Browsing by Author "Wei, Zhi-Rui"

Now showing 1 - 4 of 4

106-fJ/(bit.km) 2-km OFDM OM4 MMF Transmissions for Energy Efficient Optical Interconnects
(2013)
Lu, I-Cheng
;
Chen, Hsing-Yu
;
Wei, Chia-Chien
;
Shi, Jin-Wei
;
Tsai, Sheng-Fan
Employing high-performance 850-nm VCSELs with oxide-relief and Zn-diffusion structures, we demonstrate 17.8-Gbps 2-km OM4 fiber transmissions. Meanwhile, ultra-low EDDR of 106 fJ/(bit km) with bias current as low as 1.9 mA is achieved.
Optimization of mode numbers of VCSELs for small-cell backhaul applications
(2015-07-15)
Lu, I-Cheng
;
Wei, Chia-Chien
;
Shi, Jin-Wei
;
Chen, Hsing-Yu
;
Tsai, Sheng-Fan
This paper reports optical orthogonal frequency-division multiplexing (OFDM) transmission using 850 nm Zn-diffusion Vertical-Cavity Surface-Emitting Lasers (VCSELs) and multimode fiber (MMF) for small-cell backhaul applications. We also investigated the influence of side mode suppression ratio (SMSR) on the performance of OFDM modulation. By further optimizing the Zn-diffusion conditions and oxide aperture size, a high-power (6.7 mW) SM (SMSR > 30 dB) VCSEL is demonstrated. By using OFDM modulation and bit-loading algorithm, record-high BRDP (91 Gb/s km) at 26 Gb/s transmission under FEC threshold (bit error rate (BER) < 3.8 x 10(-3)) across 3.5 km OM4 fiber has been successfully demonstrated. (C) 2015 Elsevier B.V. All rights reserved.
Single-Mode, High-Speed, and High-Power Vertical-Cavity Surface-Emitting Lasers at 850 nm for Short to Medium Reach (2 km) Optical Interconnects
(2013-12-15)
Shi, Jin-Wei
;
Wei, Zhi-Rui
;
Chi, Kai-Lun
;
Jiang, Jia-Wei
;
Wun, Jhih-Min
The vertical-cavity surface-emitting lasers (VCSELs) with high single-mode (narrow linewidth) output power are essential to minimize chromatic dispersion and to further improve the bit-rate distance product in a multimode fiber, which has a significant propagation loss (similar to 3.5 dB/km) at 850 nm wavelength. Here, we demonstrate the detailed design considerations and fabrication of a single-mode, high-power, and high-speed VCSELs at the 850 nm wavelength with oxide-relief and Zn-diffusion apertures for the application of short (0.3 km) to medium reach (2 km) optical interconnects. By optimizing the relative geometric sizes between two such apertures in our demonstrated 850-nm VCSELs, we can not only attain high single-mode output power (similar to 6.5 mW), but also with a reasonable threshold current (< 2.0 mA). Furthermore, the spatial hole burning effect induced low-frequency roll off can also be minimized in our optimized structure to obtain a maximum data rate up to 26 Gbit/s. The record-high bit rate-distance products for OM4 MMF transmission under ON-OFF keying (14 Gbit/s x 2.0 km) modulation formats have been successfully demonstrated by the use of our VCSEL.
Ultra Low Power VCSEL for 35-Gbps 500-m OM4 MMF Transmissions Employing FFE/DFE Equalization for Optical Interconnects
(2013)
Lu, I-Cheng
;
Shi, Jin-Wei
;
Chen, Hsing-Yu
;
Wei, Chia-Chien
;
Tsai, Sheng-Fan
By use of optimized design 850-nm VCSELs under OOK modulation and FFE/ DFE equalization, high bit-rate distance product (35-Gbps 500-m and 25-Gbps 1000-m) through OM4 MMF transmissions with ultra-low power consumption are successfully achieved.