On-chip dispersive phase filters for optical processing of periodic signals

Kaushal, Saket; Azaña, José

doi:10.1364/ol.400645

Cited by 16 publications

(3 citation statements)

References 14 publications

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“…For instance, widely employed CFBG can be designed to provide an accumulated GVD equivalent to hundreds of km of standard single‐mode optical fiber with much lower insertion losses. Also, novel on‐chip discrete phase filter designs providing large amounts of GVD [ 53 ] are a very promising path toward the integration of the POD in a single chip.…”

Section: Further Discussion and Conclusionmentioning

confidence: 99%

All‐Optical Parametric‐Assisted Oversampling and Decimation for Signal Denoising Amplification

Fernandez

Kaushal

Crockett

et al. 2023

Laser & Photonics Reviews

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Decimation is a common process in digital signal processing that involves reducing the sampling rate of an oversampled signal by linearly combining consecutive samples. Among other applications, this process represents a simple means to mitigate noise content in the digital signal. In this work, a novel optical signal processing concept inspired by these operations is proposed, which is called Parametric‐assisted Oversampling and Decimation (POD). By using a simple all‐fiber setup, the POD processor first realizes an ultra‐fast parametric oversampling of the incoming temporal signal (at >100 Gigasamples per second), a process that is followed by a decimation that reduces the sampling rate by any user‐defined factor in a lossless manner. In this way, the POD delivers an amplified sampled copy of the optical signal, where the peak‐to‐peak gain results from the combination of parametric amplification and a “passive” amplification equal to the decimation factor. In this report, joint parametric and passive amplification by a factor ≈50 on GHz‐bandwidth signals is demonstrated. Furthermore, it is shown that the decimation process can effectively mitigate effects of narrowband noise, outperforming traditional optical and digital filtering techniques. By experimentally achieving ultra‐high decimation factors (>750), narrowband (MHz‐bandwidth) optical waveformsthat are lost in a much stronger noise background are recovered.

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Section: Further Discussion and Conclusionmentioning

confidence: 99%

All‐Optical Parametric‐Assisted Oversampling and Decimation for Signal Denoising Amplification

Fernandez

Kaushal

Crockett

et al. 2023

Laser & Photonics Reviews

Self Cite

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show abstract

“…On the PIC level comparison, the current state-of-the-art Talbot chip using Bragg grating waveguide measures a length of ≈8 mm for 2× RRM at 10 GHz input, while for linearly chirped waveguide Bragg gratings, it would be ≈4 cm (c.f., ref. 33 ). These values are respectively 1.6× and 8.1× larger than our proposed design, that also operates at a much lower repetition rate of 4 GHz.…”

Section: Discussionmentioning

confidence: 99%

“…However, to the best of our knowledge, the on-chip generation of the temporal Talbot effect has rarely been discussed. One of the latest state-of-the-art demonstrations, for example, is spectral phase filtering using a waveguide Bragg grating on silicon 33 . Yet, the limited tunability of the Bragg grating does not allow fine-tuning to produce a higher output quality and leverage the full potential of Talbot photonic chips.…”

Section: Introductionmentioning

confidence: 99%

Bright and dark Talbot pulse trains on a chip

Wu,

Clementi,

Nitiss

et al. 2023

Commun Phys

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Temporal Talbot effect, the intriguing phenomenon of the self-imaging of optical pulse trains, is extensively investigated using macroscopic components. However, the ability to manipulate pulse trains, either bright or dark, through the Talbot effect on integrated photonic chips to replace bulky instruments has rarely been reported. Here, we design and experimentally demonstrate a proof-of-principle integrated silicon nitride device capable of imprinting the Talbot phase relation onto in-phase optical combs and generating the two-fold self-images at the output. We show that the GHz-repetition-rate bright and dark pulse trains can be doubled without affecting their spectra as a key feature of the temporal Talbot effect. The designed chip can be electrically tuned to switch between pass-through and repetition-rate-multiplication outputs and is compatible with other related frequencies. The results of this work lay the foundations for the large-scale system-on-chip photonic integration of Talbot-based pulse multipliers, enabling the on-chip flexible up-scaling of pulse trains’ repetition rate without altering their amplitude spectra.

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Capturing ultra-broadband complex-fields of arbitrary duration using a real-time spectrogram

2023

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One of the most intuitive representations of a waveform is achieved through time-frequency analysis, which depicts how the frequency components of a wave evolve over time. Time-frequency representations, such as the spectrogram, are well-known for allowing full-field characterization of a signal in terms of amplitude and phase. However, present methods to capture the spectrogram of a waveform are only suited for either relatively slow (<GHz bandwidth) waveforms of arbitrary duration or fast (>THz bandwidth) waveforms of short duration. It remains very challenging to capture the time-frequency representation of broadband waves extending over long durations, as required for many important fields in science and technology. Here, we introduce a linear optics temporal imaging concept based on electro-optic time-lensing and dispersive propagation to map the 2D spectrogram as a 1D waveform along the temporal domain. This technique enables ultra-broadband spectrogram analysis without any gaps in the acquisition and with no inherent limitation on maximum signal duration. The spectrogram is captured at unmatched processing rates, up to 16 × 109 Fourier transforms per second (∼60 ps per spectral frame), using a single photodetector and in a fully self-referenced manner. Under certain conditions, we show how this method enables the single-shot full-field characterization of optical waveforms spanning multiple THz. The method is further showcased through accurate amplitude and phase recovery of high-speed complex-modulated optical telecommunication signals using direct intensity detection. This concept will enable the study of physical phenomena unreachable to date and disruptive advancements in high-speed communications, sensing, and information processing.

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On-chip dispersive phase filters for optical processing of periodic signals

Cited by 16 publications

References 14 publications

All‐Optical Parametric‐Assisted Oversampling and Decimation for Signal Denoising Amplification

All‐Optical Parametric‐Assisted Oversampling and Decimation for Signal Denoising Amplification

Bright and dark Talbot pulse trains on a chip

Capturing ultra-broadband complex-fields of arbitrary duration using a real-time spectrogram

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