Title :
Narrow-band spectral filter made of W-index and step-index fibers
Author :
Chung, Chul-Jong ; Safaai-Jazi, Ahmad
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
fDate :
1/1/1992 12:00:00 AM
Abstract :
An all-fiber spectral filter constructed with a W-index fiber, supporting a dominant mode with nonzero cutoff frequency, and a step-index single-clad fiber is proposed and analyzed. The proposed filter offers a spectral width on the order of one nanometer, considerably narrower than that provided by a filter made of two single-clad fibers having the same transmission wavelength. The narrow spectral width is achieved by exploiting a relatively large slope difference between the dispersion characteristics of the W-index and step-index fibers constituting the filter. As an example case, the transmission characteristic of the proposed filter with peak transmission at 1300 nm is calculated and compared with that of a corresponding filter made of two single-clad fibers
Keywords :
optical communication equipment; optical dispersion; optical fibres; optical filters; refractive index; spectral line breadth; 1300 nm; W-index fiber; all-fiber spectral filter; dispersion characteristics; dominant mode; large slope difference; narrow spectral width; narrow-band filters; nonzero cutoff frequency; optical waveguide theory; peak transmission; single-clad fiber; spectral width; step-index fibers; transmission wavelength; Cutoff frequency; Narrowband; Optical fiber communication; Optical fiber couplers; Optical fiber filters; Optical fiber theory; Optical reflection; Optical waveguides; Propagation constant; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
