Abstract
A photonic ultra-wideband (UWB) pulse generator based on relaxation oscillations of a semiconductor laser is proposed and experimentally demonstrated. We numerically simulate the modulation response of a direct modulation laser (DML) and show that due to the relaxation oscillations of the laser, the generated signals with complex shape in time domain match the Federal Communications Commission (FCC) mask in the frequency domain. Experimental results using a DML agree well with simulation predictions. Furthermore, we also experimentally demonstrate the generation of FCC compliant UWB signals by externally injecting a distributed feedback (DFB) laser.
Highlights
Ultra-wideband (UWB) is a promising short range wireless communication technology due to its very low required signal-to-noise ratio (SNR) operation and wide bandwidth within unlicensed spectrum (3.1-10.6 GHz) specified by the Federal Communications Commission (FCC) [1]
We propose a photonic method to generate high-order Gaussian derivative UWB pulses with complex shape by utilizing the relaxation oscillations of a semiconductor laser
When a semiconductor laser is directly modulated by a current I(t), its modulation response can be described by the following set of rate equations, which show the interaction of photons and electrons within the active region [17]
Summary
Ultra-wideband (UWB) is a promising short range wireless communication technology due to its very low required signal-to-noise ratio (SNR) operation and wide bandwidth within unlicensed spectrum (3.1-10.6 GHz) specified by the Federal Communications Commission (FCC) [1]. UWB-over-fiber is attractive as a promising approach to extend the reach of UWB systems and to consolidate wireless personal access networks with FTTCP [2, 3] In this scenario, simple ways to generate UWB signals by photonic means are highly desired. A photonic UWB generator based on direct current modulation of a laser and chirp-to-intensity conversion has been experimentally demonstrated [15] Most of these efforts focus on the generation of monocycle or doublet pulses. We propose a photonic method to generate high-order Gaussian derivative UWB pulses with complex shape by utilizing the relaxation oscillations of a semiconductor laser. A photonic UWB generator by optical external injecting of a distributed feedback laser (DFB) is proposed and experimentally demonstrated
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