-grating wavelength converter", Electron. Lett., vol. 34, pp. 371-373, 1998.

J. P. Sokoloff, P. R. Prucnal, I. Glesk and M. Kane, "A terahertz optical asymmetric demultiplexer (TOAD)", IEEE Photon. Technol. Lett., vol. 5, no. 7, pp. 787 -790, Jul. 1993.

M. Eiselt, W. Pieper and H. G. Weber, "SLALOM: Semiconductor laser amplifier in a loop mirror", J. Lightw. Technol., vol. 13, no. 10, pp. 2099-2112, Oct. 1995.

B. C. Wang, L. Xu, W. Baby, D. Zhou, R. J. Runser, I. Glesk and P. R. Prucnal, "Experimental study on the regeneration capability of the terahertz optical asymmetric demultiplexer", Opt. Commun., vol. 199, pp. 83-88, 2001.

S. Diez, E. Hilliger, M. Kroch, C. Schmidt, C. Shubert, H. G. Weber, L. Occhi, L. Schares, G. Guekos and L. K. Oxenloewe, "Optimization of SOA-based Sagnac-interferometer switches for demultiplexing to 10 and 40 gb/s", Opt. Commun., vol. 189, pp. 241-249, 2001.

L. Xu, B. C. Wang, V. Baby, I. Glesk and P. R. Prucnal, "Performance-improved all-optical RZ to NRZ format conversion using duplicator and wavelength convertor", Opt. Commun. , vol. 206, pp. 77-80, 2002.

P. S. Cho, D. Mahgerefteh and J. Goldhar, "10 Gb/s RZ to NRZ format conversion using a semiconductor-optical-amplifier/fiber-Bragg-grating wavelength converter", in Proc. Eur. Conf. Optical Communication (ECOC 1998), Madrid, Spain, 1998, pp. 353-354.

H. J. Lee, S. J. B. Yoo and C.-S. Park, "Novel all-optical 10 Gbp/s RZ-to-NRZ conversion using SOA-loop-mirror", presented at the Optical Fiber Communication Conf. (OFC 2001), Anaheim, CA, Mar. 17-22, 2001.

H. J. Lee, K. Kim, J. Y. Choi, H. G. Kim and C. H. Yim, "All-optical NRZ-to-inverted-RZ converter with extinction ratio enhancement using a modified terahertz optical asymmetric demultiplexer", IEICE Trans. Commun., vol. E82-B, pp. 387-389, 1999.

S. G. Park, L. H. Spiekman, M. Eiselt and J. M. Wiesenfeld, "Chirp consequence of all-optical RZ to NRZ conversion using cross-phase modulation in an active semiconductor photonic integrated circuit", IEEE Photon. Technol. Lett., vol. 12, no. 3, pp. 233-235, Mar. 2000.

L. Xu, V. Baby, I. Glesk and P. R. Prucnal, "All-optical data format conversion between RZ and NRZ based on a Mach-Zehnder interferometric wavelength converter", IEEE Photon. Technol. Lett., vol. 15, no. 2, pp. 308 -310, Feb. 2003.

C. W. Chow, C. S. Wong and H. K. Tsang, "All-optical NRZ to RZ format and wavelength converter by dual-wavelength injection locking", Opt. Commun., vol. 209, pp. 329-334, 2002.

B. Mikkelsen, M. Vaa, H. N. Poulsen, S. L. Danielsen, C. Joergensen, A. Kloch, P. B. Hansen, K. E. Stubkjaer, K. Wunstel, K. Daub, E. Lach, G. Laube, W. Idler, M. Schilling and S. Bouchoule, "40 Gb/s all-optical wavelength converter and RZ-to-NRZ format adapter realized by monolithic integrated active Michelson interferometer", Electron. Lett., vol. 33, pp. 133-134, 1997.

H. K. Lee, K. H. Kim, J. T. Ahn, M. Y. Jeon and E. H. Lee, "All-optical format conversion from NRZ to RZ signals using a walk-off balanced nonlinear fiber loop mirror", Electron. Lett., vol. 32, pp. 2335-2336, 1996.

S. Bigo, E. Desurvire and B. Desruelle, "All-optical RZ to NRZ format conversion at 10 Gbit/s with nonlinear optical loop mirror", Electron. Lett., vol. 30, pp. 1868-1869, 1994.

R. J. Manning, A. D. Ellis, A. J. Poustie and K. J. Blow, "Semiconductor laser amplifiers for ultrafast all-optical signal processing", J. Opt. Soc. Amer. B, vol. 11, pp. 3204-3216, 1997.

K. S. Cheng and J. Conradi, "Reduction of pulse-to-pulse interaction using alternative RZ formats in 40-Gb/s systems", IEEE Photon. Technol. Lett., vol. 14, no. 1, pp. 98-100, Jan. 2002.

J. Yu, "Generation of modified duobinary RZ signals by using one single dual-arm LiNbO3 modulator", IEEE Photon. Technol. Lett., vol. 15, no. 10, pp. 1455 -1457, Oct. 2003.

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