Optical switching by saturation-induced phase changes in an active directional coupler

Liu, J. M.; Yeh, C.
June 1987
Applied Physics Letters;6/8/1987, Vol. 50 Issue 23, p1625
Academic Journal
The refractive index in a traveling-wave semiconductor waveguide amplifier changes with light injection at intensities close to the saturation intensity due to light-induced changes in the carrier density. The saturation-induced optical switching in an active directional coupler switch based on this effect is investigated. The system can switch from a cross state at a low input power to a bar state at a high input power. This device may be used as a power-limiting directional coupler switch with gain in a local area network.


Related Articles

  • Neodymium doped sol-gel tapered waveguide amplifier. Peled, Asher; Nathan, Menachem; Tsukernik, Alexander; Ruschin, Shlomo // Applied Physics Letters;4/16/2007, Vol. 90 Issue 16, p161125 

    The authors report the design, fabrication, and study of a fully monolithic solid-state amplifier based on a neodymium doped sol-gel tapered rib waveguide with a thin guiding layer of 360 nm. Signal (1064 nm) and pump (803 nm) light were coupled into and out of the amplifier by grating couplers....

  • Effect of crystal phases on refractive index profiles of annealed proton-exchanged waveguides in X-cut LiTaO[sub 3]. Maring, D. B.; Tavlykaev, R. F.; Ramaswamy, R. V.; Korkishko, Yu. N.; Fedorov, V. A.; Zavada, J. M. // Applied Physics Letters;7/27/1998, Vol. 73 Issue 4 

    A complete structural phase diagram of annealed proton-exchanged X-cut LiTaO[sub 3] is presented, to relate refractive index change to proton-induced lattice deformation. From this diagram, explanations for the previously observed phenomena of index increase upon annealing and index decrease...

  • A dual-band branch line coupler based on Pi-shaped coupled lines. Katakam, Sri; Ren, Han; Shao, Jin; Zhou, Mi; Arigong, Bayaner; Ding, Jun; Zhang, Hualiang // Microwave & Optical Technology Letters;Feb2015, Vol. 57 Issue 2, p501 

    ABSTRACT This article presents a coupler using Pi-shaped coupled lines for dual-band operations. In this design, two open circuited stubs are tapped at both ends of a coupled line structure to realize the 90° phase changes at two frequencies. The designed structure is used in place of a...

  • Bistability and switching in nonlinear prism coupling. Stegeman, G. I.; Assanto, G.; Zanoni, R.; Seaton, C. T.; Garmire, E.; Maradudin, A. A.; Reinisch, R.; Vitrant, G. // Applied Physics Letters;3/14/1988, Vol. 52 Issue 11, p869 

    We demonstrate that when a nonlinear coupler is operated in the switching regime, small amounts of either nonlocality in the optically induced refractive index change or of longitudinal feedback can lead to optical bistability. Outside the switching regime, there is a threshold for the amount of...

  • Optical study of H2O ice to 120 GPa: Dielectric function, molecular polarizability, and equation of state. Chang-Sheng Zha; Hemley, Russell J.; Gramsch, Stephen A.; Ho-Kwang Mao; Bassett, William A. // Journal of Chemical Physics;2/21/2007, Vol. 126 Issue 7, p074506 

    The refractive index of H2O ice has been measured to 120 GPa at room temperature using reflectivity methods. The refractive index increases significantly with pressure on initial compression and exhibits small changes with pressure at previously identified phase transitions. Pressure...

  • Calculation of Refractive Indices for the (NH[sub 2]CH[sub 2]COOH)[sub 2] · HNO[sub 3] Crystal. Andriyevsky, B. // Optics & Spectroscopy;Jul2003, Vol. 95 Issue 1, p92 

    The refractionR of the diglycine nitrate (DGN) crystal, (NH[SUB2]CH[SUB2]COOH)[SUB2] · HNO[SUB3], in the para- and ferroelectric phases has been calculated in the model of noninteracting diatomic chemical bonds of the elementary unit cell of the crystal on the basis of the longitudinal and...

  • Baric changes in refractive indices of K2ZnCl4 crystals. Stadnyk, V. Yo.; Romanyuk, M. O.; Andrievsky, B. V.; Kogut, Z. O. // Optics & Spectroscopy;May2010, Vol. 108 Issue 5, p753 

    The influence of uniaxial pressure applied along the principal crystallophysical directions on the dispersion and temperature dependences of the refractive indices n i of K2ZnCl4 crystals has been investigated. The n i values are found to be fairly sensitive to uniaxial pressure, whereas an...

  • Dynamic non-reciprocal meta-surfaces with arbitrary phase reconfigurability based on photonic transition in meta-atoms. Yu Shi; Shanhui Fan // Applied Physics Letters;2016, Vol. 108 Issue 2, p1 

    We introduce a distinct class of dynamic non-reciprocal meta-surfaces with arbitrary phasereconfigurability. This meta-surface consists of an array of meta-atoms, each of which is subject to temporal refractive index modulation, which induces photonic transitions between the states of the...

  • High-precision refractive index measurements revealing order parameter fluctuations in KMnF3 and NiO. Schäfer, F. J.; Kleemann, W. // Journal of Applied Physics;4/1/1985, Vol. 57 Issue 7, p2606 

    Focuses on a study which discussed the measurement of the temperature dependence of the refractive index of cubic crystals undergoing phase transitions. Impact of the fluctuation-dissipation theorem on the fluctuation tail of the optical refractive index; Description of the interferometer for...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics