Wen-I Lin

Improvement of Fiber-Optical CATV Transport Systems Performance Based on Lower-Frequency Sidemode Injection-Locked Technique

A split-band directly modulated fiber-optical CATV transport system based on a lower-frequency sidemode injection-locked technique is proposed and demonstrated. The lower-frequency sidemode injection-locked technique largely increases the resonance frequency of slave laser, which leads to an improvement of system performance. Excellent performances of carrier-to-noise ratio, composite second-order, and composite triple beat were achieved for the full channel band over a 100-km single-mode-fiber transmission.

Direct-detection full-duplex radio-over-fiber transport systems

A full-duplex radio-over-fiber transport system based on a direct-detection scheme is proposed and demonstrated. In this approach, the rf power degradation induced by fiber dispersion can be avoided for downlink transmission within the base station zone and for uplink transmission, even as the optical carrier and two sidebands are transmitted. A data signal of 70 Mbps/10 GHz transmitted over an 80 km single-mode fiber transport for both downlink and uplink with a low bit error rate (<10(-9)) and high spurious-free dynamic range (>100 dB/Hz(2/3)) values were achieved.

A Full-Duplex Radio-on-Photonic Crystal Fiber Transport System

A full-duplex radio-on-fiber transport system based on wavelength-division-multiplexing and optical add-drop multiplexing techniques, as well as proper length of photonic crystal fiber (PCF) is proposed and demonstrated. Over a combination of single-mode fiber and PCF transmission, low third-order intermodulation-distortion-to-carrier ratio (IMD3/C) and bit-error-rate values were obtained in our proposed systems. Such a proposed full-duplex radio-on-PCF system is suitable for the long-haul microwave optical links

Externally modulated CATV/ROF transport systems based on negative dispersion fiber

An externally modulated lightwave cable television (CATV)/radio-over-fiber (ROF) transport system based on negative dispersion fiber (NDF) as the transmission medium is proposed and demonstrated. Good performances of carrier-to-noise ratio (CNR), composite second-order (CSO) and composite triple beat (CTB) were obtained for the CATV signals; low bit error rate (BER) and third-order intermodulation distortion to carrier ratio (IMD3/C) values were achieved for ROF applications. The negative dispersion property compensates the positive chirp and results in systems with better transmission performances.

Employing Fabry-Perot Etalon and Split-Band Technique to Improve Directly Modulated Fiber Optical CATV System Performances

A directly modulated AM-VSB CATV EDFA-repeated system that uses Fabry-Perot (FP) etalon and split-band technique is proposed and demonstrated. Good performances of CNR, CSO and CTB were achieved for the full channel band over a-100 km single-mode fiber (SMF) transport.

Radio-on-DWDM Transport Systems Based on Injection-Locked Fabry-Perot Laser Diodes

A radio-on-dense-wavelength-division-multiplexing (DWDM) transport system based on injection-locked Fabry-Perot laser diodes (FP LDs) with four microwave carriers and large effective area fiber (LEAF) transmission was proposed and demonstrated. Good performance of bit error rate (BER) and intermodulation distortion to carrier ratio (IMD/C) over a-50km of LEAF was obtained. Signal quality meets the demands of personal handy system (PHS)/vehicle information and communication system (VICS)/electronic toll collection (ETC)/satellite broadcasting (SB).

A Full-Duplex Radio-over-Fiber Transport System

A full-duplex radio-over-fiber transport system based on an Fabry-Perot laser diode (FP LD) with an optical bandpass filter at the central station, as well as employing an optical circulator with a fiber Bragg grating at the base station, is proposed and demonstrated. Good transmission performances estimated by bit-error rate and eye diagram are obtained in our proposed systems. Since our proposed systems use only an FP LD as a light source for both down-link and up-link transmissions, it reveals a prominent alternative with advantages in simplicity and cost.

Directly modulated fiber optical CATV transport systems without optical amplification

We propose and demonstrate a repeaterless directly modulated fiber optical CATV transport system based on half-split-band and remote light injection techniques. Good performances of carrierto-noise ratio (CNR), composite second order (CSO) and composite triple beat (CTB) were obtained over a 50-km single mode fiber (SMF) transmission without optical amplification. Our proposed repeaterless directly modulated fiber optical CATV transport systems are simpler and cost lower than conventional externally modulated ones.

A Radio-on-Hybrid WDM Transport System Based on Mutually Injection-Locked F-P LDs

A radio-on-hybrid wavelength-division-multiplexing (WDM) transport system employing mutually injection-locked Fabry-Perot laser diodes (F-P LDs) is proposed and demonstrated. System performances evaluated by carrier to noise ratio (CNR), composite second order (CSO), composite triple beat (CTB), bit error rate (BER) for simultaneous transmission of CATV/LAN/ITS are improved. Our proposed systems are relatively simple and potentially low cost due to the use of mutually injection-locked F-P LDs as broadband light source (BLS).

Employing split-band and only one sideband techniques to improve fiber optical CATV system performance

A directly modulated NTSC 77-channel fiber optical CATV transport system based on split-band and only one sideband techniques is proposed and demonstrated. Good performances of carrier-to-noise ratio (CNR), composite second-order (CSO) and composite triple beat (CTB) were obtained in our proposed systems over a 100 km standard single-mode fiber (SMF) transmission. Since an expensive externally modulated transmitter, sophisticated optical single sideband (SSB) modulation and stimulated Brillouin scattering (SBS) suppression techniques are not used, it reveals an outstanding system with simplicity and economic advantages over that of an externally modulated transport system.