Abstract: A grism based upon a grating with a given line frequency is configured such that a design wavelength will undergo either a specific total bend angle, a zero-degree total bend without lateral displacement, or a zero-degree total bend with a lateral displacement. Each configuration exhibits the same dispersion characteristics. Other design wavelengths, bend angles and displacements are possible through appropriate adjustment of grating frequency, prism geometry, and/or material(s). A specific design is disclosed using light with a +/?delta wavelength around a design wavelength of 795 nm. The invention may be used to disperse light at different wavelengths, including wavelengths associated with optical communications bands.

Abstract: Multiplexed grating and grating/prism devices are particularly suited to DWDM optical telecommunications networks, finding utility in optical spectrum analyzers (OSAs) and fiber multiplexer/demultiplexers. The invention may be used to address both single- and dual-band configurations through adjustment of the grating, detector array, and/or inclusion of a fiber-optic switch. As a dual-band OSA covering the C- and L-bands, a device according to the invention may be used to replace two separate OSAs like those currently in production, at only a modest increase in cost relative to a single-band OSA.

Abstract: Multiplexed grating and grating/prism devices are particularly suited to DWDM optical telecommunications networks, finding utility in optical spectrum analyzers (OSAs) and fiber multiplexer/demultiplexers. The invention may be used to address both single- and dual-band configurations through adjustment of the grating, detector array, and/or inclusion of a fiber-optic switch. As a dual-band OSA covering the C- and L-bands, a device according to the invention may be used to replace two separate OSAs like those currently in production, at only a modest increase in cost relative to a single-band OSA.