A compact refractive index (RI) sensing probe with controllable sensitivities based on a θ-shaped microfiber resonator and Vernier effect is reported. By cascading the θ-shaped microfiber resonator with a fiber Fabry-Perot interferometer, Vernier effect is generated to enhance the RI sensitivity. Both theoretical analyses and experimental results demonstrate that the RI sensitivity can be tuned by changing the cavity length of the θ-shaped microfiber resonator. The RI sensitivity is widely tuned from 311.77nm/RIU to 2460.07nm/RIU in the experiment. The θ-shaped microfiber resonator and the proposed method of generating Vernier effect could find important applications in optical fiber sensing field.
Recent years, the research of mid-infrared (mid-IR) photonics has inspired increasingly interest due to their potential
applications in a wide variety of areas, including free-space communications, chemical or biological sensors,
environmental monitors, thermal imaging, IR countermeasures and medical procedures. On the other hand, third
harmonic generation (THG) has been demonstrated to be a versatile tool to realize high speed optical performance
monitoring of in-band OSNR and residual dispersion. The mid-IR light sources based third-order frequency conversion
opens an entirely new realm of nonlinear interactions. Nevertheless, rare experimental or analytical THG modeling has
been published. In this work, we theoretically investigate the possible efficient phase-matched THG in a double symmetric
plasmonic slot waveguide (DAPSW) based on a mid-IR light source. Nonlinear organic material DDMEBT with thirdorder
susceptibility of χ(3) = 1×10-19 m2/V2 is integrated into the top metallic slot region as the main slot core medium.
Silicon (Si) is used to fill the bottom metallic slot region. Silver (Ag) is considered to be the metal medium due to its low
Ohmic loss. The needed phase-matching condition (PMC) is satisfied between the zeroth mode at fundamental
frequency (FF) and the first mode at third harmonic (TH) by appropriate designing the waveguide geometrical
parameters. The associated parameters such as the width and height of the slot, pump-harmonic modal overlap, figureof-
merit (FOM), pump power and detuning have been numerically investigated in detail. Finally, the conversion
efficiency comes up to 1.69×10-5 with pump power of 1 W and the corresponding waveguide length is 10.8 μm.
We propose an output 2-queue optical buffer system to provide multi-class QoS in terms of throughput, loss and delay,
that can be realized by implementing the state-of-art optical buffer technology in the near future. The proposed optical
buffer system can be used at the output port of an optical router in an optical switching network (OPS). It resembles its
electronic equivalent in terms of operational functionality. Analytical modeling derives the performance metrics and the
numerical results are demonstrated.
IP with generalized multi-protocol label switching (GMPLS) directly over WDM is recognized as the promising
architecture for next generation network (NGN), which utilizes all-optical transparent model in its physical layer
without optical-electrical-optical (OEO) conversion. However, the architecture itself raises the coupling issue of optical
and network layers, which just begins drawing the attention of researchers. We present a systematic approach for
evaluating performance of an illustrative 40Gbps 16λ IP/GMPLS over WDM network, considering both linear and
nonlinear optical impairments. Results obtained show that the effective network performance parameters are affected by
optical impairment apparently.
Current trend of integrating IP and WDM technology is to evolve core IP networks away from the overlay model and
towards more integrated solutions - IP/GMPLS over WDM, which enables more efficient usage of optical bandwidth.
However, the removal of ATM and/or SONET/SDH layers implies possible coupling of optical and network layers.
This work aims to raise the necessity and elaborate a cross-layer approach of counting optical impairments into the
performance evaluation of IP/GMPLS over WDM network. Normal procedure to calculate the network performance
always takes one assumption for granted - traffic transmission in underlying optical network is perfect. However, the
removal of SONET/SDH layer implies its error detection/correction function of is no longer used, which may result in
useless information received by destination node. We set up a model and present a three-step cross-layer approach for
analyzing the performance of IP/GMPLS over WDM network. The performance of IP traffic with and without
considering optical impairments are compared and the numerical results demonstrate the network metrics, in terms of
effective normalized throughput, are indeed affected by the characteristics of the underlying optical layer.
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