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Phase-locked arrays of buried-ridge InP/InGaAsP diode lasers

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4 Author(s)
Kapon, E. ; Bellcore, Red Bank, NJ, USA ; Rav-Noy, Z. ; Margalit, S. ; Yariv, A.

Phased-locked arrays of buried-ridge InP/InGaAsP diode lasers, emitting at 1.3 μm, were investigated both theoretically and experimentally. These arrays consist of index-guided buried-ridge lasers which are coupled via their evanescent optical fields. The field patterns and the modal gains of the array supermodes were calculated by using a simple waveguide model. The theoretical results show that buried-ridge arrays can be designed such that only the fundamental supermode is excited. In that case, the array lasers are coupled in-phase, which yields single-lobed, diffraction limited far-field patterns. The buried-ridge InP/InGaAsP arrays were grown by liquid phase epitaxy. These arrays exhibited single-lobed beams less than 4° in width up to more than twice the threshold current. Comparison of the measured field patterns and the calculated ones indicated that these arrays oscillated mainly in the fundamental supermode.

Published in:

Lightwave Technology, Journal of  (Volume:4 ,  Issue: 7 )

Date of Publication:

Jul 1986

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