Performance Assessment of Radio Links Using Millimeter-Wave Over Fiber Technology With Carrier Suppression Through Modulation Index Enhancement
ABSTRACT We have proposed and experimentally demonstrated a new radio-over-fiber system technique generating optical millimeter-waves with central carriers suppressed by simply tuning the modulation index of an optical phase modulator without requiring any complicated bias control circuits or narrowband optical filters. Error-free transmission of the generated 40-GHz optical mm-wave with 2.5-Gb/s data over 10-km single mode fiber (SMF-28) and 3-m air distance was achieved. The experimental results were analyzed and compared with the traditional method that requires a specific carrier suppression optical filter. The power penalty caused by the crosstalk between wavelength division multiplexed (WDM) channels was experimentally measured and studied and was about 4 dB at a bit error rate (BER) of 10-9. The filter bandwidth requirement, achievable carrier suppression ratio, and harmonics fluctuation due to fiber dispersion were also theoretically analyzed.
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ABSTRACT: What we believe to be a new scheme to generate an optical millimeter wave with octupling of the local oscillator via a nested LiNbO3 Mach-Zehnder modulator (MZM) is proposed and implemented by numerical simulation. Since the response frequency of the modulator and the local frequency are largely reduced, the bandwidth requirement of the transmitter to the optical and electrical components is reduced greatly. Then, the parameters of the nested modulator are analyzed theoretically, and we find that both the extinction ratio of the MZM and the phase imbalance between its two arms have influence on the performance of the generated optical millimeter wave.Journal of Optical Networking 09/2008; 7(10):837-845. · 1.08 Impact Factor
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ABSTRACT: Based on improved optical carrier suppressed double sideband modulation with 60 GHz repetitive frequency, a full-duplex radio-over-fiber transport system using a single source at central office was proposed and demonstrated. Carrier suppressed double sideband optical signal was generated by using an optical phase modulator and dense-wavelength-division-multiplexing technique, as well as an additional external amplitude modulator for loading baseband downlink data to one first-order sideband. A dense-wavelength-division-multiplexer was used to separate the two first-order sidebands; the lower sideband was used to carry 5 Gbit/s downstream data, whereas the upper sideband was sent to base station for reuse of modulating upstream data. The limitation of chromatic dispersion is greatly reduced due to that only one sideband is modulated. Therefore, the system of bidirectional transmission shows cost-efficient configuration and good performance over 80 km delivery with less than 1.5 dB power penalty. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1473–1476, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24361Microwave and Optical Technology Letters 03/2009; 51(6):1473 - 1476. · 0.59 Impact Factor
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ABSTRACT: We proposed and experimentally demonstrated a novel hybrid subcarrier modulation (H-SCM) technique to generate a spectral-efficient 60-GHz optical millimeter-wave (mm-wave) that carries independent 2.5-Gb/s wireless and 10-Gb/s wireline signals using intensity and phase modulation, respectively. The frequency beating components of the 60-GHz channel due to interleaved and imbalanced optical path in H-SCM are numerically analyzed and experimentally measured in terms of timing jitter and amplitude fluctuation. The generated 60-GHz optical mm-wave signal using H-SCM with phase noise variance of about 0.5 is demonstrated in a radio-over-fiber testbed propagating through a combined distance of 25-km fiber and 4-m free space. The power penalties for the received wireless and wireline signals are 1 and 0.2 dB at 10<sup>-9</sup> bit-error rate, respectively.IEEE Photonics Technology Letters 09/2009; · 2.04 Impact Factor