All-optical Transistors for Ultrafast Computing
Final rept. 1 Jun 1998-31 Jan 2001
CITY COLL NEW YORK DEPT OF ELECTRICAL ENGINEERING
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Information technology is aiming at higher speed, smaller dimensions, and better performance. Basic processes to produce all-optical transistors OT based on the novel polarization-controlled all-optical amplifier in non-birefringent single-mode optical fibers to modulate and amplify weak optical signals have been investigated. A weak signal passing into an OT will be amplified using an intense pump optical wave co-propagating in optical fibers. Using a non-birefringent single-mode optical fiber is better because the desired working optical power is much lower than that using a birefringent one because the natural birefringence in a birefringent fiber has to be canceled first by an intense optical wave. We have designed, assembled, and tested a single stage optical transistor based on the polarization controlled optical amplifier approach. Alternative nonlinear optical glasses and liquids with larger xexp 3 values than the reference CS2 gate at fast switching speed have been measured by four wave mixing, optical Kerr gate, and z-scan supported by other research grants. The optical nonlinearity and response time of several newly developed optical materials, such as a heavy element doped glass PbO-Bi2O3-Ga2O3, Tb3 doped fiber, a silica micro-structured fiber, and Cu doped ZnSe crystals have been studied.
- Electrooptical and Optoelectronic Devices