Optical waveguides – Directional optical modulation within an optical waveguide – Light intensity dependent
Patent
1993-01-11
1994-02-15
Ullah, Akm E.
Optical waveguides
Directional optical modulation within an optical waveguide
Light intensity dependent
385129, G02B 602
Patent
active
052874214
ABSTRACT:
All-optical modulation occurs in crystalline organic semiconductor waveguides (10a) grown by the ultrahigh vacuum process of organic molecular-beam deposition onto substrates (10b). Two light beams with wavelengths of 1.06 and 0.514 .mu.m from a first source (12) and a second source (34), respectively, may be used as the guided and the pump light sources, respectively. A resonant non-linear coefficient at room temperature of 5.4.times.10.sup.-5 cm.sup.2 /W at 1.06 .mu.occurs at a pump intensity of 1.0 W/cm.sup.2. This large non-linear effect is attributed to free electron-hole pairs produced by the dissociation of excitons generated by the short wavelength beam. A carrier lifetime of (17.+-.1) us, which determines the modulator switching time, is in good agreement with theoretical predictions. This appears to be the first observation of free-carrier-induced index modulation in crystalline organic waveguides.
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Forrest Stephen R.
Zang De Yu
Ullah Akm E.
University of Southern California
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