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We present a monolithic segmented Mach-Zehnder transmitter, fully integrated in a 90 nm CMOS process. The transmitter exhibits a link sensitivity of −14.1 dBm optical modulation amplitude (OMA) at bit error rate (BER) = 10−-12 at 12.5 Gbps.
We demonstrate for the first time a 4×50Gb/s NRZ SWDM VCSEL link over 50m OM4 multimode fiber achieving error free operation (BER<1E-12). Transmission of 4×44Gb/s SWDM over 100m OM4 fiber with error free is also presented.
We built a 4-channel photonic carrier with input/output SiN waveguides and a flip-chip-attached SOA array, incorporating end-to-end reflection-management and mode-matching. All channels demonstrate fiber-to-fiber gain of >10dB and support error-free 4-λ × 25-Gb/s WDM links.
We propose a novel technique to measure the correlation between two optical frequencies using a FWM scheme. To verify, we measure the evolution of de-correlation as a function of the path length difference between them.
We demonstrate the tracking of white-FM noise and 1/fα excess noise from a SGDBR laser in a coherent system. The performance of 2nd-order phase-locked loop was experimentally examined in 16-QAM system at 16 Gbaud.
We experimentally show optically filtered lasers reduce OSNR penalty due to phase tracking error up to 3 dB for two parallel decision directed algorithms with feedback delay in an 11 Gbaud/s 16QAM coherent system.
Coherent communications have become a commercial reality with the deployment of 40 G and 100 G systems using Quadrature Phase Shift Keying (QPSK) in the core network. In the next evolution of these systems higher order modulation formats have the potential to significantly increase capacity while maintaining the baud rate at levels which allow the use of readily available lower cost electro-optics...
We propose a coherent receiver scheme based on phase modulation (PM) detection that recovers the in-phase (I) and quadrature (Q) components of the optical signal and potentially simplifies the front-end of a coherent optical receiver [1]. The scheme has been demonstrated for a differentially coherent, self-heterodyne receiver via simulations for DQPSK and experimentally for DBPSK. Fig. 1 shows the...
Due to the expected capacity crunch in DWDM optical networks, advanced optical modulation formats which offer high spectral efficiency are being increasingly deployed [1]. At the same time, a trend towards greater reconfigurability in the network is also taking place. Rapid reconfiguration of the optical network using dynamic circuit switching or optical packet switching allows the amplification bandwidth...
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