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| 2. |
- Andrekson, Peter, 1960, et al.
(författare)
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Nonlinearity-based all-optical sampling of ultrahigh-bandwidth optical signals
- 2004
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. ; 5596, s. 319-331
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Konferensbidrag (refereegranskat)abstract
- We demonstrate an all-optical waveform sampling system with simultaneous sub-mW optical signal sensitivity (20 dB SNR) and sub-picosecond temporal resolution over more than 60 nm optical bandwidth. The optical sampling was implemented by four-wave mixing in a 10 m highly nonlinear fiber using a sampling pulse source with a sampling pulse peak power of only 16 W. The sampling performance was evaluated in terms of sensitivity, temporal resolution and optical bandwidth with respect to fiber length, sampling pulse source wavelength offset from the zero-dispersion wavelength of the highly nonlinear fiber, sampling pulse peak power and walk-off due to chromatic dispersion. We also present a summary of the available methods to achieve polarization-independent optical sampling.
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| 3. |
- Li, Jie, 1967, et al.
(författare)
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0.5 Tbit/s eye-diagram measurement by optical sampling using XPM-induced wavelength shifting in highly nonlinear fiber
- 2003
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 16:2, s. 566-568
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Tidskriftsartikel (refereegranskat)abstract
- In this letter, we report on a novel all-optical sampling scheme using cross-phase modulation-induced wavelength shifting and optical filtering. Up to 500-Gb/s optical signal eye-diagram measurements have been demonstrated for the first time with a temporal resolution of 0.7 ps. Signal operational wavelength range covering basically the whole erbium-doped fiber amplifier gain range (1535-1569 nm) with temporal resolutions equal to or less than 1 ps was also demonstrated in the experiment. These results show that the sampling system is suitable for directly monitoring and evaluating ultrahigh bit-rate optical time-division multiplexed data at or above 160 Gb/s.
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| 5. |
- Li, Jie, 1966
(författare)
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Generation and Applications of Picosecond Pulses in High-Capacity Fiber Optic Systems
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis deals with short optical pulse generation from actively mode-locked Erbium-doped fiber ring lasers (ML-EFRL) and their applications in all-optical signal processing (optical sampling and switching) and transmission experiments for high-capacity fiber optic systems. In future ultra-high bit-rate optical time division multiplexed (OTDM) systems, one of the key requirements is to develop reliable optical pulse sources that can generate high quality optical pulses. ML-EFRLs are very attractive candidates in this respect. Such a laser system with a non-polarization-maintaining cavity has been built and characterized. This laser can generate 10 GHz transform-limited 0.7-1.3 ps, sech2-shaped pulses in the 1536-1569 nm wavelength region, with less than 0.1 ps RMS timing jitter and over 80 dB super-mode noise suppression. Despite the non-PM nature of the laser cavity, long-term stability can still be maintained by a fiber-stretcher-based cavity length maintaining feedback circuit. By using this ring laser as the sampling pulse source, two optical sampling schemes based on 50 m highly nonlinear fiber (HNLF) have been demonstrated. One scheme uses fiber parametric amplification, which has resulted in up to 300 Gb/s real-time eye-diagram measurements with 1.6 ps temporal resolution. A sensitivity of 10 mW and more than 30 nm operational optical bandwidth were also demonstrated. The other scheme is based on cross-phase modulation (XPM)-induced wavelength shifting and optical filtering, which has led up to 500 Gb/s eye-diagram measurements with a temporal resolution of 0.7 ps. Signal operational wavelength range covering the whole EDFA gain range (1535-1569 nm) was also demonstrated. Furthermore, by exploiting XPM-induced wavelength shifting in HNLF, all-optical demultiplexing of 160 Gb/s OTDM data and simultaneous time domain add-drop multiplexing at 80 Gb/s have been experimentally demonstrated. Further numerical simulations show that with proper signal and control pulse widths, simultaneous time domain add-drop multiplexing at 160 Gb/s or beyond is possible. Finally, nonlinear pulse transmissions that demonstrate soliton robustness to polarization-mode dispersion (PMD) and intra-channel four-wave mixing (FWM) suppression have been performed. The results show that at least for individual signal pulses, both conventional and dispersion managed (DM) solitons are indeed robust to PMD. It was also demonstrated that proper phase modulation is an effective method to suppress intra-channel FWM for strongly DM nonlinear transmission systems.
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| 8. |
- Mårtensson, Jonas, et al.
(författare)
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Improvement of Nonlinear Tolerance in 40 Gbit/s Transmission by Phase Modulation at 10 GHz
- 2002
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Ingår i: 2002 28TH European Conference on Optical Communication. - 8790974638
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Konferensbidrag (refereegranskat)abstract
- We propose to suppress intra-channel four-wave-mixing (IFWM) in 40 Gbit/s optical transmission by applying a phase modulation at 10 GHz. Both numerical simulations and experiments show that the penalty induced by IFWM is significantly reduced
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| 9. |
- Mårtensson, Jonas, et al.
(författare)
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Phase Modulation Schemes for Improving Intra-Channel Nonlinear Tolerance in 40 Gbit/s Transmission
- 2003
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Ingår i: Conference on Optical Fiber Communication, Technical Digest Series. - : Institute of Electrical and Electronics Engineers Inc.. ; , s. 662-663
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Konferensbidrag (refereegranskat)abstract
- Several schemes for suppressing infra-channel non-linearities by introducing phase shifts between pulses are compared. Simulations and experiments show that sinusoidal phase modulation at 10 GHz provides a simple and effective means for improving the nonlinear tolerance in 40 Gbit/s transmission.
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