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14xx-nm pump lasers with double fiber Bragg gratings (FBGs) for Raman amplifiers show superior stable characteristics such as the lasing wavelength and power fluctuation in time domain comparing with 14xx-nm pump lasers with single FBG.
We fabricated high performance 1550 nm widely tunable lasers which are integrated 12-channel DFB laser array and SOA with buried-heterostructure configuration based on the AlGaInAs/InP system. We investigated the lasing performance at high temperature of the widely tunable laser. The output power as high as 90 mW at a temperature of 70 °C was achieved, which is the highest output power ever reported...
We have fabricated high performance 1550nm both solitary lasers and the 12-channel arrayed DFB/SOA integrated widely tunable lasers with buried-heterostructure configuration in the AlGaInAs/InP system. An output power of 100mW was obtained for tunable lasers at 20°C.
We demonstrated a semiconductor optical amplifier hybrid-integrated with a silica-based planar lightwave circuits. With deploying polarization diversity circuit, polarization dependent gain was reduced from 22.9 dB to 1.8 dB in C-band.
We carefully analyzed NF and output power depending on QW number and waveguide structure of MQW SOAs. The developed SOA with a NF of 3.7 dB can be used for a limiting or booster amplifier.
The lattice constant of a single-defect photonic crystal vertical-cavity surface-emitting laser (PhC-VCSEL) is numerically optimized to achieve the highest single-mode power in the fundamental mode. The simulated results are compared to measured device characteristics, and the different factors influencing the single-mode behavior are analyzed.
An 8 ch DFB-LD-PLC hybrid device was fabricated with high precision active alignment. The coupling loss between the DFB-LD and the PLC was 3.6 dB. All of 8 ch DFB-LDs oscillated appropriately.
Thermal lens effect on single-transverse-mode stability of proton-implanted photonic-crystal vertical-cavity surface-emitting lasers is studied. Theoretical and experimental demonstration of the trade-off between the single-mode stability and low loss. Single-mode stability with a smaller lattice constant is also discussed.
Photonic crystal confinement incorporated into vertical cavity surface-emitting lasers (VCSELs) produces reduced excess loss as the aperture diameter decreases. The improved scaling enables a new topology of coupled vertical cavity lasers.
A GaInAsP/InP surface emitting laser has been demonstrated grown by chemical beam epitaxy (CBE) for the first time. The device has a 30 mu m round-low mesa with a 1.0 mu m active layer. The threshold current as low as 2.7 mA (455 A/cm/sup 2/) was obtained under 77 K CW operation (=1.43 mu m). This is the lowest value of long wavelength SE lasers ever reported. These results show the possibility of...
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