1.31 um Uncooled DFB-LD with High Slope Efficiency for G-PON Application

MIMO-OFDM WDM PON with DM-VCSEL for femtocells application.

We report on experimental demonstration of 2x2 MIMO-OFDM 5.6-GHz radio over fiber signaling over 20 km WDM-PON with directly modulated (DM) VCSELs for femtocells application. MIMO-OFDM algorithms effectively compensate for impairments in the wireless link. Error-free signal demodulation of 64 subcarrier 4-QAM signals modulated at 198.5 Mb/s net data rate is achieved after fiber and 2 m indoor w...

High-Speed EA-DFB Laser for 40-G and 100-Gbps

We have developed a high-speed electroabsorption modulator integrated distributed feedback (EA/DFB) lasers. Transmission performance over 10 km was investigated under 25 Gbps and 43 Gbps modulation. In addition, the feasibility of wide temperature range operation was also investigated. An uncooled EA/DFB laser can contribute to the realization of low-power-consumption, small-footprint and coste...

External Optical Modulator Using a Low-cost Fabry-Perot LD for Multicasting in a WDM-PON

An external optical modulation using absorption nulls in a Fabry-Perot laser diode (FP-LD), has been proposed and experimentally demonstrated for multicasting in a WDM-PON. The center wavelengths of absorption nulls in an FP-LD move to short-wavelength rapidly by only a small current (~1 mA) injection. If the current injection is stopped, the nulls move back to the original position. Such a mov...

High Sensitivity Uncooled InAsSb Photoconductors with Long Wavelength

High Efficiency, Low Power-Consumption DFB Quantum Cascade Lasers Without Lateral Regrowth

Very low power-consumption distributed feedback (DFB) quantum cascade lasers (QCLs) at the wavelength around 4.9 μm were fabricated by conventional process without lateral regrowth of InP:Fe or using sidewall grating. Benefitted from the optimized materials and low waveguide loss, very low threshold current density of 0.5 kA/cm2 was obtained for a device with cavity length of 2 mm. Combined wit...