Direct CATV modulation and phase remodulated radio-over-fiber transport system

Abstract

A novel transport system, with directly modulating community antenna television (CATV) signal downstream and phase-remodulating radio-over-fiber (ROF) signal upstream, is proposed and experimentally demonstrated. By modulating multi-carriers CATV signal in amplitude domain and ROF signal in phase domain, a single optical wavelength is able to serve these two applications simultaneous. To be the first system of communicating CATV signal downstream and phase remodulating radio signal upstream, the performances of transmitting CATV and radio signals over 20 km single-mode fiber (SMF) were experimentally verified. Good performances of carrier-to-noise ratio (CNR), composite second-order (CSO), and composite triple beat (CTB) were obtained for CATV applications as well as high extinction ration (ER) and low bit error rate (BER) values were measured for ROF transmission.

Technologies for future wavelength division multiplexing passive optical networks

“…TDM-PONs offer cost-effective solutions; however, they suffer from the limited bandwidth [6,7]. WDM-PON increases the exploitation of the optical fibre bandwidth [8][9][10][11][12]. In WDM-PON, high data rate transmission in both uplink and downlink directions can be simply achieved for each optical network unit (ONU), where a dedicated pair of wavelengths is allocated to each ONU.…”

Based on FP LDs with split band technique in two-channel fiber optical CATV transport system

“…For fiber optical CATV transport systems, the maximum fiber link using cascaded erbium-doped fiber amplifiers (EDFAs) is limited by RF parameters such as carrier to noise ratio (CNR), composite second-order (CSO), and composite triple beat (CTB) [1,2]. These parameters can be seriously degraded by stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and fiber dispersion effects in 1550-nm fiber optical CATV transport systems.…”

Nonlinear distortion evaluation in a directly modulated distributed feedback laser diode-based fiber-optic cable television transport system

“…[1][2][3][4][5] Therefore, the transmission quality of such a system has been defined and regulated, which basically determines the signal-receiving quality of the system based on the following three parameters: carrier-to-noise ratio (CNR), composite second order (CSO), and composite triple beat (CTB). 6 Both noise and nonlinear effects in the fiber-optic CATV transmission system are mostly caused by active components but rarely by passive components.…”