J.A. Arnaud, F. A. Pelow

Bell System Technical Journal, 1975,  (Volume:54 ,  Issue: 2 ), 263 – 283

ABSTRACT

Experimental results are reported concerning the transmission, reflection, and depolarization of metal grids that reflect an upper band, centered at 30 GHz, and transmit a lower band, centered at 20 GHz. With a single grid, the transmission loss is less than 0.1 dB, and the rejection exceeds 44 dB. Depolarization is measured under realistic conditions with direct dual-mode feed excitation. In a 10-percent band, depolarization is below 34 dB at all scanning angles for both the transmitted and reflected waves. Experiments with two parallel resonant grids are also reported.

LIEN VERS  L’ARTICLE : RESONANT-GRID QUASI-OPTICAL DIPLEXERS

J. A. Arnaud

Electronic Letters, january 1975, vol 11, n°1

ABSTRACT

A closed-form expression is obtained for pulse broadening in graded-index fibres with k2(r)=1−r2+ε2r4+…+εnr2n. Pulse broadening for k2(r)=1−r2+0.615r4+70r6 and r<0.1 is 12 times smaller than for square-law fibres if material dispersion is neglected.

LIEN VERS  L’ARTICLE : PULSE BROADENING IN MULTIMODE GRADED-INDEX FIBRES