-
Leif Katsuo Oxenløwe,
Fausto Gómez-Agis,
Cédric Ware,
Sunao Kurimura,
Hans Christian,
H Mulvad, Michael Galili,
Hirochika Nakajima,
Junichiro Ichikawa,
Didier Erasme,
Anders Thomas Clausen,
Palle Jeppesen
[show abstract]
[hide abstract]
ABSTRACT: This paper presents the first demonstration of the use of a periodically poled lithium niobate device for signal processing at 640 Gbit/s. Clock recovery is performed successfully using the lithium niobate device, and the clock signal is used to control a non-linear fiber-based demultiplexer. The full 640-Gbit/s system gives error-free performance with no pattern dependence and there is less than 1-dB power penalty after 50-km fiber transmission.
; 27(1).
-
[show abstract]
[hide abstract]
ABSTRACT: We experimentally demonstrate simultaneous all-optical regeneration of two 160-Gbit/s wavelength-division multiplexed (WDM) channels in a single highly nonlinear fiber (HNLF). The multi-channel regeneration performance is confirmed by bit-error rate (BER) measurements. The receiver powers at a BER of 10<sup>-9</sup> are improved by about 4.9 dB and 2.1 dB for the two channels, respectively. The BER performance is not degraded by the presence of a second channel. Mitigation of the inter-channel nonlinearities is achieved through bidirectional propagation.
Optics Express 02/2013; 21(3):2862-2868. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate experimentally and numerically an unexpected spectral asymmetry in the saturated-gain spectrum of single-pump fiber optical parametric amplifiers. The interaction between higher-order four-wave mixing products and dispersive waves radiated as an effect of third-order dispersion influences the energy transfer to the signal, depending on its detuning with respect to the pump, and breaks the symmetry of the gain expected from phase-matching considerations in unsaturated amplifiers. The asymmetry feature of the saturated spectrum is shown to particularly depend on the dispersion characteristics of the amplifier and shows local maxima for specific dispersion values.
Optics Express 07/2012; 20(14):15530-9. · 3.59 Impact Factor
-
Leif Oxenlowe,
Hans Christian Hansen Mulvad,
Hao Hu,
Hua Ji, Michael Galili,
Minhao Pu,
Kresten Yvind,
Jørn M. Hvam,
Palle Jeppesen,
Evarist Palushani,
Anders Clausen
[show abstract]
[hide abstract]
ABSTRACT: We describe recent demonstrations of exploiting highly nonlinear silicon waveguides for ultrafast optical signal processing. We describe wavelength conversion and serial-to-parallel conversion of 640 Gbit/s data signals and 1.28 Tbit/s demultiplexing and all-optical sampling
03/2012;
-
[show abstract]
[hide abstract]
ABSTRACT: An asynchronous 10 Gb/s Ethernet packet with maximum packet size of 1518 bytes is synchronized and retimed to a master clock with 200 kHz frequency offset using a time lens. The NRZ packet is simultaneously converted into an RZ packet, then further pulse compressed to a FWHM of 400 fs and finally time-division multiplexed with a serial 1.28 Tb/s signal including a vacant time slot, thus forming a 1.29 Tb/s time-division multiplexed serial signal. Error-free performance of synchronizing, retiming, time-division multiplexing to a Terabit data stream and finally demultiplexing back to 10 Gb/s of the Ethernet packet is achieved.
Optics Express 12/2011; 19(26):B931-7. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate a high-quality cavity-free 10 GHz 680 fs pulse source starting from a continuous wave (CW) laser. The pulse source is employed in a 640 Gbit/s on-off keying (OOK) OTDM data generation and demultiplexing experiment, where the error-free bit error rate (BER) performance confirms the high pulse quality. The pulse source is based on a linear pulse compression stage followed by two polarization-independent non-linear pulse compression stages. The linear pulse compression stage relies on a phase modulator, which is used to generate linear chirp and followed by a dispersive element to compensate the chirp. The non-linear pulse compression stages are based on self-phase modulation (SPM) in dispersion-flattened highly non-linear fibers (DF-HNLF). The pulse source is tunable over the C-band with negligible pedestal.
Optics Express 12/2011; 19(26):B343-9. · 3.59 Impact Factor
-
Hans Christian Hansen Mulvad,
Evarist Palushani,
Hao Hu,
Hua Ji,
Mads Lillieholm, Michael Galili,
Anders T Clausen,
Minhao Pu,
Kresten Yvind,
Jørn M Hvam,
Palle Jeppesen,
Leif K Oxenløwe
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate conversion from 64 × 10 Gbit/s optical time-division multiplexed (OTDM) data to dense wavelength division multiplexed (DWDM) data with 25 GHz spacing. The conversion is achieved by time-domain optical Fourier transformation (OFT) based on four-wave mixing (FWM) in a 3.6 mm long silicon nanowire. A total of 40 out of 64 tributaries of a 64 × 10 Gbit/s OTDM-DPSK data signal are simultaneously converted with a bit-error rate (BER) performance below the 2 × 10(-3) FEC limit. Using a 50 m long highly nonlinear fiber (HNLF) for higher FWM conversion efficiency, 43 tributaries of a 64 × 10 Gbit/s OTDM-OOK data signal are converted with error-free performance (BER<10(-9)).
