Browsing by Author "Jiang, Jia-Wei"

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Energy Efficient 850 nm Vertical-Cavity Surface-Emitting Lasers with Extremely Low Driving-Current Density for > 40 Gbit/sec Error-Free Transmissions from RT to 85 degrees C
(2015)
Chi, Kai-Lun
;
Jiang, Jia-Wei
;
Yen, Jia-Liang
;
Lu, I-Cheng
;
Kuo, H. -C.
850nm VCSELs with record-low driving-current-density (8kA/cm(2)) small resistance (6012), wide-bandwidth (26GHz), and small energy-to-data-rate ratio (228fJ/bit; 3.5mA) for >41Gbit/sec error-free transmission over 100 (2) meter OM4 fiber at room-temperature (85 degrees C) have been demonstrated. (C) 2014 Optical Society of America
Nonlinear Compensation for 980 nm High Power, Single-Mode VCSELs for Energy Efficient OM 4 Fiber Transmission
(2014-01-01)
Lu, I-Cheng
;
Wei, Chia-Chien
;
Chen, Hsing-Yu
;
Chung, Pei-Yu
;
Huang, Peng-Hao
A nonlinear compensation method is demonstrated to boost the launch power for optical interconnects employing OFDM format. A 1.5 dB sensitivity improvement is obtained for a 2-km OM4 fiber transmission system at 15 Gbit/sec.
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.
Strong Wavelength Detuning of 850 nm Vertical-Cavity Surface-Emitting Lasers for High-Speed (>40 Gbit/s) and Low-Energy Consumption Operation
(2015-11-01)
Chi, Kai-Lun
;
Yen, Jia-Liang
;
Wun, Jhih-Min
;
Jiang, Jia-Wei
;
Lu, I-Cheng
The strong (>20 nm) wavelength detuning technique has been demonstrated to enhance the modulation speed and high-temperature characteristics (at 85 degrees C), as well as lower the required driving current density performance of oxide-relief 850-nm vertical-cavity surface-emitting lasers (VCSELs) for >40 Gbit/s operation. By increasing the wavelength detuning from 15 to 20 nm, a significant improvement in the electrical-to-optical (E-O) bandwidth (20 to 27 GHz) of the VCSEL can be observed. This detuning design (similar to 20 nm) is incorporated along with a Zn-diffusion structure into our oxide-relief VCSEL with a miniaturized oxide-relief aperture (similar to 3 mu m). Highly single-mode, high-speed (26 GHz) operation, and moderate differential resistance (100 Omega) values can be simultaneously achieved. In addition, it is found that devices with a further larger detuning wavelength (>20 nm) and enlarged oxide-relief apertures (similar to 8 mu m) can sustain the same maximum E-O bandwidth (26 GHz) as that of a miniaturized (similar to 3 mu m) VCSEL, resulting in the lower driving current density (8 versus 18.8 kA/cm(2)) required for high-speed performance. Excellent transmission performance, which includes an extremely low energy-to-data rate ratio (EDR: 228 fJ/bit; over 100 m OM4 fiber) and record-low driving-current density (8 kA/cm(2); 3.5 mA) has been successfully achieved for 41 Gbit/s error-free transmission for these VCSELs.