Optical Arbitrary Waveform Measurement (OAWM) Using Silicon Photonic Slicing Filters

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

“…3 (a). These findings are well in line with previous results that relied on the same transmitter setup, showing a CSNR of 18.6 dB for a single IQ receiver and CSNR of 19.2 dB for a four-channel spectrally sliced OAWM system [5]. We additionally record the acquisition noise acq ( ) f G  of the ADC (Keysight UXR series oscilloscope) with all optical signals being disconnected.…”

“…Due to the lower bandwidths of the individual data signals, the quality of the transmitted signals is improved, and the CSNR obtained for the OAWM system increases to 21.4 dB and 22.2 dB, respectively. The receiver bandwidth can well compete with previous demonstrations of integrated spectrally sliced OAWM receivers that still relied on external photodiodes [5].…”

“…ptical arbitrary waveform measurement (OAWM) based on frequency combs gives access to the full-field information of broadband optical waveforms [1][2][3][4][5][6][7][8][9]. Applications range from reception of high-speed communication signals [2][3][4][5][6][7][8][9] and elastic optical networking [4] This work was supported by the ERC Consolidator Grant TeraSHAPE (# 773248), by the EU H2020 project TeraSlice (# 863322), by the DFG projects PACE (# 403188360) and GOSPEL (# 403187440) within the Priority Programme SPP 2111 "Electronic-Photonic Integrated Systems for Ultrafast Signal Processing" and via the DFG Collaborative Research Center (CRC) HyPERION (SFB 1527), by the BMBF project Open6GHub (# 16KISK010), by the EU H2020 Marie Skłodowska-Curie Innovative Training Network MICROCOMB (# 812818), by the Alfried Krupp von Bohlen und Halbach to ultra-broadband photonic-electronic analog-to-digital conversion [10][11][12][13] and investigation of ultra-short events in science and technology [1]. Previous demonstrations of combbased OAWM have relied on spectrally sliced reception, where the broadband optical input signal is first decomposed into a multitude of narrowband spectral slices by appropriate optical filters.…”

“…Previous demonstrations of combbased OAWM have relied on spectrally sliced reception, where the broadband optical input signal is first decomposed into a multitude of narrowband spectral slices by appropriate optical filters. These slices are then individually received by an array of in-phase/quadrature receivers (IQR) using a frequency comb as multi-wavelength local oscillator (LO), and the original waveform is reconstructed by spectral stitching of the received tributaries in the frequency domain [1][2][3][4][5]. However, this concept suffers from the complexity of the underlying highquality optical filters, which are required both for spectral slicing of the optical signal and for separating the LO comb tones.…”

“…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.…”