Optics Express 12/2011; 19(26):B825-35. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We present WDM multicasting based on dual-pump four-wave mixing in a 3-mm long dispersion engineered silicon waveguide. One-to-six phase-preserving WDM multicasting of 10-Gb/s differential phase-shift-keying (DPSK) data is experimentally demonstrated with bit-error rate measurements. All the six multicast signals show error-free performance with power penalty less than 3.8 dB.
Optics Express 11/2011; 19(24):24448-53. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We have successfully demonstrated all-optical wavelength conversion of a 640-Gbit/s line-rate return-to-zero differential phase-shift keying (RZ-DPSK) signal based on low-power four wave mixing (FWM) in a silicon photonic chip with a switching energy of only ~110 fJ/bit. The waveguide dispersion of the silicon nanowire is nano-engineered to optimize phase matching for FWM and the switching power used for the signal processing is low enough to reduce nonlinear absorption from two-photon-absorption (TPA). These results demonstrate that high-speed wavelength conversion is achievable in silicon chips with high data integrity and indicate that high-speed operation can be obtained at moderate power levels where nonlinear absorption due to TPA and free-carrier absorption (FCA) is not detrimental. This demonstration can potentially enable high-speed optical networks on a silicon photonic chip.
Optics Express 10/2011; 19(21):19886-94. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: An asynchronous 10G Ethernet packet is synchronized and retimed to a master clock using a time lens. The NRZ packet is converted into an RZ packet and multiplexed with a serial 1.28 Tb/s signal.
09/2011;
-
[show abstract]
[hide abstract]
ABSTRACT: We propose and demonstrate the use of a single semiconductor optical amplifier (SOA) and optical filtering to time demultiplex tributaries from an optical time division multiplexing-differential phase shift keying (OTDM-DPSK) signal. The scheme takes advantage of the fact that phase variations added to the target channel by cross-phase modulation from the control signal are effectively subtracted in the differential demodulation scheme employed for DPSK signals. Demultiplexing from 80 to 40 Gbit/s is demonstrated with moderate power penalty using an SOA with recovery time twice as long as the bit period at 80 Gbit/s . Large dynamic ranges for the input power and SOA current are experimentally demonstrated. The scheme is expected to be scalable toward higher bit rates.
Optics Letters 05/2011; 36(9):1560–1562. · 3.40 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We propose and demonstrate the use of a single semiconductor optical amplifier (SOA) and optical filtering to time demultiplex tributaries from an optical time division multiplexing-differential phase shift keying (OTDM-DPSK) signal. The scheme takes advantage of the fact that phase variations added to the target channel by cross-phase modulation from the control signal are effectively subtracted in the differential demodulation scheme employed for DPSK signals. Demultiplexing from 80 to 40 Gbit/s is demonstrated with moderate power penalty using an SOA with recovery time twice as long as the bit period at 80 Gbit/s. Large dynamic ranges for the input power and SOA current are experimentally demonstrated. The scheme is expected to be scalable toward higher bit rates.
Optics Letters 05/2011; 36(9):1560-2. · 3.40 Impact Factor
-
Yunhong Ding,
Hao Hu, Michael Galili,
Jing Xu,
Liu Liu,
Minhao Pu,
Hans Christian Hansen Mulvad,
Leif Katsuo Oxenløwe,
Christophe Peucheret,
Palle Jeppesen,
Xinliang Zhang,
Dexiu Huang,
Haiyan Ou
[show abstract]
[hide abstract]
ABSTRACT: A 640 Gbit/s NRZ OTDM signal has been successfully generated for the first time by format conversion of a 640 Gbit/s OTDM signal from RZ to NRZ. First, a coherent 640 Gbit/s OTDM RZ signal is generated by wavelength conversion of the original incoherent OTDM signal utilizing Kerr switching in a highly nonlinear fiber. Second, RZ-to-NRZ format conversion is achieved in a specially designed silicon microring resonator with FSR of 1280 GHz, Q value of 638, high extinction ratio and low coupling loss to optical fiber. A 640 Gbit/s NRZ OTDM signal with very clear eye-diagram and narrower bandwidth than both the original incoherent 640 Gbit/s and the wavelength converted coherent 640 Gbit/s RZ OTDM signals has been obtained. Bit error ratio measurements show error free (<10(-9)) performance at a received power of -30 dBm for all the OTDM channels of the 640 Gbit/s NRZ signal, with very low power penalty (<0.5 dB) and improved dispersion tolerance compared to the wavelength converted RZ case.
