Abstract
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.
Highlights
Electrical-optical signal processing has been shown to be a promising path to overcome the limitations of state-of-theart all-electrical data converters
We review some of our recent work on chipscale integrated time-interleaved and spectrally-sliced photonically enabled analog-to-digital converter (ADC), with a particular focus on the integration of optical filters with electronic receiver and sampling circuits in electronic-photonic integrated circuits
Architecture, a grating coupler (GC) is used to couple the optical pulse train generated by an mode-locked lasers (MLLs) into the chip, in which an electrical clock signal is generated through an integrated waveguide photodiode (PD) followed by a transimpedance amplifier (TIA)
Summary
WITH the large scale deployment of coherent optical fiber links towards the end of the first decade of the 21st century, the availability and performance of high-speed data converters has first become a bottleneck and later a key performance driver for long-haul communications [1]. A common technique applied in high-speed communications is time interleaving, that consists in interleaving several ADCs, each clocked at a subdivided sampling rate and with an offset clock phase, in order to digitize a faster signal [5],[6]. Frequency interleaving is another such technique [7], in which a broadband signal is sliced into several tributaries each covering a reduced passband.
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