Experimental Measurement of Fiber-Wireless Transmission via Multimode-Locked Solitons From a Ring Laser EDF Cavity

Abstract

This paper describes a demonstration of soliton transmission over fiber-wireless (Fi-Wi) networks using mode-locked stable solitons over a 50-km-long fiber and a shortdistance wireless link. Ultrashort optical pulse sources in the 1.5-m region are seen as increasingly important for achieving ultrahigh-speed optical transmission and signal processing at optical nodes. Mode-locked solitons were generated by a simple ring laser cavity incorporating a very thin layer of carbon nanotube (CNT), together with an erbiumdoped fiber (EDF) laser used as an active bulk gain medium. Experimental measurements involved the transmission of the generated mode-locked soliton over a 50-km-long single-mode fiber (SMF), and a radio-frequency (RF) spectrum subsequently generated was a result of beating frequency of wavelengths launched into the photodetector at the other end of the SMF. This RF spectrum array was in the range of WiFi frequencies. System performance was evaluated by first selecting one of the RF carriers centered at 2.5 GHz via an RF bandpass filter and subsequently using this carrier to transmit quadrature phase-shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) data signals. The described optical circuit, containing an EDF laser, a CNT, an SMF, and a wireless link, was shown to achieve ultrastable transmission of mode-locked soliton over a long-distance Fi-Wi network.

Manipulating of nanometer spacing dual-wavelength by controlling the apodized grating depth in microring resonators

“…is the dispersion length [42] of the Gaussian pulse and 2 β is the second order coefficient term of the Taylor expansion of the propagation constant [43,44]. When Gaussian pulse propagates within the coupled MRRs, the resonant output is formed for each round-trip [45,46]. Both MRRs have same radius of 8 µm, and the power coupling coefficients are κ 1 =κ 2 =κ 3 =0.1.…”

Novel D-shaped fiber fabrication method for saturable absorber application in the generation of ultra-short pulses

“…While active modulation allows for a high level of control over the various characteristics of the output pulses, the size and cost of the various optoelectronic components involved make it a less desirable approach. On the other hand, passive mode-locking methods, including nonlinear amplifying loop mirrors (NALMs), nonlinear polarization rotation (NPR) and saturable absorbers (SAs) are able to generate the desired mode-locked pulses, with performance characteristics that are highly suited to the desired applications [15][16][17][18][19][20][21]. A key material in the fabrication of SAs lately is graphene and its derivatives, particularly graphene oxide (GO), which has been recognized as a suitable material for the generation of femtosecond pulses due to its large optical nonlinearity and ultrafast carrier relaxation [22,23].…”

A stable dual-wavelength Q-switch using a compact passive device containing photonics crystal fiber embedded with carbon platinum

“…Although output pulse characteristics are controllable in active modulation, the size and cost of the various optoelectronic components make it a less desirable approach [6]. On the other hand, passive Q-switch and mode-locking methods can produce the desired mode-locked pulses, with performance characteristics that are highly suited to the desired applications [7][8][9][10].…”