Miniaturized directional coupler—type optical switches

1989 ◽  
Vol 72 (3) ◽  
pp. 100-106 ◽  
Author(s):  
Makoto Minakata ◽  
Toshikazu Sakano ◽  
Shojiro Kawakami
Keyword(s):  
Directional Coupler ◽  
Optical Switches

All-Optical Switches and All-Optical Bistability by Nonlinear Optical Materials

1992 ◽  
Vol 247 ◽  
Author(s):  
K. Sasaki ◽  
S. Sasaki ◽  
O. Furukawa
Keyword(s):  
Optical Materials ◽  
High Speed ◽  
Optical Bistability ◽  
Directional Coupler ◽  
Basic Structure ◽  
Optical Switches ◽  
All Optical ◽  
Coupling Parameters ◽  
Layered Waveguide ◽  
High Speed Switching

ABSTRACTAll-optical switches and all-optical bistabili ties are realized by waveguide structures with vacuum evaporated polydiacetylene(PDA) films. The basic structure of the all-optical switches are prepared in the form of layered waveguide directional coupler with vacuum evaporated PDA top layer. Clearly switchings are observed at 1064nm of pulsed Nd:YAG laser. Furthermore ultra-high speed switching with Ti;Safire 135fs laser are recognized.Operations of all-optical bistabilities are carried out by nonlinear coupling at grating structures in waveguides with PDA top layers. Hysterisis curves of bistability are affected by coupling parameters of gratings and parameters of waveguides.

Switching characteristics of GaAs directional coupler optical switches

1986 ◽  
Vol 25 (9) ◽  
pp. 1484 ◽  
Author(s):  
Hiroaki Inoue ◽  
Kenji Hiruma ◽  
Koji Ishida ◽  
Hitoshi Sato ◽  
Hiroyoshi Matsumura
Keyword(s):  
Directional Coupler ◽  
Optical Switches ◽  
Switching Characteristics

scholarly journals Investigations and Simulations of All optical Switches in linear state Based on Photonic Crystal Directional Coupler

2014 ◽  
Vol 3 (1) ◽  
pp. 66 ◽  
Author(s):  
S. Maktoobi ◽  
R. Ghayour
Keyword(s):  
Signal Processing ◽  
Photonic Crystal ◽  
Optical Switching ◽  
Directional Coupler ◽  
Optical Signal ◽  
Optical Switches ◽  
Crystal Lattices ◽  
All Optical ◽  
Signal Processing Systems ◽  
Linear State

Switching is a principle process in digital computers and signal processing systems. The growth of optical signal processing systems, draws particular attention to design of ultra-fast optical switches. In this paper, All Optical Switches in linear state Based On photonic crystal Directional coupler is analyzed and simulated. Among different methods, the finite difference time domain method (FDTD) is a preferable method and is used. We have studied the application of photonic crystal lattices, the physics of optical switching and photonic crystal Directional coupler. In this paper, Electric field intensity and the power output that are two factors to improve the switching performance and the device efficiency are investigated and simulated. All simulations are performed by COMSOL software.

Structured methods for improving flow measurement accuracy in pipelines

2020 ◽  
pp. 30-35
Author(s):  
Gurami N. Akhobadze
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Directional Coupler ◽  
Signal To Noise Ratio ◽  
Scattered Wave ◽  
Orthogonal Polarization ◽  
Flow Sensors ◽  
Information Signal ◽  
Mass Flows ◽  
Processing Device

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

RESEARCH INTO MIRRORS SURFACE REFLECTIVITY FOR MEMS OPTICAL SWITCHES

2012 ◽  
Vol 71 (16) ◽  
pp. 1495-1502
Author(s):  
A. I. Filipenko ◽  
E.L. Dyachenko ◽  
V.N. Kazimirova
Keyword(s):  
Optical Switches ◽  
Surface Reflectivity
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