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A second-order diffraction grating placed below the active region of a phase-locked resonant antiguided array selects the in-phase array mode in addition to its role as a single-longitudinal-mode selector. This type of array-mode discrimination relies on the fact that the resonant in-phase array mode has significantly better field overlap with the grating(More)
A computer programme is described which can undertake automatic distribution of patients referred for elective surgery. The programme ensures coordinated reservation of operation and bed resources. The programme provides copies of admission and operation lists to the departments concerned and, similarly, it writes out distribution lists and summoning(More)
Two new techniques for the fabrication of fiber gratings with a narrowband filter response are reported. In the first technique, the reflection bandwidth is reduced by increasing the grating length. Fiber gratings 10 mm long have been made with a bandwidth of 0.3 nm. In the second technique, a phase shift is incorporated into the grating to form a resonant(More)
The group index for TE modes in an asymmetrical slab waveguide is investigated, and a simple analytical expression is derived. It is shown that the product of the phase and group indices is related to the power fraction in each of the three layers of the waveguide. The results are of interest in the analysis of double heterostructure semiconductor(More)
An analysis of the threshold current for double-heterostructure GaInAsP lasers is presented. The analysis is based on a simple expression for the gain-current relation and includes the effect of optical confinement. Using a refractive- index model for GaInAsP compounds, lasers emitting at 1.55 microm are investigated. Asymmetrical structures, i.e., lasers(More)