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26 January 1999 Multimode-fiber-compatible WDM/WDDM with an ultralarge-wavelength dynamic range
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In this article, wavelength division multiplexing (WDM) devices suitable for multimode- fiber-based networks are presented. A packaged wavelength division demultiplexer (WDDM) is demonstrated first at wavelengths of 750 nm, 780 nm, 810 nmj and 840 nm. The insersion losses are 8.28 dB, 9.41 dB, 6.78 dB, and 11.71 dB, respectively. The reduction of wavelength separation from 30 nm to 2 nm is achieved using a beveled-edge to couple optical signals into a waveguiding plate. A path-reversed substrate-guided wave holographic interconnection is employed for a WDDM with a channel wavelength spacing as small as 2 nm. A waveguide grating with a 45° incident angle and a 45° diffraction angle is fabricated using 20 pm thick DuPont photopolymer film HRF 600x001. The dispersion and the 3 dB bandwidth of the device are measured to be 0.18°/nm and 20 nm, respectively. A four-channel wavelength demultiplexing is demonstrated at 796 nm, 798 nm, 800 nm, and 802 nm with no crosstalk observed. A one-to-five cascaded 4-channel WDDM with ± 5% energy uniformity under an spolarization is also demonstrated to increase the user-sharing capacity. Twenty fanout channels (5x4) are experimentally achieved. Its potential application for dense WDM at 1555 nm is also addressed. Time-reversal of die demonstrated devices automatically provides the WDM function.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ray T. Chen, Jian Liu, and Xuegong Deng "Multimode-fiber-compatible WDM/WDDM with an ultralarge-wavelength dynamic range", Proc. SPIE 10293, Wavelength Division Multiplexing: A Critical Review, 1029305 (26 January 1999);

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