Improving Low-Dispersion Bandwidth of the Silicon Photonic Crystal Waveguides for Ultrafast Integrated Photonics

Jinghan Pan,Shaojie Yin,Meicheng Fu,Shuyue Zhu,Xiujian Li,Xiaochun Wang,Wenjun Yi,Jiali Liao,Mengjun Zhu,Ju Liu,Wusheng Tang,Xin Chen,Guocheng Huang,Heng Yang,Junli Qi

doi:10.3390/photonics8040105

Jinghan Pan, Shaojie Yin + Show 13 more

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https://doi.org/10.3390/photonics8040105

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We design a novel slow-light silicon photonic crystal waveguide which can operate over an extremely wide flat band for ultrafast integrated nonlinear photonics. By conveniently adjusting the radii and positions of the second air-holes rows, a flat slow-light low-dispersion band of 50 nm is achieved numerically. Such a slow-light photonic crystal waveguide with large flat low-dispersion wideband will pave the way for governing the femtosecond pulses in integrated nonlinear photonic platforms based on CMOS technology.

Highlights

With the capabilities in flexible designability, high integration and mature massproduction, the slow-light photonic crystal waveguide (PhCW) [1] has become a versatile element for many applications including integrated lasers [2], microwave photonics [3], optical communications and optical computing [4]
Due to its remarkable slow-light enhanced effects and flexible dispersion engineering properties under the roomtemperature condition, ultrafast nonlinear photonics within the slow-light region of PhCW has emerged as a hot topic recently, with many impressive works including front-induced transitions [5], pulse acceleration [6], pure-quartic solitons [7], pulse compression [8], ultrafast time delay tuning [9], slow-light-induced Doppler shift [10], optical auto-correlator [11] and dynamic control [12] having been demonstrated in PhCW
Several attempts had been made to design a suitable PhCW for various broadband applications, and the performance is usually evaluated by the normalized delay-bandwidth product (NDBP), which is defined as the product of group index (Ng) and normalized bandwidth

Summary

Introduction

With the capabilities in flexible designability, high integration and mature massproduction, the slow-light photonic crystal waveguide (PhCW) [1] has become a versatile element for many applications including integrated lasers [2], microwave photonics [3], optical communications and optical computing [4]. The inherent original small bandwidth, extremely large group velocity dispersion (GVD) and sophisticated linear and nonlinear loss properties distort the ultrashort pulse seriously, which limit the practical ultrafast utilization of slow-light PhCW.

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