Search

A theoretical study of optical properties of subwavelength-diameter silica fibers is presented, with an emphasis on the interplay between dispersion and nonlinearity. The normalized dispersion and effective nonlinearity are used to analyze the diameter-dependent relative strength at all wavelengths. The dispersion and nonlinearity length are calculated for guiding waveguide dimension design for possible applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2086–2090, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23552 [ABSTRACT FROM AUTHOR]

A novel interrogation of fiber Bragg grating (FBG) in a strain sensor, which is based on Er-doped fiber laser's transient regime, is reported. The applied strain on FBG changes the laser cavity loss, which in turn modifies the laser's transient regime. The strain value can be obtained by measuring the build-up time of the laser. This method translates wavelength shift information into time domain that can be accurately measured with low-cost electronic devices. In the experiment, the strain sensitivity can be adjusted by simply controlling the pumping level of the laser, a sensitivity of 1.66 μℇ/μs is achieved under fitful pumping level. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:1904–1904, 2006; Published online in Wiley InterScience (www.interscience.wiley.com(. DOI 10.1002/mop.21773 [ABSTRACT FROM AUTHOR]

A novel device using a phase-shifted long-period grating cascaded with one normal long-period grating is designed to flatten the gain spectrum of EDFAs with all of three gain peaks. The experimental results show that the 3-dB bandwidth of flattened EDFA is 46 nm, and gain peak-to-peak is approximately 0.9 dB. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 153–157, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10853 [ABSTRACT FROM AUTHOR]

The characteristics of an apodized long-period grating are studied experimentally and theoretically. It has no side-lobes and almost zero insertion loss in the pass band. Changing the dc and maximum ac index along the z direction of LPG can conveniently control wavelength and the value of peak loss. Suitable spectral profile of gain-flattening filter with low insertion loss is obtained by writing two or three consecutive apodized sub-gratings in one fiber with the different UV power level in the second exposure. The experiment results are in good agreement with the simulation results. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 283–286, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10583 [ABSTRACT FROM AUTHOR]

We demonstrate a highly birefringent photonic-crystal fiber by utilizing combined asymmetric core design and intentional stress-induced anisotropy. Based on spectral measurements of the polarization-mode interference, we measure that the fiber has a beat length of about 0.33 mm at 1545 nm. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 498–500, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20348 [ABSTRACT FROM AUTHOR]

A simple switchable dual-wavelength Er-doped fiber-ring laser using a fiber Bragg grating (FBG) written in high-birefringence (HiBi) fibers is proposed. Due to the two-peak reflections with orthogonal polarizations of the FBG, the polarization hole-burning effect in the cavity is greatly enhanced. Experimental results show that a stable dual-wavelength laser with very close wavelength separation (0.39 nm) can be generated at room temperature. Furthermore, the FBG in the HiBi fiber offers flexibility for selection of the laser wavelength. By adjusting a polarization controller, the laser can be switched between the stable single- or dual-wavelength lasing operations. [ABSTRACT FROM AUTHOR]

A cantilever beam and fiber Bragg grating are used to measure acceleration. The output signal is insensitive to temperature variations from -20°C to 40°C, and the output signal fluctuates less than 5% without any temperature compensation schemes. For the experimental system, a linear output range of 8 g can be detected. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 151–153, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10852 [ABSTRACT FROM AUTHOR]

In this paper we propose a new method for the measurement of the relative group delay of WDM components, based on photonic microwave technique using a low frequency (below 1.3 GHz) scalar network analyzer. Experimental results demonstrate that this technique has the advantages of low cost, simplicity, and high accuracy (less than ±1 ps). © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 346–348, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10602 [ABSTRACT FROM AUTHOR]

We present and demonstrate experimentally a new method for measuring the polarization mode dispersion (PMD) of chirped fiber Bragg gratings. The technique can also be used to measure chromatic dispersion (CD) more accurately by eliminating the influence of PMD. [ABSTRACT FROM AUTHOR]