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All-Optical Logic Circuits Based on the Polarization Properties of Non-Degenerate Four-Wave Mixing


Bhardwaj, Ashish Ishwar Singh (2001) All-Optical Logic Circuits Based on the Polarization Properties of Non-Degenerate Four-Wave Mixing. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/CMAB-WF06.


This thesis investigates a new class of all-optical logic circuits that are based on the polarization properties of non-degenerate Four-Wave Mixing. Such circuits would be used in conjunction with a data modulation format where the information is coded on the states of polarization of the electric field. Schemes to perform multiple triple-product logic functions are discussed and it is shown that higher-level Boolean operations involving several bits can be implemented without resorting to the standard 2-input gates that are based on some form of switching. Instead, an entire hierarchy of more complex Boolean functions can be derived based on the selection rules of multi-photon scattering processes that can form a new class of primitive building blocks for digital circuits.

Possible applications of these circuits could involve some front-end signal processing to be performed all-optically in shared computer back-planes. As a simple illustration of this idea, a circuit performing error correction on a (3,1) Hamming Code is demonstrated. Error-free performance (Bit Error Rate of < 10⁻⁹) at 2.5 Gbit/s is achieved after single-error correction on the Hamming word with 50 percent errors. The bit-rate is only limited by the bandwidth of available resources. Since Four-Wave Mixing is an ultrafast nonlinearity, these circuits offer the potential of computing at several terabits per second. Furthermore, it is shown that several Boolean functions can be performed in parallel in the same set of devices using different multi-photon scattering processes. The main objective of this thesis is to motivate a new paradigm of thought in digital circuit design. Challenges pertaining to the feasibility of these ideas are discussed.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:all-optical signal processing; fiber-optic communications; four-wave mixing; semiconductor optical amplifiers
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Vahala, Kerry J.
Thesis Committee:
  • Vahala, Kerry J. (chair)
  • Fultz, Brent T.
  • Rutledge, David B.
  • Atwater, Harry Albert
  • Bridges, William B.
Defense Date:18 May 2001
Non-Caltech Author Email:ashishb (AT)
Record Number:CaltechETD:etd-07132001-112041
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2866
Deposited By: Imported from ETD-db
Deposited On:13 Jul 2001
Last Modified:01 Dec 2022 22:59

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