Abstract
We designed and configured a highly compact and tunable optical add–drop
multiplexer (OADM) device that consists of long-period gratings (LPGs) and
piezoelectric ceramic fiber stretchers. The modeling for the proposed OADM predicts
that 50 International Telecommunication Union (ITU) dense wavelength-division
multiplexing (DWDM) channel signals could 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 (EDFA). The cross talk between
channels is less than –39 dB, and the total insertion loss of the device is ~0.24
dB, which includes the splicing loss, the mode-mismatching loss, and the expected
loss in the two side-by-side coupled fibers. We can tune add–drop channels within a
limited region by changing the voltage, which is applied to the piezoelectric
ceramic (PZT) fiber stretchers. This technique is suitable for the in-line
implementation of optical communication networks.
© 2003 Optical Society of America
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