NON-SINUSOIDAL OPTICAL FIBER FILTERS AND METHOD OF MAKING THE SAME

摘要

An optical fiber filter (25) with a non-sinusoidal wavelength response is produced by forming an adiabatic taper in a single mode fiber (10) and forming non-adiabatic tapers (18, 20) on slopes at each end of the elongated central region of this adiabatic tape and in the middle of the central region (12). The non-adiabatic taper (22) in the middle of the central region (12) produces a phase shift in the wavelength response leading to non-sinusoidal filtering characteristics. The filter may be combined with a Mach-Zehnder interferometer to produce a Mach-Zehnder device with a non-sinusoidal wavelength response.