>100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/? IM/DD Systems

Theory of Main Resonances in Directly Modulated Diode Lasers

Domains of existence of the main resonances in directly modulated semiconductor lasers are obtained by application of quasi-conservative theory. The predictions are compared with numerical results coming from a direct integration of the model equations and with experimental observations reported by other groups. In both cases we find a qualitative good agreement. We consider a model that contai...

Phase-amplitude coupling characteristics in directly modulated quantum dot lasers

Widely tunable directly modulated sampled-grating DBR lasers

We report on the experimental results obtained for direct intensity modulation of widely tunable sampled-grating distributed Bragg-reflector (SGDBR) lasers. These devices operate in the C-band (1525 – 1562 nm range) and are directly modulated with analog and digital signals. The results obtained show a 6-GHz small-signal bandwidth, and an undistorted EyePattern for a NRZ signal modulation with ...

Gain and Bandwidth Enhancement of Directly Modulated Analog Fiber Optic Links Using Injection-Locked Gain-Coupled DF'B Lasers

Sub-carrier-multiplexed (SCM) fiber optic systems have received much attention for local access networks, fiber radios, and cable television distributions [l]. With SCM, multiple channels of analog videos and digital telephony/data can all be simultaneously transmitted by a single optical carrier and detected by the same photodetector. Direct modulation of semiconductor lasers is a simple, low-...

Energy-Efficient Power and Bandwidth Allocation in an Integrated Sub-6 GHz - Millimeter Wave System

In mobile millimeter wave (mmWave) systems, energy is a scarce resource due to the large losses in the channel and high energy usage by analog-to-digital converters (ADC), which scales with bandwidth. In this paper, we consider a communication architecture that integrates the sub-6 GHz and mmWave technologies in 5G cellular systems. In order to mitigate the energy scarcity in mmWave systems, we...