Shah-Jye Tzeng

Intermodulation distortion suppression in a full-duplex radio-on-fiber ring network

A full-duplex radio-on-fiber (ROF) ring network based on electroabsorption modulator (EAM) low bias voltage, RF amplifier predistorter, wavelength-division-multiplexing (WDM), and optical add-drop multiplexing techniques is proposed and demonstrated. Over a long-haul fiber ring network transmission, low third-order intermodulation distortion to carrier ratio (IMD/sub 3//C) and bit error rate (BER) values were obtained in our proposed full-duplex ROF ring network.

Bidirectional hybrid CATV/radio-over-fiber WDM transport system.

A bidirectional hybrid cable antenna television (CATV)/radio-over-fiber (ROF) wavelength-division-multiplexing (WDM) transport system using injection locking technique to suppress the rf power degradation, tunable optical bandpass filter to generate optical single-sideband format for the CATV signal or only one optical sideband format for the ROF one, and photonic crystal fiber to reduce the net dispersion is proposed and demonstrated. Impressive performances of the carrier-to-noise ratio, the composite second-order, the composite triple beat, and the bit error rate were obtained in our proposed systems.

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.

Cso/Ctb Performance Improvement by Using Fabry-Perot Etalon at the Receiving Site

An externally modulated NTSC 77-channel erbium-doped fiber amplifier (EDFA)-repeated system employing Fabry-Perot (FP) etalon at the receiving site to improve system performance was proposed and demonstrated. In comparison with conventional externally modulated fiber optical CATV transport systems, good performance of carrier-to-noise ratio (CNR), composite second order (CSO), and composite triple beat (CTB) were achieved for the full channel band over a 100-km single-mode fiber (SMF) transmission. Our proposed systems are suitable for the long-haul fiber optical CATV transport systems.

Bidirectional Radio-Over-DWDM Transport Systems Based on Injection-Locked VCSELs and Optoelectronic Feedback Techniques

A bidirectional radio-over-dense-wavelength-division-multiplexing transport system using injection-locked and optoelectronic feedback controlled vertical-cavity surface-emitting lasers (VCSELs) is proposed and demonstrated. It is shown that the system performance, which is evaluated by using bit-error rate, error vector magnitude, and intermodulation distortion-to-carrier ratio, is improved due to using injection-locked and feedback controlled VCSELs

Repeaterless Hybrid CATV/16-Qam OFDM Transport Systems

Hybrid transport system employing half-split-band and remote light injection techniques is proposed and demonstrated. Over an 80-km SMF transmission, good performances of CNR, CSO, CTB and BER were obtained for CATV and 16-QAM OFDM band.

Analysis on DFB laser diode with main and multiple side modes injection-locked

One distributed feedback (DFB) laser diode with main and multiple side modes injection-locked is proposed and demonstrated. DFB laser diode can be successfully injection-locked not only in the main mode but also in the side modes. The side mode suppression ratio (SMSR) value of each injection-locked mode is enhanced, thereby, it can be a promising candidate for the use of multiple optical sources. Our proposed scheme has the potential to be used as optical sources for radio-on-wavelength division multiplexing (WDM) transport systems to provide multiple services.

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

Repeaterless hybrid CATV/16-QAM OFDM transport systems

Hybrid transport system employing half-split-band and remote light injection techniques is proposed and demonstrated. Over an 80-km SMF transmission, good performances of CNR, CSO, CTB and BER were obtained for CATV and 16-QAM OFDM band.

CSO/CTB performances improvement by using optical SSB filter at the receiving site

We propose and demonstrate an externally modulated national television system committee (NTSC) 77-channel erbium-doped fiber amplifier-repeated system employing an optical single sideband filter at the receiving site. In comparison with conventional externally modulated fiber-optical CATV systems, excellent performances of carrier-to-noise ratio /spl ges/50 dB, composite second order /spl ges/70 dB, and composite triple beat /spl ges/69 dB were achieved for the full channel band over a 100-km single-mode fiber transport. Our proposed system is suitable for the long-haul fiber-optical CATV system.