Wavelength-tunable add/drop multiplexer for dense wavelength division multiplexing using long-period gratings and fiber stretchers

摘要

A novel wavelength-tunable add/drop multiplexer is designed and proposed to be bused as a signal selector in dense wavelength-division multiplexing systems, which is based on four identical long-period gratings assembled on four same structured piezoelectric ceramic fiber stretchers, and their operation of wavelength-selective coupling modes. By contrast to fiber Bragg gratings used in add/drop multiplexer, long-period gratings could be specifically designed to operate in transmission mode.