Fiber transmission and generation of ultrawideband pulses by direct current modulation of semiconductor lasers and chirp-to-intensity conversion

Abstract

Optical pulses generated by current modulation of semiconductor lasers are strongly frequency chirped. This effect has been considered pernicious for optical communications. We take advantage of this effect for the generation of ultrawideband microwave signals by using an optical filter to achieve chirp-to-intensity conversion. We also experimentally achieve propagation through a 20 km nonzero dispersion shifted fiber with no degradation of the signal at the receiver. Our method constitutes a prospective low-cost solution and offers integration capabilities with fiber-to-the-customer-premise systems.

A photonic ultra-wideband pulse generator based on relaxation oscillations of a semiconductor laser

“…Therefore, the 16-bit 12.5 Gbit/s pattern sequence has to be '0101 1111 1111 1111' in the simulation, which is the logical equivalent pattern of '1010 0000 0000 0000' used in the experiment. It is noted that double ones in the logical pattern are set to obtain higher-order UWB pulses than those reported in [15]. As seen in Fig.…”

“…The first derivative of a Gaussian pulse is referred to as a monocycle, and the second derivative is known as a doublet. Recently, many methods have been proposed to generate UWB signals in the optical domain [4][5][6][7][8][9][10][11][12][13][14][15]. Typically, these methods can be divided into two broad classes: time delay and nonlinear signal processing.…”

“…For example, a microwave differentiator [11], nonlinear pulse shaping of FBG [12] and nonlinear modulation of electro-optical modulators [13,14] have been proposed. Meanwhile, a photonic UWB generator based on direct current modulation of a laser and chirp-to-intensity conversion has also been experimentally demonstrated [15]. Most of these efforts focus on the generation of monocycle or doublet pulses.…”

Gbps impulse radio (IR) ultra-wideband (UWB) transmission over 100 meters multi mode fiber with 4 meters wireless transmission

“…UWB pulse generation by nonlinear processing has been demonstrated using a microwave differentiator [9], using nonlinear pulse shaping of fiber Bragg gratings [10], and using nonlinear modulation of electroopic modulators [11], [12]. Additionally, in [13] UWB generation using a directly modulated laser together with chirp to intensity modulation was demonstrated, in [14] the carrier dynamics of an uncooled distributed feedback laser was used to generate the UWB signal, a demonstration of optical generation and transmission with included wireless transmission is presented in [15], a multi-hub system employing polymer fiber is demonstrated in [16], and an analysis of UWB transmission in FTTH networks is presented in [17].…”

Photonic Ultra-Wideband 781.25-Mb/s Signal Generation and Transmission Incorporating Digital Signal Processing Detection

“…For example, use of a microwave differentiator [8], nonlinear pulse shaping of FBG [9], and nonlinear modulation of electrooptical modulators [10], [11] have been proposed. In addition, a photonic UWB generator based on the direct current modulation of a laser and chirp-to-intensity conversion has also been experimentally demonstrated [12].…”