Self-Coherent Systems for Short Reach Transmission

Chen, X.; Chandrasekhar, S.; Winzer, Peter J.

doi:10.1109/ecoc.2018.8535234

Cited by 27 publications

(13 citation statements)

References 9 publications

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“…A strong correlation between the color intensities of the graph can be observed, linking the longer impulse response duration to a larger differential CD value. The longest impulse responses and highest CD values are measured for the cores on the left half of the outer ring (core [25][26][27][28][29][30][31][32][33][34][35].…”

Section: B Analysis Results and Discussionmentioning

confidence: 99%

“…38 of the cores are of the trench assisted graded-index type, designed to support 3-modes each. The last core supports only the fundamental mode, and thus can be employed in self-coherent detection schemes [24]- [27], or -as in this work -as a reference arm for OVNA. Furthermore, it serves as a visible reference marker for core alignment.…”

Section: A Large Core-count Few-mode Fibermentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Modal Dispersion Estimation Enabled by Chromatic Dispersion Compensation in Optical Vector Network Analysis

Weerdenburg

Rommel

Mendinueta

et al. 2019

J. Lightwave Technol.

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Section: B Analysis Results and Discussionmentioning

confidence: 99%

Section: A Large Core-count Few-mode Fibermentioning

confidence: 99%

Enhanced Modal Dispersion Estimation Enabled by Chromatic Dispersion Compensation in Optical Vector Network Analysis

Weerdenburg

Rommel

Mendinueta

et al. 2019

J. Lightwave Technol.

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“…After thoroughly studying the system performance of CADD, we are in a good position to reproduce the comparison between different coherent and direct detection schemes presented in ref. 30 using some relevant cost metrics, as shown in Table 2. For a fair comparison, we also assume that all the detection schemes aim to achieve 200 Gb/s per polarization per wavelength at an OSNR of 30 dB.…”

Section: Discussionmentioning

confidence: 99%

Carrier-assisted differential detection

Shieh

Sun

2020

Light Sci Appl

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To overcome power fading induced by chromatic dispersion in optical fiber communications, optical field recovery is a promising solution for direct detection short-reach applications, such as fast-evolving data center interconnects (DCIs). To date, various direct detection schemes capable of optical field recovery have been proposed, including Kramers −Kronig (KK) and signal−signal beat interference (SSBI) iterative cancellation (IC) receivers. However, they are all restricted to the single sideband (SSB) modulation format, thus conspicuously losing half of the electrical spectral efficiency (SE) compared with double sideband (DSB) modulation. Additionally, SSB suffers from the noise folding issue, requiring a precise optical filter that complicates the receiver design. As such, it is highly desirable to investigate the field recovery of DSB signals via direct detection. In this paper, for the first time, we propose a novel receiver scheme called carrier-assisted differential detection (CADD) to realize optical field recovery of complex-valued DSB signals via direct detection. First, CADD doubles the electrical SE compared with the KK and SSBI IC receivers by adopting DSB modulation without sacrificing receiver sensitivities. Furthermore, by using direct detection without needing a precise receiver optical filter, CADD can employ cost-effective uncooled lasers as opposed to expensive temperature-controlled lasers in coherent systems. Our proposed receiver architecture opens a new class of direct detection schemes that are suitable for photonic integration analogous to homodyne receivers in coherent detection.

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“…Our performance should be compared to that of solutions offered by other researchers [17]- [21]. Traditional approaches include a strong carrier or a guard band to avoid SSBI.…”

Section: Discussionmentioning

confidence: 99%

“…Invoking the formula, the ADC bandwidth requirement is 50.2 GHz to cover the guard band of 25.1 GHz. DSP methods including iterative SSBI cancellation and KK detection could reduce the CSPR to 9 dB and 6 dB respectively [17], [20], [21], leading to reduced ADC bandwidth requirements of 38.3 GHz and 31.6 GHz, respectively. With an enhanced KK receiver, smaller CSPR is required compared to traditional KK, however the received signal is split at reception, invoking a 3 dB OSNR penalty.…”

Section: Discussionmentioning

confidence: 99%

SiP-Based SSBI Cancellation for OFDM

2019

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We propose for the first time to use a silicon photonics (SiP) solution for a passive optical network to both reduce signal-signal beat interference (SSBI) and recuperate a part of the downlink carrier for use in the uplink. The Kramers-Kronig (KK) receiver for direct detection of advanced modulation formats overcomes SSBI at the cost of a moderate carrier to signal ratio (>6 dB) and high oversampling (4 ×). We propose an optical SSBI solution that achieves better performance than KK and requires only standard sampling and low (3 dB) carrier to signal power ratio. The receiver is conceived for the downlink in passive optical networks, where carrier signal must be husbanded for re-use in the uplink. Using cost effective and power efficient SiP, the receiver filters the incoming signal, suppresses SSBI, and routes a portion of the carrier for use in the uplink. We experimentally examine the SSBI suppression in this paper. While previous demonstrations used bulky, discrete components, we achieve significant Q-factor improvement with a simple SiP solution. We examine the optimal frequency offset between the carrier and the microring resonator center frequency. The robustness to frequency drift, as well as the impact of imperfect filtering, is discussed and quantified.

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Self-Coherent Systems for Short Reach Transmission

Cited by 27 publications

References 9 publications

Enhanced Modal Dispersion Estimation Enabled by Chromatic Dispersion Compensation in Optical Vector Network Analysis

Enhanced Modal Dispersion Estimation Enabled by Chromatic Dispersion Compensation in Optical Vector Network Analysis

Carrier-assisted differential detection

SiP-Based SSBI Cancellation for OFDM

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