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We present designs of all-optical computing circuits, namely, half-fulladder/subtractor, de-multiplexer, multiplexer, and an arithmetic unit, based onbacteriorhodopsin (BR) protein coated microcavity switch in a treearchitecture. The basic all-optical switch consists of an input infrared (IR)laser beam at 1310 nm in a single mode fiber (SMF-28) switched by a controlpulsed laser beam at 532 nm, which triggers the change in the resonancecondition on a silica bead coated with BR between two tapered fibers. We showthat fast switching of 50 us can be achieved by injecting a blue laser beam at410 nm that helps in truncating the BR photocycle at the M intermediate state.Realization of all-optical switch with BR coated microcavity switch has beendone experimentally. Based on this basic switch configuration, designs ofall-optical higher computing circuits have been presented. The design requires2n-1 switches to realize n bit computation. The proposed designs require lessnumber of switches than terahertz optical asymmetric demultiplexer basedinterferometer designs. The combined advantages of high Q factor, tunability,compactness and low power control signals, with the flexibility of cascadingswitches to form circuits, makes the designs promising for practicalapplications. The design combines the exceptional sensitivities of BR andmicrocavities for realizing low power circuits and networks. The designs aregeneral and can be implemented (i) in both fiber-optic and integrated opticformats, (ii) with any other coated photosensitive material, or (iii) anexternally controlled microresonator switch.

All-Optical Arithmetic and Combinatorial Logic Circuits with High-Q Bacteriorhodopsin Coated Microcavities