Title :
Enhancement of contrast ratio in pattern edge extraction by using voltage-controlled negative load resistors
Author :
Hara, Kunihiko ; Kojima, Keisuke ; Mitsunaga, Kazumasa ; Kyuma, Kazuo
Author_Institution :
Mitsubishi Electr. Corp., Hyogo, Japan
Abstract :
Parallel-connected pn-pn optical switches can be used to realize pattern edge extraction. The authors describe a method of enhancing the on-edge/off-edge contrast ratio using voltage-controlled negative load resistors. Negative resistance can suppress the currents injected into the off-edge elements. In an experiment with the negative resistors based on serial-connected thyristors, a contrast ratio as high as 16:1 was obtained.<>
Keywords :
integrated optoelectronics; negative resistance; optical switches; pattern recognition; semiconductor switches; thyristor applications; contrast ratio; injected current suppression; integrated optics; on-edge/off-edge contrast ratio; parallel-connected switches; pattern edge extraction; pattern recognition; pn-pn optical switches; serial-connected thyristors; voltage-controlled negative load resistors; Circuits; Cities and towns; Data mining; Optical fibers; Optical interconnections; Optical switches; Optical waveguides; Resistors; Spontaneous emission; Voltage;
Journal_Title :
Photonics Technology Letters, IEEE
