Sub-Rate Sampling in 100 Gb/s Coherent Optical Receivers

Malouin, Christian; Zhang, Bo; Wagner, Andy; Khatana, Sunil; Ibragimov, E.; Jiang, Hong; Schmidt, T. J.

doi:10.1364/ofc.2010.otht3

Cited by 7 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equalizer can work based on the symbol rate, but requires an external error signal to find the best sampling phase, and is very sensitive to aliasing. 14 When the ADC is re-sampled, an antialiasing filter is added in front of the ADC to reduce distortion. When the sampling rate is lower than 2 R s , attention should be paid to the selection of analog filter.…”

Section: Sub-rate Samplingmentioning

confidence: 99%

Low power digital signal processing-lite scheme for short-reach polarization demultiplexing-64 quadrature amplitude modulation coherent optical system

Li,

Ji,

et al. 2023

Opt. Eng.

View full text Add to dashboard Cite

Coherent optical communication critically relies on efficient digital signal processing (DSP). We demonstrate a lite DSP scheme to reduce the transmission cost and power consumption, which is mainly realized by reducing the sampling rate and simplifying the DSP algorithm. On the one hand, the baud-rate sampling technique based on the integral circuit can reduce the amount of data processing in DSP. On the other hand, we proposed a simplified joint modified constant modulus algorithm (MCMA) and phase-dependent decision-directed least mean square (DD-LMS) algorithm for adaptive blind polarization demultiplexing and phase recovery in which the butterfly structure is no longer needed for DD-LMS. And we compare the proposed simplified algorithm with the joint traditional CMA and blind phase search and the MCMA, in terms of performance in the 80-Gbaud dual-polarization 64QAM homodyne detection system. The results show that the proposed lite DSP mechanism can effectively reduce the power consumption of DSP by sub-rate sampling and simplifying the corresponding algorithm, which provides an alternative scheme for low-power optical interconnection of data centers.

show abstract

Section: Sub-rate Samplingmentioning

confidence: 99%

Low power digital signal processing-lite scheme for short-reach polarization demultiplexing-64 quadrature amplitude modulation coherent optical system

Li,

Ji,

et al. 2023

Opt. Eng.

View full text Add to dashboard Cite

show abstract

“…It is generally suggested to run the ADC at 29 the baud rate for coherent detection, resulting in a sampling rate requirement of 56-64 GS/s [2]. Chromatic dispersion and polarization mode dispersion impact the signal integrity of long optical fibers.…”

Section: Itu-otu4mentioning

confidence: 99%

Energy-Efficient High-Speed SAR ADCs in CMOS

Kull

Toifl

Schmatz

et al. 2014

High-Performance AD and DA Converters, IC Design in Scaled Technologies, and Time-Domain Signal Processing

View full text Add to dashboard Cite

An ADC featuring a new architecture for an 8 b 649 interleaved CMOS ADC running at up to 100 GHz sampling frequency is presented. The ADC fulfills all specifications for 100 Gb/s ITU-OTU4 communication over long-distance optical fiber channels. It is based on a SAR ADC, known for its superior energy efficiency and suitability for deep-submicron digital CMOS processes, as the comparator is the only true analog element. Several improvements to existing SAR ADC architectures are presented. Alternate comparators are used to increase the sampling speed at no power and area penalty, and dynamic memory is used to reduce latency in the CDAC feedback. A deep-trench capacitor-based reference buffer significantly reduces power at low output impedance, and a differential CDAC with constant common mode and fractional reference voltages optimizes comparator performance and silicon area. The 649 interleaved ADC consists of a dedicated sampling and interleaving block and 64 SAR ADCs. Four interleaved passive samplers based on a sampling switch with in-line 1:4 demultiplexer provide an initial 1:16 interleaving with high linearity and more than 20 GHz input bandwidth while using only a single supply voltage.

show abstract

Optimized Sub-Rate Sampling in 80Gbaud DP-64QAM Coherent Optical Receivers

Liu

et al. 2021

2021 7th International Conference on Computer and Communications (ICCC)

View full text Add to dashboard Cite

Sub-Rate Sampling in 100 Gb/s Coherent Optical Receivers

Cited by 7 publications

References 2 publications

Low power digital signal processing-lite scheme for short-reach polarization demultiplexing-64 quadrature amplitude modulation coherent optical system

Low power digital signal processing-lite scheme for short-reach polarization demultiplexing-64 quadrature amplitude modulation coherent optical system

Energy-Efficient High-Speed SAR ADCs in CMOS

Optimized Sub-Rate Sampling in 80Gbaud DP-64QAM Coherent Optical Receivers

Contact Info

Product

Resources

About