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We numerically investigate direct detection of 28- Gbps-class PAM4 signals with receiver-side digital signal processing for bandwidth-efficient short reach optical transmissions, mainly including DD-LMS based linear equalization, 3-tap noise-whitening post filter and BCJR algorithm based MAP detector.
Bandpass sampling-based coherent detection of multiband subcarrier multiplexed signals was experimentally demonstrated over phase-modulated radio-over-fiber links. Theoretical analysis and experiments are conducted to evaluate the transmission performance. In addition, for multiband transmission, an effective method for determining the valid analog-to-digital converter sampling frequency ranges is...
By the bias-voltage-dependent responsivity, a direct-detection photo detector is proposed to eliminate the third-order intermodulation for the intensity-modulation analog photonic link. Spurious-free dynamic range of 123.4 dB within 1-Hz bandwidth is achieved with 18.1-dB improvement.
The performance of using bandpass sampling technique in optical phase-modulated and coherent detection (PM-CD) radio-over-fiber (RoF) links is analyzed. Additionally, a method to select aliasing-free bandpass sampling frequency is derived. This method is suitable for subcarrier multiplexing (SCM) scenario with the presence of independent free-running optical local oscillator (LO) caused frequency...
We propose a high-efficient photonic approach that can simultaneously down-convert, compress and invert the spectrum of multiband RF signal through coherently heterodyning the optic-carried multiband RF signal with a frequency carefully aligned optical frequency comb. A proof of concept experiment with dual band RF spectral manipulation is demonstrated to validate this proposal. Performance is also...
We demonstrate a photonic-assisted broadband radio frequency (RF) channelization scheme based on dual coherent optical frequency combs (OFCs). The advantages include coarse optical alignment requirement, ideal rectangular frequency response in each channel without any ultra-narrow optical filters, and digitalized output for further processing. System performance and key issues will be discussed.
We design a cost-effective broadband radio over fiber (RoF) transceiver based on 1310 nm 10 GbE commercial off the shelf (COTS) optical components, with up to 4.3 GHz bandwidth. The suppression of 3rd intermodulation distortion (IMD3) is as high as 50dBc, and the spurious-free dynamic range (SFDR) of RoF links based on this transceiver reaches 85 dB/Hz2/3. An error vector magnitude (EVM) of 3% is...
We propose and characterize a promising digital coherent receiver for analog photonic link architecture based on a novel I/Q-demodulation module. Using the proposed scheme, signal demodulation of QPSK modulated RF carrier is experimentally demonstrated.
Coherence multiplexing (CM) based Radio-over-Fiber (RoF) system is experimentally investigated for the first time for both single tone RF signal and ultra-wideband orthogonal frequency division multiplexing (UWB-OFDM) signal. The impact of received optical power, linewidth of the optical source, input RF power and fiber length are considered. It is found that the system is seriously limited by beat...
We experimentally demonstrate the wireless transmission of optically generated DPSK signals based on heterodyne detection with high receiver sensitivity. Using this scheme, an approach to deliver two DPSK channels is proposed for FDM application.
We propose and experimentally demonstrate a novel photonic scheme to generate differential-phase amplitude-shift keying (DPASK) or circular quadrature amplitude modulation (QAM) signal at microwave/millimeter-wave band for Radio-over-Fiber applications. In our proposed scheme, the electronic driven circuits are greatly simplified by employing photonic vector modulation technique in which only an electro-optical...
A novel QAM coherent subcarrier multiplexing system which is based on heterodyne detection is proposed and demonstrated experimentally. At the transmitter side, intermediate frequency carrier modulation which is used for subcarrier enables demodulation of QAM with heterodyne detection. The experiment and theoretical simulation show that the coherent optical system operating for multi-channel using...
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