Bragg Soliton Compression and Fission on CMOS‐Compatible Ultra‐Silicon‐Rich Nitride. Issue 8 (2nd July 2019)

• Record Type: Journal Article
• Authors: Sahin, Ezgi; Blanco‐Redondo, Andrea; Xing, Peng; Ng, Doris K. T.; Png, Ching E.; Tan, Dawn T. H.; Eggleton, Benjamin J.
• Is Part Of: Laser & photonics reviews. Volume 13:Issue 8(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-07-02
• Subjects: Bragg gratings -- Bragg soliton fission -- integrated optics devices -- nonlinear optics -- optical solitons -- silicon‐rich nitride -- ultrafast optics; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.201900114
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: Higher‐order soliton dynamics, specifically soliton compression and fission, underpin crucial applications in ultrafast optics, communications, and signal processing. Bragg solitons exploit the strong dispersive properties of periodic media near the photonic band edge. This enables soliton dynamics to occur in very short propagation distances, opening avenues to harness soliton compression and fission in integrated photonic platforms. However, implementation in complementary metal‐oxide semiconductor (CMOS)‐compatible platforms has been hindered by the strong nonlinear loss that dominates the propagation in silicon and the low‐optical nonlinearity of traditional silicon nitride. Here, CMOS‐compatible, on‐chip Bragg solitons, are presented with a soliton‐effect pulse compression with a factor of × 5.7, along with time‐resolved measurements of soliton fission on a CMOS‐compatible photonic circuit platform. These observations are enabled by the combination of a unique cladding‐modulated Bragg grating design and the high nonlinearity and negligible nonlinear loss of compositionally engineered ultra‐silicon‐rich nitride (USRN: Si7 N3 ). Abstract : Bragg soliton dynamics are demonstrated on ultra‐silicon‐rich nitride (USRN) platform. The combination of a novel, on‐chip cladding‐modulated Bragg grating design and a highly nonlinear, back‐end complementary metal‐oxide semiconductor (CMOS)‐compatible USRN platform enables a pulse compression factor of × 5.7, leading to the generation of sub‐picosecond pulses. Full time‐resolved measurements of soliton fission are presented.