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High-performance eight-channel multiplexer/demultiplexer for monomode fibers

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Abstract

This paper describes an eight-channel mono-mode wavelength division multiplexer (WDM) and presents the results of calculations on the effects of aberrations on monomode coupling. The WDM is a Stimax monomode wavelength division multiplexer/demultiplexer. The near-stigmatic Stimax optical configuration utilizes a diffraction grating and a concave mirror (Fig. 1) and is described in the literature.1–3 The multiplexer has an array of fibers, eight input fibers, 8 × 40 μm, and a single output fiber, 8 × 125 μm, located at the local plane in the grating window (Figs. 1 and 2). The channel center wavelengths of this particular device are 1.46–1.58 μm with 20-nm spacing for seven channels and an eighth channel at 1.3 μm. The spectral widths (Δλ) of the eight channels are ~3 nm at FWHM. The positions of the central wavelengths are reproducible to within 0.1–0.5 nm depending on the geometrical position of the fibers. The Stimax configuration is particularly stable with temperature; wavelength drift for the eight-channel WDM is < 10−2 nm/°C. As the long-term stability of the design is particularly good, these devices can be used in networks with DFB lasers.

© 1986 Optical Society of America

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