A method is proposed to recover the refractive index profile of graded waveguide from the effective indices by a cubic spline interpolation function. Numerical analysis of several typical index distributions show that...
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A method is proposed to recover the refractive index profile of graded waveguide from the effective indices by a cubic spline interpolation function. Numerical analysis of several typical index distributions show that the refractive index profile can be reconstructed closely to its exact profile by the presented interpolation model.
We propose a silicon polarization-diversity coherent receiver for wavelength-multiplexing transmission without using the large-footprint arrayed waveguide grating(AWG).We have integrated our proposed coherent receiver...
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We propose a silicon polarization-diversity coherent receiver for wavelength-multiplexing transmission without using the large-footprint arrayed waveguide grating(AWG).We have integrated our proposed coherent receiver on the silicon-on-insulator(SOI) platform for high-capacity *** the proposed coherent receiver,high-frequency photocurrent signals from other wavelengths are suppressed by electrical low-pass ***,the signal-signal beat interference(SSBI) generated from each wavelength is eliminated by the balanced *** two features lend to the proposed coherent receiver being free of the mm-scale *** have demonstrated our proposed coherent receiver to detect a 1.12-Tb/s wavelength-division-multiplexed and polarization-division-multiplexed 16-ary quadrature amplitude modulation(PDM-16-QAM) *** compact footprint of the silicon chip promises small-form-factor receivers for future ultra-high-capacity coherent communicationsystems that require a high integration level and low fabrication cost.
We propose an ultra-thin glass film coated with graphene as a new kind of surrounding material which can greatly enhance spontaneous emission rate(SER) of dipole emitter embedded in it. With properly designed paramete...
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We propose an ultra-thin glass film coated with graphene as a new kind of surrounding material which can greatly enhance spontaneous emission rate(SER) of dipole emitter embedded in it. With properly designed parameters,numerical results show that SER-enhanced factors as high as 1.286 9 106 can be achieved. The influences of glass film thickness and chemical potential/doping level of graphene on spontaneous emission enhancement are also studied in this paper. A comparison is made between graphene and other coating materials such as gold and silver to see their performances in SER enhancement.
The information-carrying programmable metasurfaces have found widespread applications in communication, sensing, and other related areas. However, there is a fundamental but unresolved problem,i.e., the rigorous under...
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The information-carrying programmable metasurfaces have found widespread applications in communication, sensing, and other related areas. However, there is a fundamental but unresolved problem,i.e., the rigorous understanding of the quantization of metasurface coding. Here, we theoretically investigate the performance difference between one-bit and continuous information-encoding metasurfaces. To this end,we derive analytical representations of system responses in various cases(single-input single-output, singleinput multiple-output, and multiple-input multiple-output). We analyze the impact of one-bit coding(in contrast to continuous coding) in terms of the resulting channel cross-talk and reduction of information capacity in various representative scenarios from wireless communication and holography. Our main finding indicates that the one-bit coding yields a satisfactory performance in most practical scenarios; we also show that in many cases there are smart ways to mildly relax optimization constraints in order to reduce the performance gap between the one-bit and continuous coding. We expect that our results can provide theoretical guidance for a large variety of metasurface-assisted information systems for electromagnetic waves and other wave phenomena.
Since the working conditions of classical and quantum signals are very different, how to effectively integrate classical and quantum communicationnetworks without affecting their respective performance has become a g...
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In distributed optical fiber Raman amplifiers, instantaneous pump power depletion is related to patterns of input DWDM signals and results in extra optical noise and crosstalk. This noise has different effects on non ...
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In distributed optical fiber Raman amplifiers, instantaneous pump power depletion is related to patterns of input DWDM signals and results in extra optical noise and crosstalk. This noise has different effects on non return to zero (NRZ) and return to zero (RZ) pulse forms. These phenomena are compared with present simulation results.
In this paper,we propose and demonstrate a2 9 2 optical Benes switching unit based on two nested silicon microring resonators(MRRs)monolithically integrated on a silicon-on-insulator(SOI)*** extinction ratios(ERs)of a...
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In this paper,we propose and demonstrate a2 9 2 optical Benes switching unit based on two nested silicon microring resonators(MRRs)monolithically integrated on a silicon-on-insulator(SOI)*** extinction ratios(ERs)of about 44.7/38.0 dB and low crosstalk values of about-37.5/-45.2 dB at cross/bar states are obtained with the fabricated *** operation principle is theoretically studied and the switching function is verified by system demonstration experiments with 10 and12.5 Gb/s non-return-to-zero(NRZ)*** switching speed on the order of gigahertz based on free carrier effect in silicon is also experimentally demonstrated.
A new wavelength reservation scheme is proposed the reconfiguration times of optical cross-connects （OXCs） for we consider the reconfiguration information of switch fabrics to mitigate the connection setup time and ...
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A new wavelength reservation scheme is proposed the reconfiguration times of optical cross-connects （OXCs） for we consider the reconfiguration information of switch fabrics to mitigate the connection setup time and minimize WDM optical networks in this study. In this scheme, in the signaling protocol, which is designated as the signaling with switch fabric status （SWFS）. Distributed reservation algorithms will reserve the wavelength with minimum of reconfiguration times of OXCs along the route. Simulation results indicate that the proposed schemes with switch fabrics status have shorter setup time, lower switching ratio as well as better blocking performance than those of the traditional classic schemes. Moreover, the proposed schemes with SWFS significantly reduce the number of switch fabrics that need to be reconfigured.
We explore all-optical wavelength conversion in a microdisk resonator integrated with interleaved p-n *** simulation based on temporal coupled mode theory is performed to study the free-carrier dynamics inside the ***...
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We explore all-optical wavelength conversion in a microdisk resonator integrated with interleaved p-n *** simulation based on temporal coupled mode theory is performed to study the free-carrier dynamics inside the *** reveals that the detuning of pump and probe frequencies and the carrier lifetime have a significant effect on the device *** result confirms that the conversion speed can be considerably improved by applying a reverse bias on the p-n *** conversion at 10 Gb/s data rate is achieved with a pump power of 5.41 dBm and a bias voltage of-6 V.
Dear editor,Distributed fiber-optic sensing(DFOS) technology has been widespread applications in many fields. It is mainly realized by analyzing three kinds of backscattering in optical fibers: Rayleigh, Brillouin, an...
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Dear editor,Distributed fiber-optic sensing(DFOS) technology has been widespread applications in many fields. It is mainly realized by analyzing three kinds of backscattering in optical fibers: Rayleigh, Brillouin, and Raman [1]. Conventionally,the sensing system can only measure one type of parameter:a static one like temperature and strain or a dynamic one like vibration. However, for several applications, such as railway safety monitoring systems, both static and dynamic parameters must be measured simultaneously not only for early warning applications but also for collecting static signals to perform long-term analysis.
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