Title :
Analytical formula of wavelength-dependent transparent current and its implications for designing wavelength sensors and WDM lasers
Author_Institution :
Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan
Abstract :
The wavelength dependency of transparent current is investigated theoretically and empirically for bulk and quantum-well (QW) materials. A new analytical formula is presented for obtaining accurate Fermi levels of QW structures under current injection. The transparent current can be described with an exponential function of the wavelength using two fitting parameters. The simple expression can clearly indicate the fundamental limit of the wavelength resolution when the wavelength dependency is applied for wavelength sensing. The formula was also exploited to obtain the condition of achieving uniform threshold current for wavelength division multiplexing (WDM) lasers that may cover a wide range of wavelength
Keywords :
Fermi level; optical design techniques; optical sensors; optical transmitters; quantum well lasers; semiconductor optical amplifiers; wavelength division multiplexing; WDM lasers; accurate Fermi levels; current injection; exponential function; fitting parameters; fundamental limit; optical design; optical sensors; quantum-well laser materials; transparent current; uniform threshold current; wavelength dependency; wavelength division multiplexing; wavelength resolution; wavelength sensing; wavelength sensors; wavelength-dependent transparent current; Diode lasers; Fiber lasers; Laser theory; Optical design; Optical materials; Quantum well lasers; Semiconductor lasers; Semiconductor optical amplifiers; Threshold current; Wavelength division multiplexing;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/2944.954131
