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We propose unequal sideband intensity based modulation scheme called vestigial sideband scheme (VSB) for the radio over fiber system (RoF) using concatenated Mach-Zehnder modulator (MZM) and phase modulator (PM). This scheme can be generated with proper adjustment of the modulation indexes of the modulators. MZM-PM configuration can also be used for generating single sideband (SSB) and carrier suppressed...
In this paper, we investigate the generation of ultra-flat Optical Flat Comb Source (OFCS) using an asymmetrically driven Dual Arm Mach-Zehnder modulator (DA-MZM). A modified simulated annealing-based optimization method is applied to derive the necessary ranges for which the comb source is ultra-flat (less than 1 dB ripple) over 2, 4, 8, 16 and 32 carriers where the driving signals are well within...
Ultra-Wide Band radio-over-fiber (UWBoF) techno-logy involves two kinds of communications. One is the UWB wireless communication, and the other is optical fiber communi-cation. In this paper, the UWBoF receiving system based on the external modulation such as Mach-Zehnder (M-Z) modulator is analyzed. The UWBoF components and the UWBoF receiver structure are introduced. The received high frequency...
We report on theoretical, numerical and experimental study of a new form of instability in a nonlinear fiber. This process of higher-order modulation instability arises from the nonlinear superposition of elementary instability dynamics.
An asynchronous rational harmonic mode-locked fiber laser (ARHML) is demonstrated experimentally. Through the asynchronous mode-locking mechanism, the output pulse train has a wider optical spectrum and very uniform amplitudes with the un-wanted harmonic frequency components highly suppressed.
We propose the use of optical frequency multiplication as a cost-effective method to optically generate wireless radio frequencies (RFs) and deliver them from a central station to remote radio access units. In this paper, a theoretical analysis for the parameters affecting the intensity of the generated harmonics is investigated. Simulation results show that the generation of high order harmonic components...
the optical pulses at a multiplied repetition frequency is generated by Fractional Talbot effect in optical fiber. The optical pulses at 20GHz, 40GHz and 50GHz repetition frequency are obtained from the original pulse with 2.8ps width at 10GHz and the optical pulses at 5GHz is octupled to 40GHz.
The transmission of 64 QAM radio data signals with a data rate up to 150 Mb/s through long single mode fiber links at different frequencies has been experimentally evaluated. The system under study uses the optical frequency multiplication technique for the generation of carriers in the microwave and millimeter-wave bands. Transmission using frequencies of 18.7 GHz, 19.5 GHz, 19.7 GHz and 29 GHz is...
We present, both numerically and experimentally, the nonlinearity effect of the intensity modulator in RoF transmitters through the comparison between single-carrier QAM and multi-carrier OFDM signals. The acceptable RF power level of the multi-carrier OFDM signal is 2 dB less compared with the single-carrier signal for the same EVM penalty of 1%, indicating the degradation due to inter-modulation...
We report a compact two-dimensional accelerometer based upon a simple fiber cantilever constructed from a short length of multicore optical fiber. Two-axis measurement is demonstrated up to 3 kHz. Differential measurement between fiber Bragg gratings written in the multicore fiber provides temperature-insensitive measurements.
Tunable diode laser spectroscopy (TDLS) can only be successfully implemented if a number of system characterization procedures and critical parameter measurements can be made accurately. These include: application of a wavelength/frequency scale to the signals recovered in time; measurement of the frequency dither applied to the laser; measurement of the relative phase between the laser power modulation...
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