Scattering Effects on QKD Employing Simultaneous Classical and Quantum Channels in Telecom Optical Fibers in the C-band

Xavier, G. B.; Faria, G. Vilela de; Temporão, Guilherme P.; Weid, J. P. von der

doi:10.1063/1.3131339

Cited by 8 publications

(8 citation statements)

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“…Since the contribution for the SRS changes linearly with data channels power [4], [11], [20], we performed another set of simulations to determine the maximum achievable distance as a function of this power. The power for each classical telecom channel was varied from −10 to 0 dBm and different filtering bandwidths (100 and 10 GHz FWHM) were considered.…”

Section: A Resultsmentioning

confidence: 99%

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Impact of Raman Scattered Noise from Multiple Telecom Channels on Fiber-Optic Quantum Key Distribution Systems

Silva

Xavier

Temporão

et al. 2014

J. Lightwave Technol.

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In this paper, we analyze the impact of the spontaneous Raman scattered noise generated from multiple optical classical channels on a single quantum key distribution channel, all within the telecom C-band. We experimentally measure the noise generated from up to 14 continuous-wave laser sources with different wavelengths using the dense wavelength division multiplexing (DWDM) standard, in both propagation directions in respect to the QKD channel, over different standard SMF-28 fiber lengths. We then simulate the expected secure key generation rate for a decoystates-based system as a function of distance under the presence of simultaneous telecom traffic with different modulation techniques, and show a severe penalty growing with the number of classical channels present. Our results show that, for in-band coexistence, the telecom channels should be distributed as close as possible from the quantum channel to avoid the Raman noise peaks. Operation far from the zero dispersion wavelength of the fiber is also beneficial as it greatly reduces the generation of four-wave mixing inside the quantum channel. Furthermore, narrow spectral filtering on the quantum channels is required due to the harsh limitations of performing QKD under real telecom environments, with the quantum and several classical channels coexisting in the same ITU-T C-band.Index Terms-Optical fiber communication, quantum key distribution (QKD), Raman scattering, wavelength division multiplexing (WDM) networks.

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Section: A Resultsmentioning

confidence: 99%

“…This measurement is performed with a tunable laser source (TLS) injected into the fiber at different wavelengths in the S, C, L, and U-bands, while the quantum channel, fixed at 1546.12 nm was monitored [20], as depicted in Fig. 1.…”

Section: A Single Channelmentioning

confidence: 99%

Impact of Raman Scattered Noise from Multiple Telecom Channels on Fiber-Optic Quantum Key Distribution Systems

Silva

Xavier

Temporão

et al. 2014

J. Lightwave Technol.

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“…With an LO photon number of 4 × 10 8 , the electrical noise of the homodyne detector is 10 dB below the shot noise. 9 In GMCS QKD, Alice and Bob estimate Eve's information from the observed excess noise and other system parameters. A higher noise indicates more information leakage and thus a lower secure key rate.…”

Section: Preliminary Experimental Results With a 100 Mhz Homodyne Detmentioning

confidence: 99%

“…The coexistence architecture based on wavelength-division-multiplexing (WDM) technology was proposed by Townsend in the late nineties [7] and has been studied thereafter [6,8,9,10,11]. These studies show that the existence of strong classical traffic could be detrimental to the QKD channel.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of quantum key distribution through a dense wavelength division multiplexing network

Qi¹,

Zhu²,

Qian³

et al. 2010

New J. Phys.

168

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A balanced homodyne detector for highrate Gaussian-modulated coherent-state quantum key distribution Yue-Meng Chi, Bing Qi, Wen Zhu et al.Quantum key distribution and 1 Gbps data encryption over a single fibre P Eraerds, N Walenta, M Legré et al. Abstract. In this paper, we study the feasibility of conducting quantum key distribution (QKD) together with classical communication through the same optical fiber by employing dense-wavelength-division-multiplexing (DWDM) technology at telecom wavelength. The impact of classical channels on the quantum channel has been investigated for both QKD based on single-photon detection and QKD based on homodyne detection. Our studies show that the latter can tolerate a much higher level of contamination from classical channels than the former. This is because the local oscillator used in the homodyne detector acts as a 'mode selector', which can suppress noise photons effectively. We have performed simulations based on both the decoy BB84 QKD protocol and the Gaussian-modulated coherent state (GMCS) QKD protocol. While the former cannot tolerate even one classical channel (with a power of 0 dBm), the latter can be multiplexed with 38 classical channels (0 dBm power per channel) and still has a secure distance around 10 km. A preliminary experiment has been conducted based on a 100 MHz bandwidth homodyne detector.

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“…This is the minimum power level that guaranteed a classical BER free of errors with our experimental setup. Note that this is far below the usual value for input powers for telecom systems (0 dBm), but without doing so Raman scattering‐induced noise increases by a factor of ∼95 as it increases linearly with input power [16]. The DWDMs used by both Alice and Bob are identical have more than 40 dB isolation between adjacent channels and ∼1.6 dB insertion loss each.…”

Section: Methodsmentioning

confidence: 99%

Active polarization control for quantum communication in long‐distance optical fibers with shared telecom traffic

Xavier

Faria

Silva

et al. 2011

Micro & Optical Tech Letters

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a combination of radiated susceptibility plus conducted susceptibility. Sensors with cables of ECG equipments are so sensitive and open to be distorted. These induced current is then driving through electronics by conduction mechanisms. CONCLUSIONSABSTRACT: We experimentally demonstrate the compatibility of wavelength multiplexed active polarization stabilization for quantum communication in an optical fiber carrying telecom traffic. One of the feedback control channels contains a 9.953 Gb/s datastream generated from a BER meter. We verify the ability to transmit single-photons in the two opposite directions of a 23-km optical fiber spool, while maintaining their state of polarization stable and a classical BER in the feedback channel error-free, during 6 h of continuous operation.ABSTRACT: This letter deals with a GaAs monolithic microwave integrated circuit (MMIC) Doherty power amplifier (DPA) for X-band systems. To the best of authors' knowledge, it represents the first DPA realization in the X-band frequency range. Experimental results showed a 30-dBm saturated output power and a drain efficiency greater than 53% at 9.5 GHz. Moreover, in the 6-dB power back-off (from 18 to 24 dBm input power), an amplitude modulation (AM/AM) distortion lower than 1 dB is also demonstrated with an average efficiency greater than 50%.

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Scattering Effects on QKD Employing Simultaneous Classical and Quantum Channels in Telecom Optical Fibers in the C-band

Cited by 8 publications

References 0 publications

Impact of Raman Scattered Noise from Multiple Telecom Channels on Fiber-Optic Quantum Key Distribution Systems

Impact of Raman Scattered Noise from Multiple Telecom Channels on Fiber-Optic Quantum Key Distribution Systems

Feasibility of quantum key distribution through a dense wavelength division multiplexing network

Active polarization control for quantum communication in long‐distance optical fibers with shared telecom traffic

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