High-performance, free-space ruled concave gratingdemultiplexer

Abstract

Near-diffraction-limited performance at 1.5 µm of a free-space concave ruled grating demultiplexer for densely-spaced wavelength routed networks is reported. Over the wavelength range of 16 nm (40 channels) and channel spacing of 0.4 nm, the fibre-to-fibre loss was 6–9 dB and channel crosstalk was better than 25 dB. [This Letter first appeared in print in 1995, issue 17, p.1466–1467, and has been reprinted because of the significance of the corrections.]