1. Benton, T. P., and Linnell, L. R., (1981). Unpublished work.
2. Improved two-wavelength demultiplexing InGaAsP photodetector
3. Campbell, J. C, Dentai, A. G., Holden, W. S., and Rasper, B. L. (1983). Tech. Dig–Int. Electron Devices Meet., p. 464.
4. Carter, A. C, Ure, J., Harding, M., and Goodfellow, R. C, (1982). Unpublished work.
5. Conradi, J., Kim, H. B., Duck, G., Maciejko, R., Straus, J., and SpringThorpe, A. J. (1982). Tech. Dig., Top. Meet. Opt. Fiber Commun., 5th 1982, Paper TUFF7.