Hybrid OFDM and Radio-Over-Fiber Transport System Based on a Polarization Modulator

• Main Authors: Ching-Hung Chang, Peng-Chun Peng, Han-Wen Gu, Chin-Wang Huang, Meng-Hsin Fang, Hsuan-Lun Hu, Po-Tso Shen, Chung-Yi Li, Hai-Han Lu
• Format: Article
• Language: English
• Published: IEEE 2015-01-01
• Series: IEEE Photonics Journal
• Subjects: Optical fiber communication; radio-over-fiber system
• Online Access: https://ieeexplore.ieee.org/document/7243295/
• ISSN: 1943-0655

A hybrid orthogonal frequency-division multiplexing (OFDM) and quadruple-frequency radio-over-fiber (RoF) transport system is developed based on colorless optical polarization beam splitters and an optical polarization-arrangement technique. No optical filter is required to eliminate any specific optical wavelength from the hybrid transport system; the employed optical wavelength and central carrier frequency of the transmitted radio-frequency signal can be dynamically adjusted without alerting the transmission performance of the proposed hybrid transport system. To prove the concept of the quadruple-frequency technique, a 40-GHz millimeter-wave (MMW) signal quadrupled from a 10-GHz signal is experimentally demonstrated in an optical domain. Its advancement is then employed to experimentally accomplish a hybrid OFDM and quadruple-frequency RoF signal transmission over a 25-km span of single-mode fiber. The advancement of the hybrid transport system is evaluated and demonstrated by error-free transmissions and clear eye and constellation diagrams. This proposed system is a great candidate for greatly reducing the cost of simultaneously transmitting OFDM and MMW signals over optical access networks and makes it more practical to be employed.