Four-channel integrated-optics coupler and frequency-channel multiplexer Lyndin, N. M. ; Sarkisov, Iu. N. ; Sychugov, V. A. ; Fedorov, Iu. F. ; Shipulo, G. P. ; Bezperstova, I. S. ; Palchun, T. V. Abstract Publication: Soviet Journal of Quantum Electronics Pub Date: January 1980 Bibcode: 1980SvJQE..10...75L