5 papers
220-GBd optical coherent waveform generation using temporal unitary transforms
Callum Deakin, Xi Chen, Di Che
We use temporal unitary transforms to generate 16-QAM up to 220 GBd using only 50-GHz electrical bandwidth. The technique is theoretically lossless and can generate arbitrary optic…
Spectro-temporal unitary transformations for coherent modulation: design trade-offs and practical considerations
Callum Deakin, Xi Chen
This paper analyzes the performance of spectro-temporal unitary transforms for coherent optical modulation. Unlike conventional IQ modulation, such transforms are based on a cascad…
314-GBaud Single-Wavelength Signaling Generated All-Electronically by a 158-GHz Digital-Band-Interleaved DAC
Di Che, Callum Deakin, Xi Chen
We demonstrate an all-electronic generation of 314-GBaud PS 8-ASK signals by a 158-GHz digital-band-interleaved DAC. The signals drive a thin-film LiNbO3 modulator that achieves ov…
Performance limits of spectro-temporal unitary transformations for coherent modulation
Callum Deakin, Xi Chen
We analyse the performance limits of coherent modulation based on lossless unitary transformations, demonstrating that they can achieve high (30~dB) SINAD and outperform convent…
2.4-THz Bandwidth Optical Coherent Receiver Based on a Photonic Crystal Microcomb
Callum Deakin, Jizhao Zang, Xi Chen +5
We demonstrate a spectrally-sliced single-polarization optical coherent receiver with a record 2.4-THz bandwidth, using a 200-GHz tantalum pentoxide photonic crystal microring reso…