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Материалы X Международной научной конференции

Noise and Saturation Properties of Fiber Optical

Fiber Optical Parametric Amplifiers (FOPAs) are based on a highly efficient Four-wave Mixing process in highly nonlinearfibers and have gained a lot of interest since it was shown that ahigh gain can be obtained. They are multi-functional devices thatare not only limited to amplifying signals, but their wide range ofapplicability also include wavelength conversion, pulse-generation,optical sampling and also regeneration at very high bit-rates. Theforemost property that makes this amplifier unique is its very fastresponse time, which make the signal gain respond to any change inpump power almost instantaneously.The FOPA was long thought of as an ideal amplifier in terms of noiseperformance. We show, however, that the noise around the pump itselfis transferred to the signal. The fast response time makes thissource of noise particularly large compared with other amplifiersexhibiting similar properties. This leads to stringent requirementson the laser. In this thesis we have developed a theory for thenoise figure of FOPAs, both in single-pumped and dual-pumpedimplementations and show very good agreement with experimentalmeasurements.Furthermore, in order to launch the pump powers necessary for highgain, the pump sources need to be phase-modulated in order to reducethe effects of stimulated Brillouin scattering. This may introduceintensity fluctuations on to the signal and may therefore affect theamplifiers performance. We quantify this effects and also derivetheory of how it affects the bit-error rate (BER) in digital data.It is shown that its effect on the BER is much lower then previouslyexpected.Also, optical signal regeneration is based on a nonlinearrelationship between the input and output optical power. FOPAsexhibit such a relationship when operated in the saturated gainregime. We simplify previous gain saturation theories and presentexperimental measurements proving our theory. A simplifiedexpression is useful in the development of regenerators and in thedesign of multi-wavelength amplification, where cross gainsaturation may affect the amplifier performance

Noise and Saturation Properties of Fiber Optical

Fiber Optical Parametric Amplifiers (FOPAs) are based on a highly efficient Four-wave Mixing process in highly nonlinearfibers and have gained a lot of interest since it was shown that ahigh gain can be obtained. They are multi-functional devices thatare not only limited to amplifying signals, but their wide range ofapplicability also include wavelength conversion, pulse-generation,optical sampling and also regeneration at very high bit-rates. Theforemost property that makes this amplifier unique is its very fastresponse time, which make the signal gain respond to any change inpump power almost instantaneously.The FOPA was long thought of as an ideal amplifier in terms of noiseperformance. We show, however, that the noise around the pump itselfis transferred to the signal. The fast response time makes thissource of noise particularly large compared with other amplifiersexhibiting similar properties. This leads to stringent requirementson the laser. In this thesis we have developed a theory for thenoise figure of FOPAs, both in single-pumped and dual-pumpedimplementations and show very good agreement with experimentalmeasurements.Furthermore, in order to launch the pump powers necessary for highgain, the pump sources need to be phase-modulated in order to reducethe effects of stimulated Brillouin scattering. This may introduceintensity fluctuations on to the signal and may therefore affect theamplifiers performance. We quantify this effects and also derivetheory of how it affects the bit-error rate (BER) in digital data.It is shown that its effect on the BER is much lower then previouslyexpected.Also, optical signal regeneration is based on a nonlinearrelationship between the input and output optical power. FOPAsexhibit such a relationship when operated in the saturated gainregime. We simplify previous gain saturation theories and presentexperimental measurements proving our theory. A simplifiedexpression is useful in the development of regenerators and in thedesign of multi-wavelength amplification, where cross gainsaturation may affect the amplifier performance

Penalties due to the combined effects of amplitude noise and timing-jitter with application to a 40 Gbit/s DM-soliton system

We derive equations for penalties introduced by the combined effects of timing-jitter and amplitude noise in a transmission link. We then apply the results on a DM-soliton system operating at 40 Gbit/s, where Gordon-Haus-jitter is important at large distances. We predict, using the theory, the maximum transmission distance for various systems. Finally, we compare the theory with numerical simulations and find a good agreement between them

Penalties due to the combined effects of amplitude noise and timing-jitter with application to a 40 Gbit/s DM-soliton system

We derive equations for penalties introduced by the combined effects of timing-jitter and amplitude noise in a transmission link. We then apply the results on a DM-soliton system operating at 40 Gbit/s, where Gordon-Haus-jitter is important at large distances. We predict, using the theory, the maximum transmission distance for various systems. Finally, we compare the theory with numerical simulations and find a good agreement between them