Dispersion-enhanced volume hologram for dense wavelength-division demultiplexer

A fully packaged dense wavelength-division demultiplexer (DWDDM) by using dispersion-enhanced volume holographic grating and silicon V-grooved fiber array is demonstrated. The device demultiplexes eight optical channels within C band with 2 nm wavelength spacing. The system insertion losses are -5.68, -5.6, -5.40, -5.3, -5.68, -5.59, -5.58, and -5.49 dB, respectively. Typical cross-talks among these eight channels are less than -35 dB. The trade-off between getting smaller physical packaging size and linear dispersion ability at different wavelength is addressed. The device is designed for optical communications for Metropolitan area networks where both free space DWDM and multimode fiber band networks are jointly employed.