Figure 1: Comparison of various compact and bench-top spectrometers.
From: High-resolution optical spectroscopy using multimode interference in a compact tapered fibre
Various metrics can be used to compare compact spectrometers, two of which—the fractional bandwidth, B and resolving power, R—are compared in this figure. For the purpose of comparison, we also include five commercial bench-top spectrometers (green): optical spectrum analysers (OSA), a stimulated Brillouin scattering spectrometer, an Echelle spectrometer and a single-grating spectrometer (note that multi-grating spectrometers can have wider operating bandwidth). Shown in blue are some of the recently developed compact spectrometers. The TFMMI spectrometer (red) that is introduced in this work achieves a resolving power of R>104 (R>105) in the visible (near-infrared) spectrum, and bandwidth B∼1. AWG, arrayed waveguide grating, FT, Fourier transform spectrometer.
