title: WDM up-conversion employing frequency quadrupling in optical modulator.
abstract: This work presents an optical up-conversion system with frequency quadrupling for wavelength-division-multiplexing (WDM) communication systems using a dual-parallel Mach-Zehnder modulator without optical filtering. Four-channel 1.25-Gb/s wired fiber-to-the-x (FTTx) and wireless radio-over-fiber (RoF) signals are generated and transmitted simultaneously. Moreover, the decline in receiver sensitivities due to Mach-Zehnder modulator bias drifts is also investigated. Receiver power penalties of the 20-GHz up-converted WDM signals and baseband (BB) FTTx signals are less than 1 dB when bias deviation voltage is less the 20% of the half-wave voltage. After transmission over a 50-km SSMF, the receiver power penalties of both the BB and 20-GHz RF OOK signals are less than 1 dB. Notably, 60-GHz optical up-conversion can be achieved using 15-GHz radio frequency (RF) components and equipment.
authors.affiliation: Department of Photonics, National Chiao-Tung University, Hsinchu, Taiwan, ROC. boris.eo95g@nctu.edu.tw
authors.forename: Po-Tsung
authors.initials: PT
authors.lastname: Shih
authors.forename: Chun-Ting
authors.initials: CT
authors.lastname: Lin
authors.forename: Wen-Jr
authors.initials: WJ
authors.lastname: Jiang
authors.forename: Jason Jyehong
authors.initials: JJ
authors.lastname: Chen
authors.forename: Han-Sheng
authors.initials: HS
authors.lastname: Huang
authors.forename: Yu-Hung
authors.initials: YH
authors.lastname: Chen
authors.forename: Peng-Chun
authors.initials: PC
authors.lastname: Peng
authors.forename: Sien
authors.initials: S
authors.lastname: Chi