We design and model a highly compact and tunable optical add–drop multiplexer (OADM) device that consists of long-period gratings and piezoelectric ceramic fiber stretchers. The proposed OADM shows that 50 dense wavelength-division multiplexing channel signals can be selected in the wavelength range from 1526.25 to 1563.75 nm with 0.75-nm channel spacing, which covers the whole C -band gain spectrum of an erbium-doped fiber amplifier. The cross talk between channels is less than -39 dB , and the total insertion loss of the device is approximately 0.24 dB, which includes the splicing losses, the mode mismatching loss, and the expected losses in the two side-by-side coupled fibers.
© 2004 Optical Society of America
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.2330) Fiber optics and optical communications : Fiber optics communications
(230.1950) Optical devices : Diffraction gratings
Yinian Zhu, Ping Shum, Chao Lu, Pieter L. Swart, Beatrys M. Lacquet, and Stephanus J. Spammer, "Promising compact wavelength-tunable optical add-drop multiplexer in dense wavelength-division multiplexing systems," Opt. Lett. 29, 682-684 (2004)