Title :
Generation and Transmission of BB/MW/MMW Signals by Cascading PM and MZM
Author :
Li, Chung-Yi ; Su, Heng-Sheng ; Chang, Ching-Hung ; Lu, Hai-Han ; Wu, Po-Yi ; Chen, Chia-Yi ; Ying, Cheng-Ling
Author_Institution :
Inst. of Electro-Opt. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan
Abstract :
A bidirectional three-band lightwave transport system is proposed and experimentally demonstrated for both fiber-to-the-X (FTTX) and radio-over-fiber (RoF) networks. By cascading a phase modulator (PM) and a Mach-Zehnder modulator (MZM) to generate multiple coherent lightwaves, hybrid 1.25 Gbps baseband (BB), 1.25 Gbps/20 GHz microwave (MW), and 1.25 Gbps/40 GHz millimeter-wave (MMW) downstream signals and a 1.25 Gbps BB upstream signal are simultaneously transmitted. Furthermore, with an assistance of an optical signal-to-noise ratio (OSNR) enhancement circuit, sufficient low bit error rate (BER) values are experimentally achieved for both down-link BB/MW/MMW and up-link BB signals. No additional high-frequency local oscillator, mixers and upstream laser diode are required in both transmitter and receiver sites. Under this architecture, both wire-lined and wireless clients can be simultaneously served without using any extra device/equipment to convert the downstream signals among BB, MW and MMW formats.
Keywords :
error statistics; light transmission; microwave generation; microwave photonics; millimetre wave generation; optical modulation; optical receivers; optical transmitters; oscillators; phase modulation; radio-over-fibre; semiconductor lasers; Mach-Zehnder modulator; bidirectional three-band lightwave transport system; bit rate 1.25 Gbit/s; fiber-to-the-X networks; frequency 20 GHz; frequency 40 GHz; high-frequency local oscillator; high-frequency mixers; hybrid baseband; low bit error rate values; millimeter-wave downstream signals; multiple coherent lightwave generation; optical receiver; optical signal-to-noise ratio enhancement circuit; optical transmitter; phase modulator; radio-over-fiber networks; upstream laser diode; upstream signal; wire-lined clients; wireless clients; Adaptive optics; Optical fibers; Optical filters; Optical noise; Optical transmitters; Signal to noise ratio; Fiber-to-the-X; optical signal-to-noise ratio; phase modulator; radio over fiber;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2011.2180890
