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We propose and experimentally demonstrate a fiber spectrum analyzer based ona planar waveguide chip butt-coupled with an input fiber and aligned to astandard camera without any free-space optical elements. The chip consists of asingle-mode waveguide to connect with the fiber, a beam broadening area, and awaveguide array in which the lengths of the waveguides are designed for bothwavelength separation and beam focusing. The facet of the chip is diced open sothat the outputs of the array form a near-field emitter. The far field arecalculated by the Rayleigh-Sommerfeld diffraction integral. We show that thechip can provide a focal depth on the millimeter scale, allowing relaxedalignment to the camera without any fine-positioning stage. Two devices with120 and 220 waveguides are fabricated on the polymer waveguide platform. Themeasured spectral width are 0.63 nm and 0.42 nm, respectively. This simple andpractical approach may lead to the development of a spectrum analyzer for fiberthat is easily mountable to any commercial camera, thereby avoiding thecomplication for customized detectors as well as electronic circuitsafterwards.

Fiber spectrum analyzer based on planar waveguide array aligned to a camera without lens