Optimized hourglass-shaped resonators for efficient thermal tuning of CROW filters with reduced crosstalk

Müller, Juliana; Zazzi, Andrea; Rajeswari, Gayatri Vasudevan; Mashayekh, Alireza Tabatabaei; Das, Arka Dipta; Merget, Florian; Witzens, Jeremy

doi:10.1109/gfp51802.2021.9673904

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…An average 100 mW per slice is required with the implemented thermal phase shifters to tune a 3 rd order CROW filter and a single ring OADM, which is a significant overhead added to the 360 mW (4V × 90 mA) power consumption of the TIA+VGA slice in the RF electronics. The power required to tune the filters by an FSR is also relatively insensitive on the filter bandwidth and FSR [37], [43], thus forming a nearly fixed power overhead per slice. It is thus advantageous to choose relatively wide slices, with bandwidths limited by the chosen electronics technology.…”

Section: B Experimental Resultsmentioning

confidence: 99%

“…Active tuning and resonant wavelength stabilization of the CROW filters is essential in this system, due to the high temperature sensitivity of silicon photonics ring resonators. The hourglass shape of the rings has been optimized to allow for efficient thermal phase tuning, while at the same time reducing thermal crosstalk between adjacent rings [37]. Therefore, we divided the rings in coupling and thermal phase tuner sections, implemented as doped resistors directly in the waveguide.…”

Section: A Epic Integrated Devicesmentioning

confidence: 99%

“…Moreover, sufficient separation is kept between phase shifters of different rings to reduce cross-talk and prevent thermal runaway during execution of the control algorithm. The required tuning power for the implemented CROW filters is 50 mW per FSR [37].…”

Section: A Epic Integrated Devicesmentioning

confidence: 99%

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Optically Enabled ADCs and Application to Optical Communications

Zazzi

Müller

Weizel

et al. 2021

IEEE Open J. Solid-State Circuits Soc.

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Electrical-optical signal processing has been shown to be a promising path to overcome the limitations of state-of-theart all-electrical data converters. In addition to ultra-broadband signal processing, it allows leveraging ultra-low jitter mode-locked lasers and thus increasing the aperture jitter limited effective number of bits at high analog signal frequencies. In this paper, we review our recent progress towards optically enabled time-and frequency-interleaved analog-to-digital converters, as well as their monolithic integration in electronic-photonic integrated circuits. For signal frequencies up to 65 GHz, an optoelectronic track-andhold amplifier based on the source-emitter-follower architecture is shown as a power efficient approach in optically enabled BiCMOS technology. At higher signal frequencies, integrated photonic filters enable signal slicing in the frequency domain and further scaling of the conversion bandwidth, with the reconstruction of a 140 GHz optical signal being shown. We further show how such optically enabled data converter architectures can be applied to a nonlinear Fourier transform based integrated transceiver in particular and discuss their applicability to broadband optical links in general.

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Section: B Experimental Resultsmentioning

confidence: 99%

Section: A Epic Integrated Devicesmentioning

confidence: 99%

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Optically Enabled ADCs and Application to Optical Communications

Zazzi

Müller

Weizel

et al. 2021

IEEE Open J. Solid-State Circuits Soc.

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“…Specifically, while IQ receivers can be efficiently integrated using readily available high-index-contrast photonic platforms such as silicon photonics (SiP) or indium phosphide (InP), high-quality filters are much more challenging to implement in these material systems due to their sensitivity to fabrication inaccuracies and resulting phase errors. As an example, previous demonstrations of integrated OAWM receivers either relied on InP-based arrayed waveguide gratings (AWG) that required individual phase correction in the various arms [14], or on SiP coupled-resonator optical waveguide (CROW) structures [5,15] that need sophisticated control schemes for thermal tuning. To overcome these challenges, we recently proposed and demonstrated a non-sliced OAWM scheme [6,7], which does not require any high-quality slicing filters.…”

Section: Introductionmentioning

confidence: 99%

Non-Sliced Optical Arbitrary Waveform Measurement (OAWM) Using a Silicon Photonic Receiver Chip

Drayss,

Fang,

Füllner

et al. 2024

J. Lightwave Technol.

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Comb-based optical arbitrary waveform measurement (OAWM) techniques can overcome the bandwidth limitations of conventional coherent detection schemes and may have a disruptive impact on a wide range of scientific and industrial applications. Over the previous years, different OAWM schemes have been demonstrated, showing the performance and application potential of the concept in laboratory experiments.However, these demonstrations still relied on discrete fiber-optic components or on combinations of discrete coherent receivers with integrated optical slicing filters that require complex tuning procedures to achieve the desired performance. In this paper, we demonstrate the first wavelength-agnostic OAWM front-end that is integrated on a compact silicon photonic chip and that neither requires slicing filters nor active controls. Our OAWM system comprises four IQ receivers, which are accurately calibrated using a femtosecond mode-locked laser and which offer a total acquisition bandwidth of 170 GHz. Using sinusoidal test signals, we measure a signal-to-noise-and-distortion ratio (SINAD) of 30 dB for the reconstructed signal, which corresponds to an effective number of bits (ENOB) of 4.7 bit, where the underlying electronic analog-to-digital converters (ADC) turn out to be the main limitation. The performance of the OAWM system is further demonstrated by receiving 64QAM data signals at symbol rates of up to 100 GBd, achieving constellation signal-to-noise ratios (CSNR) that are on par with those obtained for conventional coherent receivers. In a theoretical scalability analysis, we show that increasing the channel count of non-sliced OAWM systems can improve both the acquisition bandwidth and the signal quality. We believe that our work represents a key step towards out-of-lab use of highly compact OAWM systems that rely on chip-scale integrated optical front-ends.

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