WDM pilot tone technique for analogue optical links

Basak, J.; Sadhwani, R.; Jalali, Bahram

doi:10.1049/el:20030658

Cited by 3 publications

(6 citation statements)

References 2 publications

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“…However, there can be small bias offsets that introduce significant second-order nonlinearity in the link. Mach-Zehnder bias control, which can be achieved using several techniques including one discussed in [15], can be very useful in reducing bias errors to a large extent. Even using a bias control solution, some residual bias errors could still be present.…”

Section: Dispersion-induced Nonlinearitiesmentioning

confidence: 99%

Two-Dimensional Spatio-Temporal Signal Processing for Dispersion Compensation in Time-Stretched ADC

Tarighat

Gupta

Sayed

et al. 2007

J. Lightwave Technol.

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Abstract-Time-stretched analog-to-digital converters (ADCs) have offered revolutionary enhancements in the performance of electronic converters by reducing the signal bandwidth prior to digitization. An inherent limitation of the time-stretched ADC is the frequency-selective response of the optical system that reduces the effective number of bits for ultrawideband signals. This paper proposes a solution based on spatio-temporal digital processing. The digital algorithm exploits the optical phase diversity to create a flat RF frequency response, even when the system's transfer function included deep nulls within the signal spectrum. For a 10× time-stretch factor with a 10-GHz input signal, simulations show that the proposed solution increases the overall achievable signal-to-noise-and-distortion ratio to 52 dB in the presence of linear distortions. The proposed filter can be used to mitigate the dispersion penalty in other fiber optic applications as well.Index Terms-Analog-to-digital conversion (ADC), optical signal processing, spatio-temporal digital processing, time-stretched converters.

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Section: Dispersion-induced Nonlinearitiesmentioning

confidence: 99%

Two-Dimensional Spatio-Temporal Signal Processing for Dispersion Compensation in Time-Stretched ADC

Tarighat

Gupta

Sayed

et al. 2007

J. Lightwave Technol.

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“…Such systems require real-time detection of IM power and continuous-time adaptivity of the predistortion circuit. One possible enabling approach is the recently proposed WDM pilot technique [15], summarized hereafter.…”

Section: B Measuring Im3 Generated By Two-tone Test Signalmentioning

confidence: 99%

“…A novel technique that can solve this problem in externally modulated links is the WDM pilot tone technique, shown in Fig. 31 [15]. Here, a separate laser is used for detecting the distortion power.…”

Section: Wdm Pilot Tone Techniquementioning

confidence: 99%

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Adaptive CMOS predistortion linearizer for fiber-optic links

Sadhwani

Jalali

2003

J. Lightwave Technol.

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Nonlinearity in the electrical-to-optical conversion limits the dynamic range for transmitting analog and multilevel signals over fiber-optic channels. We describe a complementary metal-oxide-semiconductor (CMOS) predistortion linearizer that extends the dynamic range of both direct and externally modulated links. The linearizer achieves 13-24-dB suppression for both second-and third-order distortions.

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“…Electronic pre-and post-distortion techniques have proven to be a highly versatile technique for suppressing intermodulation distortion in RF and optical communication links [1][2][3]. These techniques rely on intentional generation of intermodulation tones that are equal in amplitude and opposite in phase to those produced by the nonlinear device or the transmission medium.…”

Section: Introductionmentioning

confidence: 99%

Adaptive optical post distortion linearization

Chou¹,

Boyraz²,

Jalali³

2005

Opt. Express

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A technique to suppress optical nonlinearities is demonstrated using adaptive optical domain post distortion. The concept, rooted in electrical domain linearization, mitigates optical nonlinearities by generating sidebands that are equal but opposite in phase from the unwanted components. We model and experimentally demonstrate >20 dB extinction in four wave mixing by an adaptive phase controller and computer feedback loop.

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WDM pilot tone technique for analogue optical links

Abstract: and yields a good SNR in the cyc measurements of milliwatt signals with 25 fl sampling pulses (4 pW average power). This small power requirement allows a simpler sampling setup. Finally, thc optical bandwidth of the sampling setup is 350 GHr.

Cited by 3 publications

References 2 publications

Two-Dimensional Spatio-Temporal Signal Processing for Dispersion Compensation in Time-Stretched ADC

Two-Dimensional Spatio-Temporal Signal Processing for Dispersion Compensation in Time-Stretched ADC

Adaptive CMOS predistortion linearizer for fiber-optic links

Adaptive optical post distortion linearization

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