First demonstration of 1580 nm wavelength band WDM transmission for doubling usable bandwidth and suppressing FWM in DSF

Jinno, Masahiko; Sakamoto, T.; Kani, Jun‐ichi; Aisawa, S.; Oda, Kazuhiro; Fukui, Masaki; Ono, Hirotaka; Oguchi, Kimio

doi:10.1049/el:19970584

Cited by 68 publications

(15 citation statements)

References 4 publications

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“…The tremendous increase in traffic in the WDM networks has led to the need for extending the transmission bandwidth. Long wavelength band (L-band) EDFAs have been considered as most likely candidate to extend the WDM transmission bandwidth beyond C-band because of its higher four-wave mixing threshold in widely deployed dispersion shifted fibers and more flexible dispersion compensation [1]. Due to the low emission cross-section of erbium in the L-band, Lband EDFAs suffer from low efficiency.…”

Section: Introductionmentioning

confidence: 99%

Comparison of performances between partial double-pass and full double-pass systems in two-stage L-band EDFA

2004

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Abstract:The two-stage L-band EDFA with partial double-pass (DP) system is compared with the full DP system. The partial DP system has a higher gain and lower noise figure at small input signal power compared with the full DP system. The small signal gain and noise figure are obtained at about 31.2 dB and 6.2 dB, respectively, for the partial DP system. The reduction of gain in full DP system is due to the double-propagation of conventionalband amplified spontaneous emission in the short length erbiumdoped fiber at the first stage that causes gain-clamping effect to the system. The higher gain in the partial DP system contributes to the lower noise figure even compared with single-pass twostage system at small input signal powers. However, at high input signal powers, the lowest noise figure is observed for the singlepass system.

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Section: Introductionmentioning

confidence: 99%

Comparison of performances between partial double-pass and full double-pass systems in two-stage L-band EDFA

2004

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“…All of these eventually reach their limits, however, and the only option is to increase the spectral region utilized within the fibers. For this reason, much attention has been focused recently on the possibility of expanding from the conventional-band (C-band: 1530 to 1565 nm) into long-wavelength-band (L-band: 1570 to 1610 nm) [1][2].…”

Section: Introductionmentioning

confidence: 99%

Gain clamping in double-pass L-band EDFA

Harun

Samsuri²,

Ahmad³

2004

2004 IEEE Region 10 Conference TENCON 2004.

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Gain clamping in double-pass long-wavelength band erbium-doped fiber amplifier (L-band EDFA) is demonstrated using a ring resonator. This new design provides an improved gain characteristics as well as an efficient tune-ability. The gain is clamped at 11.5 dB with gain variation of less than 0.1 dB from input signal power of -40 to -6 dBm by setting the variable attenuation setting (VOA) at 8 dB. Also, the clamped-gain level can be controlled in the range from 4.7 to 20.9 dB by varying the VOA settings from 0 to 20 dB. However, the proposed gain-clamped amplifier suffers noise figure degradation as compared to open-ring amplifier due to the intense ring laser light, which counter-propagating through the EDF.

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“…The L-band EDFAs also reduce the impact of four-wave mixing in systems with dispersion-shifted fibers [2]. To date, much research effort has been spent on amplifier schemes to improve amplification characteristics such as gain, noise figure, saturation power, and so on [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Although accurate and efficient for small-scale electromagnetic problems, the MoM can be very time consuming due to the increase of the electrical size of circuits. Many developments have been proposed recently to speed up these computations: wavelet-based methods [2,3], the fast multipole method (FMM) [3], the impedance matrix localization (IML) method [3], and methods employing matrix manipulations such as the order recur- …”

Section: Introductionmentioning

confidence: 99%

Efficient and low‐noise gain‐flattened double‐pass L‐band erbium‐doped fiber amplifier

Harun

Ahmad

2003

Micro & Optical Tech Letters

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A new double-pass long-wavelength-band erbiumdoped fiber amplifier with enhanced noise figure characteristics is demonstrated by adding a short length of forward pumped erbiumdoped fiber (EDF) in front of the double-pass amplifier. By adding 7 m of EDF, the amplifier achieves a flat-gain output at about 34.2 dB with a gain variation of less than 1.3 dB at the wavelength region 1568 -1598 nm. The corresponding noise figures vary from 5.0 to 5.7 dB, which is improved by 1.7 to 7.5 dB over the flat-gain region, as compared to that of the conventional double-pass amplifier. This new amplifier with high gain and low noise figure can be useful as an inline amplifier in a wavelength division multiplexing transmission system.

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First demonstration of 1580 nm wavelength band WDM transmission for doubling usable bandwidth and suppressing FWM in DSF

Cited by 68 publications

References 4 publications

Comparison of performances between partial double-pass and full double-pass systems in two-stage L-band EDFA

Comparison of performances between partial double-pass and full double-pass systems in two-stage L-band EDFA

Gain clamping in double-pass L-band EDFA

Efficient and low‐noise gain‐flattened double‐pass L‐band erbium‐doped fiber amplifier

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