We propose a novel method to optimize the transmission performance of the UWB-over-fiber system. In the proposed
UWB-over-fiber system, an UWB signal generator based on microwave photonics is used as the signal source in the
central unit. The UWB signal generator is used to generate high-order UWB signal. Direct sequence binary phase shift
keying (DS-BPSK) modulation and convolutional coding are applied to the baseband UWB signal. The dispersion and
transmission loss of the fiber can be compensated by a chirped fiber Bragg grating and an erbium-doped fiber amplifier,
respectively. The coherent receiving technology is applied for demodulation, and the Viterbi decoding technique is used
for channel decoding. The feasibility of the proposed scheme is demonstrated by simulations. At the forward error
correction (FEC) threshold of 3.8×10×−3 , the receiver sensitivity is around −16 dBm and the power penalty is around 0.2 dB,
after 25-km fiber transmission.
We propose and demonstrate an approach to generating a frequency-hopping (FH) microwave signal using an optoelectronic oscillator (OEO) based on stimulated Brillouin scattering (SBS). An SBS-based OEO is utilized to generate pure microwave signals as local frequency signal, and a dual-drive Mach–Zehnder modulator is employed to generate the FH signal. During the experiment, the local frequency generated by the OEO is 9.2 GHz with a power of 0 dBm and the FH signal hopping between 9.2 and 18.4 GHz is generated with FH speed up to 2 GHz.
A triple frequency- and phase-tunable optoelectronic oscillator based on stimulated Brillouin scattering effect and carrier phase-shifted single sideband (CPS-SSB) modulation is proposed and theoretically analyzed. In the structure, three pump lights are used to generate an oscillator signal in which the frequency is equal to triple the Brillouin frequency shift through the Brillouin gain–loss compensation. Benefiting from the wavelength-dependent characteristic of Brillouin shift, the triple frequency-tunable signal can be realized by directly tuning the laser source. The CPS-SSB modulation signal lies in the combination of a dual-parallel Mach–Zehnder modulator (DPMZM) and a tunable bandpass filter. The phase of the output microwave signal is changed by controlling the direct current bias voltage of DPMZM. Ultimately, a microwave signal, with a tunable frequency range from 26.3925 to 28.3425 GHz and a tunable phase from 0 deg to 360 deg, is obtained in theory. In addition, the theoretical simulation of the phase noise is below −110 dBc / Hz at the 10-kHz offset when tunable laser source is set at 1550 nm.
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