Abstract

We show that the symmetry properties of the two outputs from a push–pull Mach–Zehnder modulator can be exploited to reject dispersion-induced second-order distortions in the time-stretch analog-to-digital converter (TS-ADC). Using differential operation and signal processing in the digital domain, we experimentally demonstrate suppression of the signal harmonics generated due to system nonlinearities. Simulations predict that distortion-limited dynamic range improves from 34 to 57 dB. In addition, differential signaling improves the signal-to-noise ratio (SNR) by 3 dB and rejects an even-order nonlinear distortion added by an electronic digitizer in the TS-ADC. It is also shown that this approach is robust even in the presence of mismatches in the differential signal paths. In general, the approach can also be applied to any ultrawideband (multioctave) optical link to obtain a high dynamic-range system.

© 2007 IEEE

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  1. W. I. Way, Broadband Hybrid Fiber Coax Access System Technologies (Academic, 1998).
  2. G. K. Gopalakrishnan, T. J. Brophy, C. Breverman, "Experimental study of fibre induced distortions in externally modulated 1550 nm analogue CATV links," Electron. Lett. 32, 1309-1310 (1996).
  3. Y. Han, B. Jalali, "Photonic time-stretched analog-to-digital converter: Fundamental concepts and practical considerations," J. Lightw. Technol. 21, 3085-3103 (2003).
  4. S. Dubovitsky, W. H. Steier, S. Yegnanarayanan, B. Jalali, "Analysis and improvement of Mach–Zehnder modulator linearity performance for chirped and tunable optical carriers," J. Lightw. Technol. 20, 886-891 (2002).
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  8. P. W. Juodawlkis, J. C. Twichell, G. E. Betts, J. J. Hargreaves, R. D. Younger, J. L. Wasserman, F. J. O'Donnell, K. G. Ray, R. C. Williamson, "Optically sampled analog-to-digital converters," IEEE Trans. Microw. Theory Tech. 49, 1840-1853 (2001).
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  11. B. Jalali, F. Coppinger, Data conversion using time manipulation U.S. Patent 6 288 659 (2001).
  12. D. Piehler, X. Zou, C. Y. Kuo, A. Nilsson, J. Kleefeld, G. Garcia, J. D. Ralston, A. Mathur, "55 dB CNR over 50 km of fiber in an 80-channel externally-modulated AM-CATV system without optical amplification," Electron. Lett. 33, 226-227 (1997).
  13. R. Sadhwani, B. Jalali, "Adaptive CMOS predistortion linearizer for fiber-optic links," J. Lightw. Technol. 21, 3180-3193 (2003).

2007 (1)

2003 (2)

Y. Han, B. Jalali, "Photonic time-stretched analog-to-digital converter: Fundamental concepts and practical considerations," J. Lightw. Technol. 21, 3085-3103 (2003).

R. Sadhwani, B. Jalali, "Adaptive CMOS predistortion linearizer for fiber-optic links," J. Lightw. Technol. 21, 3180-3193 (2003).

2002 (1)

S. Dubovitsky, W. H. Steier, S. Yegnanarayanan, B. Jalali, "Analysis and improvement of Mach–Zehnder modulator linearity performance for chirped and tunable optical carriers," J. Lightw. Technol. 20, 886-891 (2002).

2001 (1)

P. W. Juodawlkis, J. C. Twichell, G. E. Betts, J. J. Hargreaves, R. D. Younger, J. L. Wasserman, F. J. O'Donnell, K. G. Ray, R. C. Williamson, "Optically sampled analog-to-digital converters," IEEE Trans. Microw. Theory Tech. 49, 1840-1853 (2001).

2000 (1)

J. C. Twichell, R. Helkey, "Phase-encoded optical sampling for analog-to-digital converters," IEEE Photon. Technol. Lett. 12, 1237-1239 (2000).

1998 (1)

A. S. Bhushan, F. Coppinger, B. Jalali, "Time-stretched analogue-to-digital conversion," Electron. Lett. 34, 1081-1083 (1998).

1997 (1)

D. Piehler, X. Zou, C. Y. Kuo, A. Nilsson, J. Kleefeld, G. Garcia, J. D. Ralston, A. Mathur, "55 dB CNR over 50 km of fiber in an 80-channel externally-modulated AM-CATV system without optical amplification," Electron. Lett. 33, 226-227 (1997).

1996 (1)

G. K. Gopalakrishnan, T. J. Brophy, C. Breverman, "Experimental study of fibre induced distortions in externally modulated 1550 nm analogue CATV links," Electron. Lett. 32, 1309-1310 (1996).

1991 (1)

A. H. Gnauck, S. K. Korotky, J. J. Veselka, J. Nagel, C. T. Kemmerer, W. J. Minford, D. T. Moser, "Dispersion penalty reduction using an optical modulator with adjustable chirp," IEEE Photon. Technol. Lett. 3, 916-918 (1991).

Electron. Lett. (3)

G. K. Gopalakrishnan, T. J. Brophy, C. Breverman, "Experimental study of fibre induced distortions in externally modulated 1550 nm analogue CATV links," Electron. Lett. 32, 1309-1310 (1996).

A. S. Bhushan, F. Coppinger, B. Jalali, "Time-stretched analogue-to-digital conversion," Electron. Lett. 34, 1081-1083 (1998).

D. Piehler, X. Zou, C. Y. Kuo, A. Nilsson, J. Kleefeld, G. Garcia, J. D. Ralston, A. Mathur, "55 dB CNR over 50 km of fiber in an 80-channel externally-modulated AM-CATV system without optical amplification," Electron. Lett. 33, 226-227 (1997).

IEEE Photon. Technol. Lett. (2)

A. H. Gnauck, S. K. Korotky, J. J. Veselka, J. Nagel, C. T. Kemmerer, W. J. Minford, D. T. Moser, "Dispersion penalty reduction using an optical modulator with adjustable chirp," IEEE Photon. Technol. Lett. 3, 916-918 (1991).

J. C. Twichell, R. Helkey, "Phase-encoded optical sampling for analog-to-digital converters," IEEE Photon. Technol. Lett. 12, 1237-1239 (2000).

IEEE Trans. Microw. Theory Tech. (1)

P. W. Juodawlkis, J. C. Twichell, G. E. Betts, J. J. Hargreaves, R. D. Younger, J. L. Wasserman, F. J. O'Donnell, K. G. Ray, R. C. Williamson, "Optically sampled analog-to-digital converters," IEEE Trans. Microw. Theory Tech. 49, 1840-1853 (2001).

J. Lightw. Technol. (3)

Y. Han, B. Jalali, "Photonic time-stretched analog-to-digital converter: Fundamental concepts and practical considerations," J. Lightw. Technol. 21, 3085-3103 (2003).

S. Dubovitsky, W. H. Steier, S. Yegnanarayanan, B. Jalali, "Analysis and improvement of Mach–Zehnder modulator linearity performance for chirped and tunable optical carriers," J. Lightw. Technol. 20, 886-891 (2002).

R. Sadhwani, B. Jalali, "Adaptive CMOS predistortion linearizer for fiber-optic links," J. Lightw. Technol. 21, 3180-3193 (2003).

Opt. Express (1)

Other (3)

Y. Han, B. Jalali, "Differential photonic time-stretch analog-to-digital converter," Lasers Electro-Optics Conf. BaltimoreMD (2003) Paper CWH2.

B. Jalali, F. Coppinger, Data conversion using time manipulation U.S. Patent 6 288 659 (2001).

W. I. Way, Broadband Hybrid Fiber Coax Access System Technologies (Academic, 1998).

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