The present invention provides a glass packing tube for use in fabricating a microchannel plate. The glass tube has a plurality of flat inner surfaces and is used to form a boule including a plurality of optical fibers located in the tube and a plurality of support rods between the first optical fibers and the flat surfaces whereby the tube, fibers and rods are fused together with reduced glass flow.

 
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> Optical fiber coupler having a relaxed alignment tolerance

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