An in-line, single-mode fiber-optic spectrometer is described and analyzed. Its key element is a photoresist grating placed in the evanescent field near the core on a side-polished fiber. Fabrication and nearly diffraction-limited performance (resolution Δλ ≈ 1 nm) are reported, and means are proposed to increase the resolution by several orders of magnitude.
© 1985 Optical Society of America
Original Manuscript: December 31, 1984
Manuscript Accepted: March 28, 1985
Published: June 1, 1985
P. St. J. Russell and R. Ulrich, "Grating–fiber coupler as a high-resolution spectrometer," Opt. Lett. 10, 291-293 (1985)