Generation of High Repetition Rate Picosecond Pulse Train Based on Ultra-Small Silicon Waveguide

Abstract

Abstract-A designed model based on the ultra-small silicon waveguide(WG) is demonstrated to generate high repetition rate picosecond pulse train. Research result shows that 50 GHz repetition rate pulse can be obtained inside a 2-mm-long ultra-small silicon WG using signal wave at 1550 nm with a cw power of 0.2 mW and different delay modulation Gaussian pulses at 1670 nm with peak of 0.6 mW before the WG. the signal pulse train obtained has duration time as short as around 6 ps full width of half maximum(FWHM) and extinction ratio as large as up to 30 dB. Additionally, each pulse of signal pulse train obtained holds equal intensity and close Gaussian waveform.

Generation of ultrafast pulse via combined effects of stimulated Raman scattering and non-degenerate two-photon absorption in silicon nanophotonic chip

“…In particular, the nonlinear phenomenon from SRS is ∼10 4 times larger compared to the standard single mode glass fibre so that effective Raman gain level can be achieved using silicon waveguides of several millimetres or centimetres. To this day, some significant investigations, such as Raman laser [5], amplification [6], wavelength conversion [7], pulse train generation [8], logic gate [9], filter [10], etc., have been performed based on SOI straight waveguides and ring resonators. In addition, the nonlinear process, such as non-degenerate TPA, will also play an important role for signal propagation, which has already been applied in the all-optical modulation and pulse shaping [11,12].…”

Raman Amplification and Superluminal Propagation of Ultrafast Pulses Based on Loop Silicon Waveguides: Theoretical Modeling and Performance

“…As a transmission medium, SOI has much higher nonlinear effects than the commonly used silicon dioxide, and can confine the optical field to an area that is approximately 100 times smaller than modal area in a standard single mode optical fiber owing to high index contrast ratio between the core and cladding. In particular, the gain coefficient for Stimulated Raman Scattering (SRS) is approximately 10 4 times higher in silicon than in silica so that it is possible to produce light emission and amplification from SRS in SOI waveguides [4][5][6][7][8][9][10]. Another attractive issue is that the superluminal optical pulse propagation can be achieved in anomalously dispersive silicon waveguides for ultrafast femtosecond pulses.…”

Microwave/Millimeter-Wave Generation Using Multi-Wavelength Photonic Crystal Fiber Brillouin Laser

“…Heterodyning the outputs from two coherent oscillating continuous-wave lasers is one of the most advantageous techniques [10], it has high efficiency and the frequency range that can be generated is only limited by the bandwidth of the photodetector. A high repetition rate picosecond pulse train is implemented in [11]. Several different hererodyning techniques for microwave/millimeter-wave generation have been reported using single-frequency laser with Mach-Zehnder-based multiplying or multiwavelength laser [12][13][14].…”