Implementation of tunable erbium doped fiber laser using a broadband fiber mirror

Abstract

Compact microstrip bandpass filters with good selectivity and stopband rejection, IEEE Trans Microwave Theory Tech 54 (2006), 533-539. 2. L. Ralph, and V.S. Richard, M. George, Design of microwave filters, IEEE Trans Microwave Theory Tech 50 (2002), 783-793. 3. S.P. Hong and K. Chang, Stub-tuned microstrip bandpass filters for millimeter-wave diplexer design, IEEE Microwave Wireless Compon Lett 15 (2005), 582-584. 4. J.S. Hong and M.J. Lancaster, End-coupled microstrip slow-wave resonator filter, Electron Lett 32 (1996), 1494 -1496. 5. J.S. Hong and M.J. Lancaster, Theory and experiment of novel microstrip slow-wave open-loop resonator filters, IEEE Trans Microwave ABSTRACT: By using a broadband fiber mirror (BFM), a wavelength tunable erbium-doped fiber laser (TEDFL) is demonstrated composed with tunable fiber Bragg grating (TFBG). The BFM acts as a broadband reflector both for the lasing signal and pump source. At pumping power of 100 mW, stable laser output power of 21.35 dBm is obtained at a low threshold pumping power of 4.7 mW. A side mode suppression ratio (SMSR) of 57.9 dB and 16 nm wavelength scan range are demonstrated using a single TFBG. The tunable fiber laser may be a good candidate for vast applications in optical network technologies. ABSTRACT: In handheld communications devices there is not much room for the placement of antennas. This problem is exacerbated when more than one antenna is needed for use in a MIMO communications system. It is then useful to be able to utilize some of the existing device structure to form the required antennas. In this article, we show how the characteristic mode theory can be used to achieve this in a way that results in antennas with the low envelope correlation preferred for MIMO antennas.