All-optical chromatic dispersion monitoring of a 40-Gb/s RZ signal by measuring the XPM-generated optical tone power in a highly nonlinear fiber

Luo, Tao; Chen, Yu; Pan, Zhongqi; Wang, Y.; McGeehan, J.E.; Adler, M.; Willner, Alan E.

doi:10.1109/lpt.2005.862359

Cited by 34 publications

(9 citation statements)

References 8 publications

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“…Figure 1(b) compares the calculated G(f) and S(f) for a hypersecant function {I(t) = sech 2 (t)} broadened by different amounts of dispersion. The curves highlight how G(f) narrows inversely with pulse width while S(f) remains unchanged, which is the well known basis for dispersion monitoring [7], [8], [10]. Measuring G(f) without the bandwidth constraints of a photo-detector connected to an electrical spectrum analyser, was demonstrated using the optical Kerr-effect of a waveguide during co-propagation of the signal at center frequency f s , with a weaker cw probe at frequency f p [6].…”

Section: Operating Principle and Waveguide Propertiesmentioning

confidence: 94%

“…1(a), enables the signal RF spectrum to be captured on an optical spectrum analyzer (OSA) with measurement bandwidths of ≈800 GHz [6]. Its effectiveness for performance monitoring of 40 Gb/s signals [7], [8] has been demonstrated. However, capturing the broader RF spectrum of shorter pulses, also relies on avoiding chromatic dispersion in the waveguide, which can distort the signal under test, and weaken its nonlinear interaction with the copropagating probe due to their group-velocity mismatch [9], i.e.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz bandwidth RF spectrum analysis of femtosecond pulses using a chalcogenide chip

Pelusi¹,

Vo²,

Luan³

et al. 2009

Opt. Express

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We report the first demonstration of the use of an RF spectrum analyser with multi-terahertz bandwidth to measure the properties of femtosecond optical pulses. A low distortion and broad measurement bandwidth of 2.78 THz (nearly two orders of magnitude greater than conventional opto-electronic analyzers) was achieved by using a 6 cm long As(2)S(3) chalcogenide waveguide designed for high Kerr nonlinearity and near zero dispersion. Measurements of pulses as short as 260 fs produced from a soliton-effect compressor reveal features not evident from the pulse's optical spectrum. We also applied an inverse Fourier transform numerically to the captured data to re-construct a time-domain waveform that resembled pulse measurement obtained from intensity autocorrelation.

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Section: Operating Principle and Waveguide Propertiesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Terahertz bandwidth RF spectrum analysis of femtosecond pulses using a chalcogenide chip

Pelusi¹,

Vo²,

Luan³

et al. 2009

Opt. Express

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“…There is no measurable change on the RZ-DPSK signal's optical spectrum although the pulse is significantly distorted by the accumulated chromatic dispersion. Therefore, we propose an all-optical monitoring method based on the XPM effect [9] in HNLF particularly for high-speed phase-modulated signals. A monochromatic continuous wave (CW) probe (λ probe ) is coupled into HNLF together with a 40-Gb/s RZ-DPSK input signal (λ signal ), which is degraded by the CD-induced pulse broadening.…”

Section: Conceptmentioning

confidence: 99%

Chromatic Dispersion Monitoring of 40-Gb/s RZ-DPSK and 80-Gb/s RZ-DQPSK Data Using Cross-Phase Modulation in Highly-Nonlinear Fiber and a Simple Power Monitor

