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We investigated the effect of residual chromatic dispersion on phase-sensitive amplification of 20Gbaud 16QAM signals experimentally. We observed negligible impacts on amplification although the constellation is degraded in proportion to the amount of CD.
A new quantum well, namely InGaAsP/InAlGaAs, is used for electroabsorption modulator. High band-offset ratio between well and barrier induces strong exciton effect, leading to low fiber-to-fiber loss of −8dB, >25dB extinction ratio, and >30GHz bandwidth.
High-power, long-wavelength InP-based diode lasers emitting around 1.5 µm are needed for pumping solid-state lasers, direct-diode imaging applications, and eye-safe free-space optical communications. Optical systems significantly benefit from diode lasers with high wallplug efficiency (WPE), high brightness and reduced temperature sensitivity. Early work on 1.5 µm-emitting low-power (≤ 20 mW) lasers...
We review recent progress of space division multiplexing technologies using few-mode and multi-core fibers. Heterogeneous design has been demonstrated as a key technology for dense core arrangement. Highest spatial channel density and over-100 spatial channel count were realized with a heterogeneous 36-core 3-mode fiber.
Prototyping of photonic ASICs is easier than ever before. The value chain for development of photonic chips from application idea through simulation, design using advanced PDK tools, till fabrication and packaging is entirely enabled.
We fabricated an optical interferometric gyroscope front-end with a tunable laser on the heterogeneous silicon platform. We successfully demonstrated a laser based gyroscope with low noise floor comparable to a commercial ASE based gyroscope.
We demonstrate InP-based modified uni-traveling carrier balanced photodiodes integrated on silicon-on-insulator (SOI) waveguides with an internal responsivity of 0.78 A/W, 14 GHz bandwidth, and >20 dB common-mode rejection ratio (CMRR). The unsaturated RF output power reaches 15.2 dBm at 20 GHz.
Sophisticated techniques have been recently developed to achieve centimetric spatial resolution in distributed Brillouin fibre sensing, by-passing the slow response of this optoacoustic interaction by creating a localized stationary material vibration. More than 1'000'000 resolved points are demonstrated (1 cm resolution over 10 km).
We present different architectures of mode-locked lasers based on semiconductor devices for different applications of interest for microwave photonics like high frequency signal generation, low phase noise oscillators or high speed analogue signal sampling. For these applications we demonstrate both monolithic Fabry-Perot cavities and also external cavities using semiconductor optical amplifiers....
An OTDR similarity trace analyses based effective method for fault location in point-to-multipoint PON is presented and experimentally demonstrated. Fault caused by similar length between the branches can be discriminated.
Accurate self-orientation within a space can be achieved using only a simple photodetector and a remote Gallium Nitride micro-light-emitting diode array, emitting a time series of varying spatial illumination patterns onto the scene.
A new Yb3+-doped silica WGM microrod resonator laser is demonstrated using different pump-delivery and signal-collection configurations, which include evanescently-coupled microtapers or direct side-pumping.
The aerospace environment presents a formidable research and engineering challenge for designing, packaging and qualifying components for avionics-grade, active and passive, single-mode wavelength division multiplexing (WDM) [1]. New optoelectronic package interface and optical subassembly designs are currently under development for single-mode avionics WDM local area network (WDM LAN) as well as...
We report a refractive-index sensor based on surface plasmon resonance in etched plastic optical-fibers. Impact of fiber residual thickness and sensing length on the sensor's sensitivity is experimentally investigated.
We present the latest developments in multiple-input-multile-output (MIMO) based optical coherent transmission and present recent results performed over few-mode, multimode, and multicore fibers.
Novel hybrid III–V/Si Fabry-Perot lasers are studied under a combination of two optical feedbacks with a short (< 10 µm) and long (10 m) cavity. Operation of the device is greatly affected by short-cavity feedback.
We demonstrate that double-Rayleigh-scattering-induced optical-intensity noise in separate fibers is only partially correlated. Hence, double-Rayleigh-scattering contributes to the uncorrelated fiber-induced noise that limits the performance of active feedback cancellation in two-way unidirectional RF-photonic links.
We realize parity-time symmetry in a coupled active-passive microcavity system with balanced gain and loss. On-chip nonreciprocal light transmission and circulation due to gain-saturation nonlinearity are experimentally demonstrated with superior performance in high-Q microcavity systems.
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