Second-harmonic generation and electro-optic modulation in thermally poled and unpoled twin-hole silica-glass optical fiber

Second-harmonic generation (SHG) and electro-optic (EO) modulation were studied on thermally poled twin-hole fiber. Metal electrode wires were inserted into the side holes. The typical poling condition was 2.5 kV, 300 °C, and 40 min. SHG was measured using a Q-switched Nd:YAG laser. The SH power did not depend on the applied forward or reverse voltages. SHG without poling was also measured, then the maximum power was about 1/18 that of the poled SHG. EO modulation was performed using a twin-hole fiber inserted to a fiber-optic Mach-Zehnder interferometer. An AC modulation voltage was applied to the electrodes together with a DC bias voltage. Without poling, the modulation output was obtained only when a DC bias voltage was applied simultaneously. After poling, a modulation output was obtained without any bias voltage, and for the forward DC bias the modulation output increased with the bias voltage. For the reverse DC bias the modulation output showed the minimum for a bias voltage. The origin of the second-order nonlinearities and the other effects in the above SHG and EO modulation are discussed considering charge layers.

[1]  L. Skuja Optically active oxygen-deficiency-related centers in amorphous silicon dioxide , 1998 .

[2]  Carbon dioxide laser-assisted poling of silicate-based optical fibers. , 2000, Optics letters.

[3]  M. Fokine,et al.  Integrated fiber Mach-Zehnder interferometer for electro-optic switching. , 2002, Optics letters.

[4]  K. Kurosawa,et al.  Identification of defects associated with second-order optical nonlinearity in thermally poled high-purity silica glasses , 2001 .

[5]  Mingde Zhang,et al.  Theoretical Study for Thermal/Electric Field Poling of Fused Silica , 2001 .

[6]  C Simonneau,et al.  Greater than 20%-efficient frequency doubling of 1532-nm nanosecond pulses in quasi-phase-matched germanosilicate optical fibers. , 1999, Optics letters.

[7]  V. Pruneri,et al.  Electric field poling of quasi-phase-matched optical fibers , 1997 .

[8]  E. Freysz,et al.  Experimental study of the origin of the second-order nonlinearities induced in thermally poled fused silica. , 1997, Optics letters.

[9]  T. Mizunami,et al.  Large second-order susceptibility generated in the cathodic face of silica by doping F− anions , 1999 .

[10]  A. Kudlinski,et al.  Modeling of the chi(2) susceptibility time-evolution in thermally poled fused silica. , 2005, Optics express.

[11]  Toru Mizunami,et al.  Second-order nonlinearity and phase matching in thermally poled twin-hole fiber , 2004, SPIE OPTO.

[12]  T. Mizunami,et al.  Second-harmonic generation from thermally-poled twin-hole silica-glass optical fiber and enhancement by quasi phase matching , 2008 .

[13]  Large electrooptic modulation in a thermally-poled germanosilicate fiber , 1995, IEEE Photonics Technology Letters.

[14]  N. Godbout,et al.  Measurement and calculation of electrostrictive effects in a twin-hole silica glass fiber , 2000 .

[15]  D. Carlson,et al.  Ion Depletion of Glass at a Blocking Anode: II, Properties of Ion‐Depleted Glasses , 1974 .

[16]  U. Osterberg,et al.  Electric field induced second harmonic generation in germanium doped silica planar waveguides , 1994 .

[17]  T. Mizunami,et al.  The thickness evolution of the second-order nonlinear layer in thermally poled fused silica , 2001 .

[18]  H. Guillet de Chatellus,et al.  Measurement of the third-order susceptibility of glasses by EFISH of femtosecond pulses. , 2001, Optics express.