A full-duplex WDM-RoF system based on tunable optical frequency comb generator

Abstract A prototype of full-duplex wavelength-division-multiplexing-based radio-over-fiber (WDM-RoF) system using a single continuous wave (CW) laser at central station (CS) is proposed and investigated. In the proposal, the tunable optical frequency comb (OFC) generator is performed by cascading an electro-absorption modulator (EAM), a phase modulator (PM) and a Mach–Zehnder intensity modulator (IM). Then the proposed OFC is used as the source of WDM-RoF network. The base station (BS) is simplified by using central carrier along with downlink multi-frequency millimeter-wave signals (MMWs). In the scheme, we obtain 21 comb lines within 0.2 dB power deviation with an interval about 10 GHz. Then we apply it to a bidirectional 1:7 WDM-RoF cellular network. For the downlink, three MMWs with frequencies of 40 GHz, 60 GHz and 80 GHz are obtained. For the uplink, 7 WDM channels carrying upstream signal are converted simultaneously. Both down and uplink delivery over 20 km transmission with less than 1 dB power penalty, which shows high spectral-efficiency and good performance over long-distance delivery.

[1]  A. Takada,et al.  Multicarrier Light Source With Flattened Spectrum Using Phase Modulators and Dispersion Medium , 2009, Journal of Lightwave Technology.

[2]  Nathan J Gomes,et al.  Radio Over Fiber Link Design for Next Generation Wireless Systems , 2010, Journal of Lightwave Technology.

[3]  Tetsuya Kawanishi,et al.  Widely wavelength-tunable ultra-flat frequency comb generation using conventional dual-drive Mach-Zehnder modulator , 2007 .

[4]  Gee-Kung Chang,et al.  Key Enabling Technologies for Optical–Wireless Networks: Optical Millimeter-Wave Generation, Wavelength Reuse, and Architecture , 2007, Journal of Lightwave Technology.

[5]  Rui Wu,et al.  Generation of very flat optical frequency combs from continuous-wave lasers using cascaded intensity and phase modulators driven by tailored radio frequency waveforms. , 2010, Optics letters.

[6]  Jing Li,et al.  Frequency-reconfigurable terahertz wireless transmission using an optical frequency comb based on radio-over-fiber technology , 2014 .

[7]  Lin Chen,et al.  A Novel Radio-Over-Fiber System With Wavelength Reuse for Upstream Data Connection , 2007, IEEE Photonics Technology Letters.

[8]  Wei Jin,et al.  Scalable and reconfigurable generation of flat optical comb for WDM-based next-generation broadband optical access networks , 2014 .

[9]  T. Kuri,et al.  Wavelength-division-multiplexed Millimeter-waveband radio-on-fiber system using a supercontinuum light source , 2006, Journal of Lightwave Technology.

[10]  Chen-Bin Huang,et al.  Spectral Line-by-Line Pulse Shaping on an Optical Frequency Comb Generator , 2007, IEEE Journal of Quantum Electronics.

[11]  Jun Ye,et al.  Colloquium: Femtosecond optical frequency combs , 2003 .

[12]  Gee-Kung Chang,et al.  Optical millimeter-wave generation or up-conversion using external modulators , 2006, IEEE Photonics Technology Letters.

[13]  T. Sakamoto,et al.  Asymptotic formalism for ultraflat optical frequency comb generation using a Mach-Zehnder modulator. , 2007, Optics letters.

[14]  Chen Chen,et al.  Wired/wireless access integrated RoF-PON with scalable generation of multi-frequency MMWs enabled by tunable optical frequency comb. , 2013, Optics express.

[15]  L.P. Barry,et al.  Remote downconversion with wavelength reuse for the radio/fiber uplink connection , 2006, IEEE Photonics Technology Letters.

[16]  E. Wong,et al.  Next-Generation Broadband Access Networks and Technologies , 2012, Journal of Lightwave Technology.

[17]  Dexiu Huang,et al.  Comparison analysis of optical frequency comb generation with nonlinear effects in highly nonlinear fibers. , 2013, Optics express.

[18]  Ting Wang,et al.  Centralized Lightwave Radio-Over-Fiber System With Photonic Frequency Quadrupling for High-Frequency Millimeter-Wave Generation , 2007, IEEE Photonics Technology Letters.

[19]  T. Hänsch,et al.  Optical frequency metrology , 2002, Nature.

[20]  Jianping Yao,et al.  Generation and distribution of a wide-band continuously tunable millimeter-wave signal with an optical external modulation technique , 2005, IEEE Transactions on Microwave Theory and Techniques.

[21]  Zhao Yang Dong,et al.  Low-cost optical line terminal for a WDM-PON compatible with radio-over-fiber systems , 2009 .

[22]  Lin Chen,et al.  A Radio-Over-Fiber System With a Novel Scheme for Millimeter-Wave Generation and Wavelength Reuse for Up-Link Connection , 2006, IEEE Photonics Technology Letters.