Reduction of FWM noise in WDM-based QKD systems using interleaved and unequally spaced channels

Yongmei Sun; Yishan Lu; Jianing Niu; Yuefeng Ji

doi:10.3788/COL201614.060602

Chinese Optics Letters, Volume. 14, Issue 6, 060602(2016)

Reduction of FWM noise in WDM-based QKD systems using interleaved and unequally spaced channels

Yongmei Sun^*, Yishan Lu, Jianing Niu, and Yuefeng Ji

State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, China

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Figures & Tables(9)

Fig. 1. WDM-based QKD system architecture. VOA: variable optical attenuator; BS: beam splitter; FM: Faraday mirror; PM: phase modulator; and NBF: narrow band filter.

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Fig. 2. Channel allocation in the UFS-iWDM scheme.

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Fig. 3. FWM power versus fiber length in the EFS-iWDM; (a) Psyn=0 dBm and (b) Psyn=−10 dBm.

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Fig. 4. FWM power versus frequency spacing in the EFS-iWDM; (a) Psyn=0 dBm and (b) Psyn=−10 dBm.

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Fig. 5. FWM power versus number of users in the EFS-iWDM; (a) Psyn=0 dBm and (b) Psyn=−10 dBm.

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Fig. 6. QBER versus frequency spacing; (a) the EFS-iWDM and (b) the UFS-iWDM.

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Fig. 7. QBER versus synchronization signal power per channel; (a) the EFS-iWDM and (b) the UFS-iWDM.

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Table 1. Main Parameters Used in the Simulation
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Table 1. Main Parameters Used in the Simulation
Parameter Value
$f_{s}$ 50–1000 GHz
$z$ 0–25 km
$P_{q}$ −82 dBm
$P_{syn}$ 0.1–2 mW
$P_{data}$ 0 dBm
$N$ 1–4
$f_{rep}$ 500 MHz
$μ$ 0.1
$V$ 97%
$P_{dark}$ $5 \times 10^{- 8}$
$η_{spd}$ 11%
$α$ 0.2 dB/km
$A_{0}$ 1.5 dB
$A_{d}$ 5 dB
$I_{s}$ 80–105 dB
$Δ t_{gate}$ 500 ps

Table 2. Frequency Spacing Assigned in UFS-iWDM
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Table 2. Frequency Spacing Assigned in UFS-iWDM
$N$ $f_{s} = n_{i} Δ f$ in UFS-iWDM
1 $n_{i} = 1$ , 2, and $Δ f = BW / 3$
2 $n_{i} = 3$ , 4, 5, 6, 2, and $Δ f = BW / 20$
3 $n_{i} = 9$ , 8, 4, 10, 5, 11, 7, 6, and $Δ f = BW / 60$
4 $n_{i} = 9$ , 13, 6, 10, 14, 7, 11, 15, 8, 12, 5, and $Δ f = BW / 110$

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Yongmei Sun, Yishan Lu, Jianing Niu, Yuefeng Ji. Reduction of FWM noise in WDM-based QKD systems using interleaved and unequally spaced channels[J]. Chinese Optics Letters, 2016, 14(6): 060602

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