Laser, LED module and specialty optical fiber manufacturer StockerYale Inc. of Salem, N.H., today announced that it has signed a two-year, sole-source supply agreement with Vancouver, British Columbia-based NxtPhase T&D, a maker of optical sensors and digital protection and recording solutions for the electric power industry. StockerYale will supply a series of specialty optical fibers and fiber-based components optimized for use with the NxtPhase NXCT, NXVT and NXVCT line of optical current and voltage sensors, which it said is a lighter weight, more environmentally sensitive, less volatile and more accurate alternative to conventional iron-core instrument transformers.