Sub-picosecond phase-sensitive optical pulse characterization on a chip

Pasquazi, Alessia, Peccianti, Marco, Park, Yongwoo, Little, Brent E, Chu, Sai T, Morandotti, Roberto, Azaña, José and Moss, David J (2011) Sub-picosecond phase-sensitive optical pulse characterization on a chip. Nature Photonics, 5 (10). pp. 618-623. ISSN 1749-4885

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he recent introduction of coherent optical communications has created a compelling need for ultrafast phase-sensitive measurement techniques operating at milliwatt peak power levels and in timescales ranging from sub-picoseconds to nanoseconds. Previous reports of ultrafast optical signal measurements in integrated platforms include time-lens temporal imaging on a silicon chip and waveguide-based frequency-resolved optical gating (FROG). Time-lens imaging is phase-insensitive, and waveguide-based FROG methods require the integration of long tunable delay lines, which is still an unsolved challenge. Here, we report a device capable of characterizing both the amplitude and phase of ultrafast optical pulses with the aid of a synchronized incoherently related clock pulse. It is based on a novel variation of spectral phase interferometry for direct electric-field reconstruction (SPIDER) that exploits degenerate four-wave mixing in a CMOS-compatible chip. We measure pulses with a peak power of <100 mW, a frequency bandwidth of >1 THz, and up to 100 ps pulsewidths, yielding a timeg-bandwidth product of >100.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501 Applied optics. Photonics
Depositing User: Alessia Pasquazi
Date Deposited: 19 Sep 2013 14:20
Last Modified: 02 Jul 2019 21:06

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