Octave-Spanning Dispersive Slot Waveguide Based Chip-Level Ultrashort Pulse Stretcher

IEEE Access

Changjing Bao¹  Yongxiong Ren¹  Hao Huang¹  Zhongqi Pan²  Yuxi Fang³  Yange Liu³  Si-Ao Li³  Yang Yue³  Zhi Wang³  Yiwen Zhang³  Lin Zhang⁴ 

[1] Department of Electrical Engineering, University of Southern California, Los Angeles, CA, USA;Department of Electrical and Computer Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA;Institute of Modern Optics, Nankai University, Tianjin, China;School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin, China;

关键词: Stretcher;    dispersion;    silicon photonics;    slot waveguide;    integrated optics;   

DOI  :  10.1109/ACCESS.2020.3024855

来源: DOAJ

【 摘 要 】

A silicon nitride horizontal slot waveguide with silicon dioxide cladding is designed to achieve flat negative dispersion (<; -600 ps/(nm · km)) over an octave-spanning bandwidth (782 to 2100 nm). Simulations show that, when a 10-fs pulse with 1-W peak power is input into a 5-cm long waveguide, the pulse width becomes 448 times wider and its peak power is reduced to 2.23×10^-3 W. After passing through another ideal positive dispersion element, we find that the output pulse peak power can be recompressed close to 1 W in the case of different input pulse widths. Moreover, for the input pulse with a much higher peak power, the pulse width of the output pulse can be compressed to a much narrower level because of the spectral broadening introduced by optical nonlinearity. A 100-fs input pulse with 10-kW peak power can be compressed to 12.5 fs with a peak power of 63 kW. Considering the time-domain broadening and the peak power reduction, such a slot waveguide with a flat negative dispersion could be used as a time stretcher for 10-fs level pulse in on-chip chirped pulse amplification (CPA) system.

【 授权许可】

Unknown