A planar Rowland spectrometer was fabricated and characterized as a wavelength demultiplexer for multimode fiber-optic applications. The spectrometer consisted of a planar multimode glass waveguide with two curved end faces and a cylindrical concave grating attached to one of the end faces. Semiconductor lasers with wavelengths between 0.825 and 0.845 µm were used for the measurements. Cross-talk isolation between two adjacent fibers with center-to-center separation of 175 µm (100 Å in wavelength difference) was measured to be 18 dB. The device's performance was limited by grating diffraction efficiency, optical aberration , waveguide dispersion, and waveguide losses.
© 1981 Optical Society of America
H. W. Yen, H. R. Friedrich, R. J. Morrison, and G. L. Tangonan, "Planar Rowland spectrometer for fiber-optic wavelength demultiplexing," Opt. Lett. 6, 639-641 (1981)