Design of Ultra-Compact On-Chip Discrete Phase Filters for Broadband Dispersion Management

Kaushal, Saket; Azaña, José

doi:10.1109/jlt.2021.3107834

J. Lightwave Technol.

2021

DOI: 10.1109/jlt.2021.3107834

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Design of Ultra-Compact On-Chip Discrete Phase Filters for Broadband Dispersion Management

Saket Kaushal

José Azaña

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Cited by 4 publications

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Chip‐Scale Dispersion Compensation of High‐Speed Data – Recent Progress and Future Perspectives

Chen,

Ong,

Tan

2024

Laser & Photonics Reviews

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High‐speed data movement in data center communications and telecommunications is the cornerstone of society's connectivity. It serves as a critical driver of economic activity, social networks, and education. Complementary metal‐oxide semiconductor compatible silicon‐based photonic integrated circuits have proliferated transceiver technology, owing to their ease of integration with application‐specific integrated circuits and mass manufacturability. Fiber impairments in the transmission of high‐speed data stem from both optical attenuation and optical dispersion. As data rates scale and modulation formats advance, the impact of fiber dispersion even at shorter reaches becomes more important to address. In this review article, recent advancements made in integrated, chip‐scale dispersion compensation solutions are covered. The focus on chip‐scale devices stems from their ability to be easily integrated within the transmitter or receiver chip of transceivers. Future perspectives on how these devices may become commonplace within transceivers and their potential impact are discussed.

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Chip‐Scale Dispersion Compensation of High‐Speed Data – Recent Progress and Future Perspectives

Chen,

Ong,

Tan

2024

Laser & Photonics Reviews

View full text Add to dashboard Cite

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Four-wave mixing based spectral Talbot amplifier for programmable purification of optical frequency combs

Li,

Xie,

Zhang

et al. 2024

APL Photonics

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Optical frequency combs (OFCs) with programmable free spectral range and high optical carrier-to-noise ratio (CNR) play a crucial role in diverse research fields, including telecommunications, spectroscopy, quantum information, astronomy, sensing, and imaging. Unfortunately, the presence of stochastic noise often results in degraded optical CNR, leading to limited communication performance and measurement accuracy in comb-based systems. There is a lack of effective and flexible methods to improve the CNR of OFCs contaminated by broadband noise, hampering their widespread utilization. To address this challenge, we propose a four-wave mixing based spectral Talbot amplifier to purify OFCs flexibly. Our approach employs programmable spectral phase filters followed by a nonlinear Kerr medium to regenerate an OFC with superior CNR. In our experimental demonstration, we regenerated a 165-GHz spaced CNR enhanced OFC from a noise-dominated comb source spaced at 11 GHz, achieving up to ∼11-dB CNR improvement. The technique allows for a user-defined purification factor m to range from 7 to 15. Furthermore, our scheme demonstrates flexibility in adjusting the wavelengths of the regenerated comb lines via a tunable optical delay line without the need for a tunable seed laser. We also investigated the impact of the pump and signal on the regenerated comb experimentally and studied the influence of dispersion mismatch on the suppression of undesired sidebands numerically. Our proposed scheme presents a powerful alternative for programmable purification, manipulation, and detection of noise-dominated spectral waveforms.

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Ultra-compact silicon photonics highly dispersive elements for low-latency signal processing

et al. 2023

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On-chip optical group-velocity dispersion (GVD) is highly desired for a wide range of signal processing applications, including low-latency and low-power-consumption dispersion compensation of telecommunication data signals. However, present technologies, such as linearly chirped waveguide Bragg gratings (LCWBGs), employ spectral phase accumulation along the frequency spectrum. To achieve the needed specifications in most applications, this strategy requires device lengths that are not compatible with on-chip integration while incurring in relatively long processing latencies. Here, we demonstrate a novel design strategy that utilizes a discretized and bounded spectral phase filtering process to emulate the continuous spectral phase variation of a target GVD line. This leads to a significant reduction of the resulting device length, enabling on-chip integration and ultra-low latencies. In experiments, we show GVD compensation of both NRZ and PAM4 data signals with baud rates up to 24 GBd over a 31.12-km fibre-optic link using a 4.1-mm WBG-based on-chip phase filter in a silicon-on-insulator (SOI) platform, at least 5× shorter compared to an equivalent LCWBG, reducing the processing latency down to ∼ 100 ps. The bandwidth of the mm-long device can be further extended to the THz range by employing a simple and highly efficient phase-only sampling of the grating profile. The proposed solution provides a promising route toward a true on-chip realization of a host of GVD-based all-optical analog signal processing functionalities.

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Design of Ultra-Compact On-Chip Discrete Phase Filters for Broadband Dispersion Management

Cited by 4 publications

References 50 publications

Chip‐Scale Dispersion Compensation of High‐Speed Data – Recent Progress and Future Perspectives

Chip‐Scale Dispersion Compensation of High‐Speed Data – Recent Progress and Future Perspectives

Four-wave mixing based spectral Talbot amplifier for programmable purification of optical frequency combs

Ultra-compact silicon photonics highly dispersive elements for low-latency signal processing

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