Optics Express 03/2011; 19(7):6471-7. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report the first demonstration of polarisation insensitive all-optical wavelength conversion (AOWC) for single wavelength channel 640 Gbit/s return-to-zero differential-phase-shift-keying (RZ-DPSK) signal and 1.28 Tbit/s polarisation multiplexed (Pol-Mux) RZ-DPSK signals using a 100-m polarisation-maintaining highly nonlinear fiber (PM-HNLF) in a polarisation diversity loop configuration. The AOWC is based on four-wave mixing in PM-HNLF. Error free performance is achieved for the wavelength converted signals. Less than 0.5 dB polarisation sensitivity is obtained.
Optics Express 05/2010; 18(10):9961-6. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Error free and low penalty generation and detection of 2.56 Tbit/s serial data is demonstrated. 1.28 Tbaud pulses are modulated with DPSK and polarisation multiplexed to achieve 2.56 Tbit/s with record low penalty.
03/2010;
-
[show abstract]
[hide abstract]
ABSTRACT: Polarization-insensitive 640 Gbit/s demultiplexing for OTDM data signals is demonstrated using a 100 m polariza-tion-maintaining highly non-linear fibre. The scheme is based on four wave mixing (FWM) in a polarization-maintaining fibre loop (PMFL) with bidirectional operation. Less than 0.2 dB polariza-tion dependence is obtained. The FWM efficiency is about 6 dB if the passive loss of the PMFL is not included. The flatness characteristic of the FWM efficiencies allows for the OTDM de-multiplexing of a high speed signal with a bandwidth of 1.2 THz. Error free performance with low penalty for the demultiplexed 10 Gbit/s signal is achieved for the polarization scrambled 640 Gbit/s data signal. BER measurements and eye-diagrams show that the demultiplexed 10 Gbit/s signals with and without polarization scrambling have almost identical performance. Index Terms—Demultiplexing, four wave mixing, optical time division multiplexing (OTDM), polarization insensitive, polariza-tion-maintaining highly non-linear fibre.
01/2010; 28(15).
-
[show abstract]
[hide abstract]
ABSTRACT: We have generated a single-wavelength data signal with a data capacity of 5.1 Tbit/s. The enabling techniques to generate the data signal are optical time-division multiplexing up to a symbol rate of 1.28 Tbaud, differential quadrature phase shift keying as data format, and polarisation-multiplexing. For the first time, error-free performance with a bit error rate less than 10(-9) is demonstrated for the 5.1 Tbit/s data signal. This is achieved in a back-to-back configuration using a direct detection receiver based on polarisation- and time-demultiplexing, delay-demodulation and balanced photo-detection.
Optics Express 01/2010; 18(2):1438-43. · 3.59 Impact Factor
-
Michael Galili,
Jing Xu,
Hans C H Mulvad,
Leif K Oxenløwe,
Anders T Clausen,
Palle Jeppesen,
Barry Luther-Davis,
Steve Madden,
Andrei Rode,
Duk-Yong Choi,
Mark Pelusi,
Feng Luan,
Benjamin J Eggleton
[show abstract]
[hide abstract]
ABSTRACT: We report the first demonstration of error-free 640 Gbit/s demultiplexing using the Kerr non-linearity of an only 5 cm long chalcogenide glass waveguide chip. Our approach exploits four-wave mixing by the instantaneous nonlinear response of chalcogenide. Excellent performance is achieved with only 2 dB average power penalty and no indication of error-floor. Characterisation of the FWM efficiency for the chalcogenide waveguide is given and confirms the good performance of the device.
Optics Express 03/2009; 17(4):2182-7. · 3.59 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The authors report on a novel application of a (2) nonlinear optical device as an ultrafast phase comparator, an essential element that allows an optoelectronic phase-locked loop to perform clock recovery of ultrahigh-speed optical time-division multiplexed (OTDM) signals. Particular interest is devoted to a quasi-phase-matching adhered-ridge-waveguide periodically poled lithium niobate (PPLN) device, which shows a sufficient high temporal resolution to resolve a 640 Gbits OTDM signal. Index Terms—Clock recovery (CR), nonlinear optics, optical communication, optical phase matching, optical signal processing, optical time division multiplexing (OTDM), optoelectronic phase-locked loop (OEPLL), periodically poled lithium niobate (PPLN).
01/2009; 27(1).
-
Jing Xu, M. Galili,
H.C.H. Mulvad,
L.K. Oxenlowe,
A.T. Clausen,
P. Jeppesen,
B. Luther-Davis,
S. Madden,
A. Rode,
Duk-Yong Choi,
M. Pelusi,
Feng Luan,
B.J. Eggleton
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate error free, low-penalty demultiplexing of a 640 Gbit/s OTDM signal to 10 Gbit/s using a 5 cm long chalcogenide planar waveguide chip. Our approach exploits four-wave mixing by the instantaneous nonlinear response of chalcogenide.
Opto-Electronics and Communications Conference, 2008 and the 2008 Australian Conference on Optical Fibre Technology. OECC/ACOFT 2008. Joint conference of the; 08/2008