Yang

Zhang

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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We experimentally demonstrate an all-optical chromatic dispersion monitoring technique utilizing cross-phase modulation in highly-nonlinear fiber for 40-Gb/s RZ-DPSK. Maximum monitored power variation of 16.5-dB is achieved in the presence of up to 120-ps/nm chromatic dispersion. OCIS codes: (060.2330) Fiber optics communications; (060.2360) Fiber optics links and subsystems IntroductionAs in all optical networks, a key potential feature to enable stability and flexibility would be all-optical performance monitoring, such that any cause of data degradation is monitored and isolated in real time. Degrading effects, such as chromatic dispersion (CD) accumulation, can change with temperature, plant maintenance, and path reconfiguration. The monitor could be used to either drive a compensator/equalizer or reroute the traffic. Key features of any optical performance monitor are simplicity in implementation and the ability to accommodate the different types of data modulation formats.Phase-encoded and multi-level modulation formats have emerged as exciting candidates for enhancing the sensitivity, robustness and spectral efficiency of optical fiber communication systems. Specifically, differentialphase-shift-keying (DPSK) and differential-quadrature-phase-shift-keying (DQPSK) offer many of the above advantages, and a straightforward delay-line interferometer (DLI) is needed instead of a local oscillator. However, advanced modulation formats tend to pose additional challenges to the design of performance monitors.There have been several reports of chromatic dispersion monitoring recently demonstrated, including: (i) asynchronous histogram evaluation [1-3]; (ii) RF tone measurement [4-5]; (iii) electrical dispersion compensation [6]; and (iv) four-wave mixing and self-phase modulation in fiber [7][8]. However, each of these approaches tends to require either high-speed components (e.g., oscilloscope, photodetector and analog-to-digital converter), a tunable DLI to demodulate phase-modulated data before detection, or high data input power. A laudable goal would be a chromatic dispersion monitor that is simple, does not require high-speed components and can accommodate different modulation formats.In this paper, we propose and experimentally demonstrate a chromatic dispersion monitoring method using the cross-phase modulation (XPM) effect in highly-nonlinear fiber (HNLF) and a simple optical power monitor for a 40-Gb/s RZ-DPSK signal. At the output of HNLF, the phase of an added probe signal is modulated by the CDinduced pulse broadening of a RZ-DPSK signal, resulting in measurable optical power variations on the probe's spectrum. This technique can monitor a change of RZ-DPSK signal in chromatic dispersion from 0 to 120-ps/nm with a maximum optical power variation of 16.5 dB. The simulation results further show that this technique can be extended to 80-Gb/s RZ-DQPSK and 40-Gb/s RZ-OOK data. This technique is simple, and no modification of the transmitter or high-speed components are required for measurements.

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“…(Note that PMD and optical signal-to-noise ratio-OSNR-monitoring can also be obtained through a different use of a tunable narrowband filter. 9,10 )…”

Section: Dispersion-an Example Of Optical Performance Monitoringmentioning

confidence: 99%

Self-managing intelligent optical networks for smarter, tougher, and cheaper systems

Willner¹

2006

SPIE Newsroom

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Thanks to their self-monitoring and ability to dynamically reconfigure themselves, 'self-managed networks' hold great promise in reducing the enormous expenditures currently required to deploy new nodes or upgrade existing links. When envisioning the 10-year horizon of optical networks, there are certain laudable goals that may be pursued, such as higher capacity, throughput, stability, reconfigurability, flexibility, and security. These network goals come with a rich set of technical challenges. Today's optical networks function in a fairly static fashion and are built to operate within well-defined specifications. 1 These networks require an enormous expenditure in order to deploy new nodes or upgrade existing links. This is quite primitive when compared to a typical wireless local-area-network (LAN) that can accommodate new users in a robust, autonomous manner. Specifically, it might be desirable for a highly-efficient Continued on next page

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All-optical chromatic dispersion monitoring of a 40-Gb/s RZ signal by measuring the XPM-generated optical tone power in a highly nonlinear fiber

Cited by 34 publications

References 8 publications

Terahertz bandwidth RF spectrum analysis of femtosecond pulses using a chalcogenide chip

Terahertz bandwidth RF spectrum analysis of femtosecond pulses using a chalcogenide chip

Chromatic Dispersion Monitoring of 40-Gb/s RZ-DPSK and 80-Gb/s RZ-DQPSK Data Using Cross-Phase Modulation in Highly-Nonlinear Fiber and a Simple Power Monitor

Self-managing intelligent optical networks for smarter, tougher, and cheaper systems

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