Abstract: An aluminosilicate glass having a composition according to the following formula (I): (100?(1+a1+b1)·x)SiO2·(x)Al2O3·(a1·x)MO·(b1·x)R (wt %)??(I) in which MO is alkaline earth metal oxide, the alkaline earth metal M being one or more of Mg, Ca, Sr, and Ba, R comprises alkali metal oxide, the alkali metal being one or more of Li, Na, and K, x is at least 15, a1 is at least 0.35, b1 is at least 0.55, and wherein the product of a1 and b1 is at least 0.22.

Abstract: An optical signal transmission system comprising a multimode optical fiber link. The multimode optical fiber link is for transmission of a plurality of optical signals in a plurality of spatial modes supported by the multimode optical fiber link. The optical signal transmission system comprises a photonic device in the form of a spatial mode add drop multiplexer coupled to the multimode optical fiber link and configured for at least one of coupling into the multimode optical fiber link an optical signal of the plurality of optical signals into a spatial mode of the plurality of spatial modes and coupling out of the multimode optical fiber link and into an optical fiber the optical signal of the spatial mode.

Abstract: A system for detecting the installation of an optical tap on an optical fiber link. The system comprises a spatial mode de-multiplexer optically coupled to the optical fiber link. The spatial mode de-multiplexer is configured to isolate an optical signal in a first spatial mode of the optical fiber link. The spatial mode de-multiplexer is configured to isolate light in a second spatial mode of the optical fiber link 14. The system comprises an optical sensor optically coupled to the spatial mode de-multiplexer for measuring the optical power of the light in the second spatial mode of the optical fiber link. Also disclosed herein are methods for detecting installation of an optical tap and methods for securing an optical signal in an optical fiber.

Abstract: An optical signal transmission system comprising a multimode optical fiber link. The multimode optical fiber link is for transmission of a plurality of optical signals in a plurality of spatial modes supported by the multimode optical fiber link. The optical signal transmission system comprises a photonic device in the form of a spatial mode add drop multiplexer coupled to the multimode optical fiber link and configured for at least one of coupling into the multimode optical fiber link an optical signal of the plurality of optical signals into a spatial mode of the plurality of spatial modes and coupling out of the multimode optical fiber link and into an optical fiber the optical signal of the spatial mode.

Abstract: An element for the amplification of a light by stimulated emission of radiation and a method of making the same is described herein.

Abstract: An element for the amplification of a light by stimulated emission of radiation and a method of making the same is described herein.

Abstract: A process of making a microstructure, is described. The process comprises the steps of forming a plurality of fillable features in a first material, to form a template; and applying a second material to the template so that the second material at least partially fills at least some of the fillable features in the template so as to form the microstructure, said second material being different from the first material. The process of forming a template uses a laser selected from a picosecond laser, a femtosecond laser and a nanosecond UV laser. The invention includes a photonic crytal made by this process.