Passband Narrowing and Crosstalk Impairments in ROADM-Enabled 100G DWDM Networks

Hsueh, Yu-Ting; Stark, Andrew; Liu, Cheng; Detwiler, Thomas; Tibuleac, Sorin; Filer, Mark; Chang, Gee‐Kung; Ralph, Stephen E.

doi:10.1109/jlt.2012.2208262

Cited by 32 publications

(16 citation statements)

References 22 publications

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“…An RZ carver was selectively utilized for different experiments; the RZ carver is comprised of a MZM driven with a sinusoidal clock synchronous to the data stream. RZ carving offers better transmission performance in certain link configurations [14]. Waveform generation for long-haul transport has evolved beyond NRZ/RZ to support "per wavelength" Fig.…”

Section: A Transmitters and Modulationmentioning

confidence: 99%

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Advanced signaling technologies for high-speed digital fiber-optic links

et al. 2014

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We summarize the most recent research of the Georgia Tech Terabit Optical Networking Consortium and the state-of-the-art in fiber telecommunications. These results comprise high-capacity single-mode fiber systems with digital coherent receivers and shorter-reach multimode fiber links with vertical cavity surface emitting lasers. We strongly emphasize the capabilities that sophisticated digital signal processing and electronics add to these fiber-based data transport links.

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Section: A Transmitters and Modulationmentioning

confidence: 99%

“…The number of circulations is limited by the EDFA-induced ASE noise limit and any enhanced nonlinear effects. Extensive transmission results are available in [13,14,27].…”

Section: Georgia Tech Terabit Optical Network Testbedmentioning

confidence: 99%

Advanced signaling technologies for high-speed digital fiber-optic links

et al. 2014

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“…In particular, each ROADM device acts as a narrowband filter (typically with a slot width of 50 GHz) and when several such devices are cascaded along an optical fiber link the concatenated optical bandwidth can be lower than 50 GHz, causing transmission penalty in dense wave division multiplexing (DWDM) networks. [4][5][6][7] This effect limits the amount of devices the signal can pass through without causing considerable performance degradation, hence setting a limit on the transmission range before regeneration is required. 8 Many works have been devoted to find a way to limit the existing penalties in the use of the ROADM cascade in both WDM channels, 4 and 100Gb/s DWDM networks.…”

Section: Introductionmentioning

confidence: 99%

Improving the performance of NRZ‐DPSK optical fiber networks using adaptive FSR in the receiver

Haridim

Afrimov

Milgrom

et al. 2020

Micro & Optical Tech Letters

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In this work, we consider the impact of spectral narrowing of 43Gb/s NRZ-DPSK signals on the system performance. NRZ-DPSK signals passing through reconfigurable optical add/drop multiplexer (ROADM) devices are subject to spectral narrowing due to the narrow bandwidth of ROADMs. For a system level analysis of this phenomenon, we model the ROADM devices as a bandpass filter, the bandwidth of which is deliberately decreased. The dependence of the system performance on the delay time between adjacent bits in the receiver is also investigated. It is shown that the performance of signals passing through ROADM devices can be improved with an appropriate delay line interferometer (DLI) for any amount of devices. These results were obtained by simulating the whole system performance using different values of the BPF bandwidth and FSR. We present a technique for finding the optimal FSR of DLI that allows for improving the performance of NRZ-DPSK systems in the presence of spectral narrowing of the channel. Improved bit error ratio is achieved by using optimized FSR for each BW.

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“…In [4], an accurate model is developed to predict the final bandwidth of the signal after passing through multiple cascaded ROADMs. In [5,6], the weighted crosstalk method is used to estimate the transmission penalty, including the effects of signal bandwidth narrowing, crosstalk filtering, and nonlinear-enhance crosstalk. In [7], the impact of the random group delay ripple on multiple cascading ROADMs is thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Compensation of Bandwidth Narrowing Effect for Coherent In-Phase Quadrature Transponder through Finite Impulse Response Filter

et al. 2019

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Coherent in-phase quadrature (IQ) transponders are ubiquitous in the long-haul and the metro optical networks. During the transmission, the coherent signal experiences a bandwidth narrowing effect after passing through multiple reconfigurable optical add-drop multiplexers (ROADMs). The coherent signal also experiences a bandwidth narrowing effect when electrical or optical components of the coherent IQ transponder experience aging. A dynamic method to compensate the bandwidth narrowing effect is thus required. In the coherent optical receiver, signal bandwidth is estimated from the raw analog-to-digital converter (ADC) outputs. By adaptively adjusting the tap coefficients of the finite impulse response (FIR) filter, simple post-ADC FIR filters can increase the resiliency of the coherent signal to the bandwidth narrowing effect. The influence of chromatic dispersion, polarization mode dispersion, and polarization dependent loss are studied comprehensively. Furthermore, the bandwidth information of the transmitted analog signal is fed back to the coherent optical transmitter for signal optimization, and the transmitter-side FIR filter thus changes accordingly.

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Passband Narrowing and Crosstalk Impairments in ROADM-Enabled 100G DWDM Networks

Cited by 32 publications

References 22 publications

Advanced signaling technologies for high-speed digital fiber-optic links

Advanced signaling technologies for high-speed digital fiber-optic links

Improving the performance of NRZ‐DPSK optical fiber networks using adaptive FSR in the receiver

Adaptive Compensation of Bandwidth Narrowing Effect for Coherent In-Phase Quadrature Transponder through Finite Impulse Response Filter

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