3,483 research outputs found
Multi-wavelength fiber laser with erbium doped zirconia fiber and semiconductor optical amplifier
Multi-wavelength hybrid fiber lasers are demonstrated in both ring and linear cavities using a fabricated Erbium-doped Zirconia fiber (EDZF) and semiconductor optical amplifier (SOA) as gain media. In both configurations, the a fiber loop mirror, which is constructed using a 3 m long polarization maintaining fiber (PMF) and a polarization insensitive 3dB coupler is used as a comb filter for the fiber laser. In the ring cavity, 10 simultaneous lines with peak power above -26 dBm is obtained at 1550 nm region. This is an improvement compared to the linear cavity configuration which has only 5 simultaneous lines observed from wavelength 1556.1 nm to 1563.0 nm with the peak power above -40 dBm. Both hybrid lasers has a constant line spacing of 1.7 nm, which is suitable for wavelength division multiplexing and sensing applications and shows a stable operation at room temperature
High-speed, solid state, interferometric interrogator and multiplexer for fiber Bragg grating sensors
We report on the design and prototyping of a robust high-speed interferometric multiplexer and interrogator for fiber Bragg grating sensors. The scheme is based on the combination of active WDM channel switching and passive, instantaneous interferometry, allowing the resolution of virgin interferometric interrogators to be retained at MHz multiplexing rates. In this article the system design and operation are described, and a prototype scheme is characterized for three sensors and a multiplexing rate of 4 kHz, demonstrating a noise floor of 10 nε/√Hz and no cross-sensitivity. It is proposed that the system will be applicable to demanding monitoring applications requiring high speed and high resolution measurements across the sensor array
On-chip generation of heralded photon-number states
Beyond the use of genuine monolithic integrated optical platforms, we report
here a hybrid strategy enabling on-chip generation of configurable heralded
two-photon states. More specifically, we combine two different fabrication
techniques, \textit{i.e.}, non-linear waveguides on lithium niobate for
efficient photon-pair generation and femtosecond-laser-direct-written
waveguides on glass for photon manipulation. Through real-time device
manipulation capabilities, a variety of path-coded heralded two-photon states
can be produced, ranging from product to entangled states. Those states are
engineered with high levels of purity, assessed by fidelities of 99.58\%
and 95.08\%, respectively, obtained via quantum interferometric
measurements. Our strategy therefore stands as a milestone for further
exploiting entanglement-based protocols, relying on engineered quantum states,
and enabled by scalable and compatible photonic circuits
Reconfigurable photonic integrated mode (de)multiplexer for SDM fiber transmission
A photonic integrated circuit for mode multiplexing and demultiplexing in a
few-mode fiber is presented and demonstrated. Two 10 Gbit/s channels at the
same wavelength and polarization are simultaneously transmitted over modes LP01
and LP11a of a few-mode fiber exploiting the integrated mode MUX and DEMUX. The
proposed Indium-Phosphide-based circuits have a good coupling efficiency with
fiber modes with mode-dependant loss smaller than 1 dB. Measured mode
excitation cross-talk is as low as -20 dB and a channel cross-talk after
propagation and demultiplexing of -15 dB is achieved. An operational bandwidth
of the full transmission system of at least 10 nm is demonstrated. Both mode
MUX and DEMUX are fully reconfigurable and allow a dynamic switch of channel
routing in the transmission system
Optical signal processing via two-photon absorption in a semiconductor microcavity for the next generation of high-speed optical communications network
Due to the introduction of new broadband services, individual line data rates are expected to exceed 100 Gb/s in the near future. To operate at these high speeds, new optical signal processing techniques will have to be developed. This paper will demonstrate that two-photon absorption in a specially designed semiconductor microcavity is an ideal candidate for optical signal processing applications such as autocorrelation, sampling, and demultiplexing in high-speed wavelength-division-multiplexed (WDM) and hybrid WDM/optical time-division-multiplexed networks
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