Search

Based on rate equations of semiconductor laser, a symbolically-defined model for optical transmission system performance evaluation and network characterization in both time- and frequency-domains is presented. The steady-state and small-signal characteristics, such as current–photon density curve, current–voltage curve, and input impedance, can be predicted from this model. Two important dynamic characteristics, second-order harmonic distortion and two-tone third-order intermodulation products, are evaluated under different driving conditions. Experiments show that the simulated results agree well with the published data. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 539–542, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22180 [ABSTRACT FROM AUTHOR]

Annealing properties of proton-exchanged optical waveguides in z-cut LiNbO3 fabricuted using toluic acid are reported. Variations in the surface refractive index and waveguide depth with annealing time are found to follow a power-taw relationship, and a minimum propagation loss of 0.23 dB/cm is measured at 0.633-µm wavelength. [ABSTRACT FROM AUTHOR]

Annealing of proton-exchanged planar optical waveguides in z-cut LiNbO3 fabricated using stearic acid has been studied systematically. The effects of annealing on waveguide propagation loss, surface index change, and waveguide depth were measured as a function of annealing time, and were found to follow a power-law relationship. [ABSTRACT FROM AUTHOR]

The article presents a computational method for calculating the electric potential and field distributions in a coupled coplanar waveguide with finite electrode thickness. This method provides a simple and fast approach to the quasistatic analysis of the structures. The same structure with infinitely thin electrodes is also analyzed using conformal-mapping techniques, and excellent agreement of the results is obtained between the two methods. [ABSTRACT FROM AUTHOR]

An L-band 360° broad-bandwidth analog phase shifter is designed using varactor. New design equations for expanding bandwidth and improving linear phase-shift are derived and applied to performances optimization in one circuit. The analog phase shifter is fabricated using MIC and SMT technologies. At 1.2 ∼ 2.0 GHz (L-band), total phase-shift of 360° and linear deviation of less than ±2.5% were obtained, and the insertion loss varied less than 2 dB across the band. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 36: 164–166, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10709 [ABSTRACT FROM AUTHOR]

Multiwavelength oscillation has been obtained in an erbium-doped fiber laser. A double-pass optical fiber Mach–Zehnder interferometer is employed as a comb filter inside the laser cavity. To reduce the homogeneous linewidth, the erbium-doped optical fiber was immersed in liquid nitrogen. Simultaneous oscillation of ten wavelengths is observed. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 270–272, 1999. [ABSTRACT FROM AUTHOR]