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In this paper, a 60cm free-space optical card-to-card wavelength division multiplexing (WDM) transmission architecture using OFDM modulation and coherent detection is proposed and demonstrated, which can offer flexibility and high speed transmission simultaneously. The experimental results show that the net data rate is up to 106.9Gb/s and the receiver sensitivity is −34dBm at the BER threshold of...
We propose a high efficient graphene-on-gap modulator (GOGM) by employing the hybrid plasmonic effect, whose modulation efficiency is ∼8-folds larger than that of present graphene-on-silicon modulator (GOSM) (∼0.1 dB / μm). The proposed modulator has the advantage of short modulation length ∼3.6 μm, relatively low insertion loss ∼0.32 dB and larger modulation bandwidth ∼0.48 THz. Moreover, an efficient...
High extinction ratio is needed in high precision Optical Time Domain Reflectometer (OTDR) to enlarge the dynamic range. By transmitting part of pulse signal modulated by a Mach-Zehnder (MZ) optical modulator back to the input of the modulator via a feedback circuit, the pulse signal can be multi-modulated by one MZ optical modulation. And this technique offers great enhancements in the performance...
Optical sinusoidal wave generation on four channels simultaneously is experimental demonstrated using a self-starting optoelectronic oscillator. The frequency of the sinusoidal wave can be widely tuned from 25 GHz to 200 GHz with 25-GHz spacing. The timing jitter of the microwave signal extracted from the oscillator is measured to be 218 fs.
This work demonstrated the specific process and the influence factors of the optical millimeter-wave (MM-wave) generation and proposed the selection and control of the optical sidebands in Radio-over-Fiber (ROF) system based on the external modulation technology. In the system, it is explained theoretically and experimentally that the optical sidebands and the amplitude of optical sidebands can be...
To achieve the better combination of cost and communication capacity, this paper proposes a colourless ONU remodulation scheme based on R-QDSOA in WDM-PON. The R-QDSOA can provide a modulation bandwidth over 20GHz and achieve directly modulation of high-order signal. Here, two remodulation schemes (respectively NRZ/4QAM and 4QAM/NRZ) at different modulation rates are implemented, which offers good...
We demonstrate a silicon PAM-4 optical modulator, which is based on a symmetric Mach-Zehnder interferometer. Two uncorrelated binary electrical signals with different peak-to-peak voltages are applied to the phase shifters of the silicon optical modulator. Accordingly, two different phase shifts are generated in the two arms. After the permutation, there are totally four phase differences between...
In this paper, we propose and experimentally demonstrate a linearization technique to modify the nonlinear transfer function of a phase modulation link. The phase modulation signal is converted into intensity modulation signal, and the phase of the optical carrier band is shifted. Eventually the third-order intermodulation distortion (IMD3) components produced by different optical spectrum components...
Elastic optical network (EON) has been receiving extensive attention due to its inherent flexibility and the efficiency with which it allocates fiber bandwidth. Depending on the physical impairment, the distance adaptive modulation scheme can be adopted to ensure the transmission quality. However, distance adaptive modulation scheme will occupy more spectrum resources for the long-distance path. A...
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