Free Space Light Measurement Jig Selection and Setup

When using an optical spectrum analyzer (OSA) to measure light propagating in free space, and because the input to an OSA is typically via a fiber optic connection, an adaptive fixture is often required.* This fixture, more commonly referred to as a jig, enables coupling of the light into an optical fiber. This application note introduces free space light measurement jigs as a recommendation for measuring the emission spectrum of a light source that propagates in free space or the optical transmission spectrum of an optical filter. It describes four types of jigs for light sources and one type for filters.

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