Nature 325, 27 - 31 (01 January 1987); doi:10.1038/325027a0

The demonstration of restoring digital optical logic

S. D. Smith, A. C. Walker, F. A. P. Tooley & B. S. Wherrett

Department of Physics, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK

Nonlinear all-optical circuit elements can be used to create indefinitely extensible optical logic. By the use of a 'lock and clock' architecture and an off-axis configuration of the power and signal beams, signal corruption can be avoided and standardized signal levels through cascaded devices maintained. Several loop circuits have been operated to demonstrate a simple 'optical classical finite state machine'.

References

1.	Walker, A. C., Tooley, F. A. P., Prise, M. E., Mathew, J. G. H., Kar, A. K., Taghizadeh, M. R. & Smith, S. D. Phil. Trans. R. Soc. A313, 249−256 (1984).
2.	Smith, S. D., Mathew, J. G. H., Taghizadeh, M. R., Walker, A. C., Wherrett, B. S. & Hendry, A. Optics Commun. 51, 357−362 (1984). | Article | ChemPort |
3.	Smith, S. D. Nature 316, 319−324 (1985). | Article | ISI |
4.	Walker, A. C. Appl. Opt. 25, 1575−1585 (1986).
5.	Wherrett, B. S. Appl. Opt. 24, 2876−2833 (1985). | ChemPort |
6.	Smith, S. D. et al. Opt. Engng 24, 569−574 (1985). | ChemPort |
7.	Mead, C. & Conway, C. An Introduction to VLSI Systems (Addison-Wesley, Reading, Massachusetts, 1980).
8.	Goodman, J. W. Proc. Inst. Radio Engnrs 65, 29−32 (1977).
9.	Lohman, A. W. Optical Bistability III (eds Gibbs, H. M., Smith, S. D., Mandel, P. & Peyghambarian, N.) 2−3 (Springer, Berlin, 1986).
10.	Huang, A. Proc. Inst. Radio Engrs 72, 780−786 (1984).
11.	Abraham, E. & Halley, J. M. Appl. Phys. A (in the press).
12.	Bigot, J. Y., Daunois, A., Leonelli, R., Sence, M., Mathew, J. G. H., Smith, S. D. & Walker, A. C. Appl. Phys. Lett. 49, 844−846 (1986). | Article | ChemPort |
13.	Wherrett, B. S., Hutchings, D. & Russell, D. J. opt. Soc. Am. B 3, 351−362 (1986). | ChemPort |
14.	Janossy, I., Mathew, J. G. H., Abraham, E., Taghizadeh, M. R. & Smith, S. D. IEEE J. Quantum Electron. (in the press).
15.	Mathew, J. G. H., Taghizadeh, M. R., Abraham, E., Janossy, I. & Smith, S. D. Optical Bistability III (eds Gibbs, H. M., Smith, S. D., Mandel, P. & Peyghambarian, N.) 57−60 (Springer, Berlin, 1986).
16.	Janossy, I., Taghizadeh, M. R., Mathew, J. G. H. & Smith, S. D. IEEE J. Quantum Electron. 21, 1447−1452 (1985). | Article |
17.	Walker, A. C. Optics Commun. 59, 145−150 (1986). | Article | ChemPort |
18.	Gibbs, H. M., Tarng, S. S., Jewell, J. L., Weinberger, D. A. & Tai, K. Appl. Phys. Lett. 41, 221−223 (1982). | Article | ISI | ChemPort |
19.	Ovadia, S., Gibbs, H. M., Jewell, J. L., Sarid, D. & Peyghambarian, N. Opt. Engy 24, 565−568 (1985). | ChemPort |
20.	Miller, D. A. B., Henry, J. E., Gossard, A. C. & English, J. H. Appl. Phys. Lett. 49, 821−823 (1986). | Article | ChemPort |
21.	Wherrett, B. S. in From Optical Bistability Towards Optical Computing (Proc. European Joint Optical Bistability Project) (eds Smith, S. D., Mandel, P. & Wherrett, B. S.) Ch. 5.7 (North Holland, Amsterdam, in the press).