Laser modelocking and dual wavelength lasing in silicon

Nonlinear optics in silicon has drawn substantial attention in the recent years. In this research, laser mode-locking and dual wavelength lasing are achieved in a fiber-ring-cavity using an Erbium-doped fiber amplifier (EDFA) as a gain medium and a 1.7cm long silicon-on-insular waveguide as pulse compressor, a mode-locker and a Raman gain media. We show that the transient behavior of two photon absorption (TPA) and TPA induced free carrier absorption can be used for pulse compression and laser modelocking in the silicon waveguide inside the laser cavity. The proposed technique takes advantage of spontaneous generation of free carriers and the slow recombination time, >17ns, to attenuate the trailing edge of the time varying signals passing through the waveguide. When a 5μm2 model area silicon waveguide is placed inside a fiber ring cavity consisting of an EDFA as a gain media and ~50ps modelocked laser pulses are generated at 1540nm. We also observe that the generated short pulses also induce stimulated Raman scattering at 1675nm in the same silicon waveguide. We show that engineering the laser cavity facilitates laser modelocking and dual wavelength laser oscillation at 1540nm and 1675nm. Experimentally we obtain <100ps modelocked pulses at both wavelengths. The average pump threshold power of the Raman laser is measured to be 3.75mW and the Stokes average output power is measured to be 3 μW.

[1]  Xinzhu Sang,et al.  Dual-Wavelength Mode-Locked Fiber Laser With an Intracavity Silicon Waveguide , 2008, IEEE Photonics Technology Letters.

[2]  A. Cuevas,et al.  General parameterization of Auger recombination in crystalline silicon , 2002 .

[3]  O. Boyraz,et al.  Pulse Compression and Modelocking by Using TPA in Silicon Waveguides , 2007, 2007 Conference on Lasers and Electro-Optics (CLEO).

[4]  Alexander Fang,et al.  An all-silicon Raman laser , 2005, Nature.

[5]  T. Shoji,et al.  All-optical efficient wavelength conversion using silicon photonic wire waveguide , 2006, IEEE Photonics Technology Letters.

[6]  Hon Ki Tsang,et al.  Silicon waveguide two-photon absorption detector at 1.5 μm wavelength for autocorrelation measurements , 2002 .

[7]  Bahram Jalali,et al.  Demonstration of 11dB fiber-to-fiber gain in a silicon Raman amplifier , 2004, IEICE Electron. Express.

[8]  Bahram Jalali,et al.  All optical switching and continuum generation in silicon waveguides. , 2004, Optics express.

[9]  M. Lipson,et al.  All-optical control of light on a silicon chip , 2004, Nature.

[10]  T Kawanishi,et al.  Ultrafast all-optical switching by cross-absorption modulation in silicon wire waveguides. , 2005, Optics express.

[11]  M. Paniccia,et al.  A high-speed silicon optical modulator based on a metal–oxide–semiconductor capacitor , 2004, Nature.

[12]  Nahum Izhaky,et al.  High-speed optical modulation based on carrier depletion in a silicon waveguide. , 2007, Optics express.

[13]  Michal Lipson,et al.  All-optical slow-light on a photonic chip. , 2006, Optics express.

[14]  Bahram Jalali,et al.  Demonstration of a silicon Raman laser. , 2004, Optics express.

[15]  F. Xia,et al.  Ultracompact optical buffers on a silicon chip , 2007 .

[16]  Michal Lipson,et al.  All-optical switching on a silicon chip. , 2004, Optics letters.

[17]  Ansheng Liu,et al.  Optical amplification and lasing by stimulated Raman scattering in silicon waveguides , 2006, Journal of Lightwave Technology.

[18]  B. Jalali,et al.  Parametric Raman wavelength conversion in scaled silicon waveguides , 2005, Journal of Lightwave Technology.

[19]  En-Kuang Tien,et al.  Influence of nonlinear loss competition on pulse compression and nonlinear optics in silicon , 2007 .

[20]  Sasan Fathpour,et al.  Energy harvesting in silicon wavelength converters. , 2006, Optics express.

[21]  M. Först,et al.  Ultrafast Kerr-induced all-optical wavelength conversion in silicon waveguides using 1.55 mum femtosecond pulses. , 2006, Optics express.