Distortion cancellation in time-stretch analog-to-digital converter

被引：45

作者：

Gupta, Shalabh ^{[1
]}

Valley, George C. ^{[2
]}

Jalali, Bahram ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Elect Engn, Optoelect Circuits & Syst Lab, Los Angeles, CA 90095 USA

[2] Aerosp Corp, El Segundo, CA 90245 USA

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2007年 / 25卷 / 12期

关键词：

analog-to-digital conversion; electrooptic modulation; nonlinear distortion; optical communication; optical fiber dispersion;

D O I：

10.1109/JLT.2007.909343

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：3716 / 3721

页数：6

共 13 条

[1] Time-stretched analague-to-digital conversion [J].

Bhushan, AS ;

Coppinger, F ;

Jalali, B .

ELECTRONICS LETTERS, 1998, 34 (11) :1081-1083

[2]

Dubovitsky S, 2002, J LIGHTWAVE TECHNOL, V20, P858

[3] DISPERSION PENALTY REDUCTION USING AN OPTICAL MODULATOR WITH ADJUSTABLE CHIRP [J].

GNAUCK, AH ;

KOROTKY, SK ;

VESELKA, JJ ;

NAGEL, J ;

KEMMERER, CT ;

MINFORD, WJ ;

MOSER, DT .

IEEE PHOTONICS TECHNOLOGY LETTERS, 1991, 3 (10) :916-918

[4] Experimental study of fibre induced distortions in externally modulated 1550nm analogue CATV links [J].

Gopalakrishnan, GK ;

Brophy, TJ ;

Breverman, C .

ELECTRONICS LETTERS, 1996, 32 (14) :1309-1310

[5] Photonic time-stretched analog-to-digital converter: Fundamental concepts and practical considerations [J].

Han, Y ;

Jalali, B .

JOURNAL OF LIGHTWAVE TECHNOLOGY, 2003, 21 (12) :3085-3103

[6]

HAN Y, 2003, LAS EL OPT C BALT MD

[7]

Jalali B., 2001, US Patent, Patent No. [6,288,659, 6288659]

[8] Optically sampled analog-to-digital converters [J].

Juodawlkis, PW ;

Twichell, JC ;

Betts, GE ;

Hargreaves, JJ ;

Younger, RD ;

Wasserman, JL ;

O'Donnell, FJ ;

Ray, KG ;

Williamson, RC .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2001, 49 (10) :1840-1853

[9] 55dB CNR over 50km of fibre in an 80-channel externally-modulated AM-CATV system without optical amplification [J].

Piehler, D ;

Zou, X ;

Kuo, CY ;

Nilsson, A ;

Kleefeld, J ;

Garcia, G ;

Ralston, JD ;

Mathur, A .

ELECTRONICS LETTERS, 1997, 33 (03) :226-227

[10] Adaptive CMOS predistortion linearizer for fiber-optic links [J].

Sadhwani, R ;

Jalali, B .

JOURNAL OF LIGHTWAVE TECHNOLOGY, 2003, 21 (12) :3180-3193

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