Advances in Tb/s Superchannels

Chandrasekhar, S.; Liu, Xiang

doi:10.1016/b978-0-12-396960-6.00003-1

Cited by 9 publications

(10 citation statements)

References 74 publications

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“…Here, instead of producing a large number of lines with a single microcomb, we suggest to segment the WDM bandwidth into superchannels, each driven by a narrower microcomb. A superchannel contains a group of channels, which are modulated with high spectral efficiency in the same place, routed together through the same optical path and received together at the same destination [34,35]. This WDM architecture segments the transmission spectrum into multiple superchannels.…”

Section: Introductionmentioning

confidence: 99%

Superchannel engineering of microcombs for optical communications

et al. 2019

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Microresonator frequency combs (microcombs) are a promising technology for generating frequency carriers for wavelength division multiplexing (WDM) systems. Multi-terabit per second WDM coherent transmitters have recently been demonstrated using both dissipative Kerr solitons and mode-locked dark pulses in optical microresonators. These experiments have focused on microcombs designed to cover a large portion of the erbium-doped fiber window. However, the question of optimum bandwidth for mi-crocombs in WDM systems has not been addressed. Here, we show that segmenting the bandwidth into smaller microcomb-driven superchannels results in an improvement of power per line. Through numerical simulations we establish a quantitative comparison between dark-pulse and soliton microcombs in WDM systems, including aspects such as conversion efficiency, tolerance to intrinsic cavity loss and group velocity dispersion engineering. We show that the improvement of minimum line power scales linearly with the number of superchannels for both types of microcombs. This work provides useful guidelines for the design of multi-terabit per second microcomb-based superchannel systems.

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Section: Introductionmentioning

confidence: 99%

Superchannel engineering of microcombs for optical communications

et al. 2019

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“…Superchannels have previously been used to overcome the electrical data rate limits of transmitters by grouping several modulated coherent optical lines into one channel [5]. By segmenting the available bandwidth into smaller superchannels, one gains in flexibility, since each superchannel can feature different line spacing with different modulation formats.…”

Section: Superchannel Engineering With Microresonator Frequency Combsmentioning

confidence: 99%

“…This solution also allows using comb sources in optical networks where dynamic routing using add/drop multiplexers is needed. Superchannels benefit from the line spacing stability provided by frequency comb sources to achieve high spectral efficiency [5].…”

Section: Superchannel Engineering With Microresonator Frequency Combsmentioning

confidence: 99%

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Superchannel Engineering with Microresonator Combs

Helgason

Fülöp

Schröder

et al. 2018

Conference on Lasers and Electro-Optics

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“…In order to achieve higher SE, three major competitive technologies for forming spectrally-efficient wavelength division multiplexing (WDM) superchannels have been proposed so far instead of increasing serial interface rate [1]. One is the orthogonal frequency-division multiplexing (OFDM) technique [1][2][3], where frequency domain sinc-like subcarriers are spaced exactly at the symbol rate to obtain high SE. Another one is referred to Nyquist-WDM, which requires an ideal rectangular shaped spectrum with bandwidth equal to the symbol rate [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Nyquist WDM superchannel using offset-16QAM and receiver-side digital spectral shaping

Xiang

Tang

et al. 2014

Opt. Express

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The performance of Nyquist WDM superchannel using advanced modulation formats with coherent detection is degraded due to the existence of both inter-symbol interference (ISI) and inter-channel interference (ICI). Here, we propose and numerically investigate a Nyquist WDM superchannel using offset-16QAM and receiver-side digital spectral shaping (RS-DSS), achieving a spectral efficiency up to 7.44 bit/s/Hz with 7% hard-decision forward error correction (HD-FEC) overhead. Compared with Nyquist WDM superchannel using 16QAM and RS-DSS, the proposed system has 1.4 dB improvement of required OSNR at BER = 10(-3) in the case of back-to-back (B2B) transmission. Furthermore, the range of launched optical power allowed beyond HD-FEC threshold is drastically increased from -6 dBm to 1.2 dBm, after 960 km SSMF transmission with EDFA-only. In particular, no more than 1.8 dB required OSNR penalty at BER = 10(-3) is achieved for the proposed system even with the phase difference between channels varying from 0 to 360 degree.

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Advances in Tb/s Superchannels

Cited by 9 publications

References 74 publications

Superchannel engineering of microcombs for optical communications

Superchannel engineering of microcombs for optical communications

Superchannel Engineering with Microresonator Combs

Nyquist WDM superchannel using offset-16QAM and receiver-side digital spectral shaping

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