Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-09-27
1998-10-20
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
357123, 357138, 285 11, 285 24, H04J 1402, H04J 1408
Patent
active
058255192
ABSTRACT:
An optical demultiplexer includes a first optical path that includes a first nonlinear optical element (NLE) which responds to a control pulse to induce a 180.degree. phase shift in an optical data signal propagating therethrough. The NLE responds rapidly to the control pulse but slowly reverts to a non-phase shift state. A second optical path is provided which includes a second NLE. An optical output coupler is connected to the first and second optical paths and responds to in-phase data pulses therefrom to output a data pulse on a first output. The optical output coupler is responsive to 180.degree. phase shifted data pulses to output a corresponding data pulse on a second output. An input data source concurrently couples a train of optical data pulses of wavelength .lambda. onto the first optical path and the second optical path. A control input induces a first control pulse of wavelength .lambda. onto the first optical path and a second control pulse of wavelength .lambda. onto the second optical path, the second control pulse delayed a time t from the first control pulse, whereby a data pulse occurring during time t, is phase delayed by 180 degrees by the first NLE but is not affected by an additional phase delay in the second NLE during time t.
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Appl. Phys. Lett., 65 (3), 18 Jul. 1994, pp. 283-285, S. Nakamura et al., "Experimental investigation on high-speed switching characteristics of a novel symmetric Mach-Zehnder all-optical switch".
Appl. Phys. Lett., 67 (5), 31 Jul. 1995, pp. 605-607, K. I. Kang et al., "Demonstration of ultrafast, all-optical, low control energy, single wavelength, polarization independent, cascadable, and integratable switch" .
Bacares Rafael
Princeton University
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