Research Of High-Efficiency All-Optical Signal Processing

All optical network(AON)is booming with the exponential growth in demand for the high speed and capacity network.In the AON,all the signal processing(such as transmission,multiplexing and wavelength conversion)will be finished without any photoelectric converter which makes it different from the electronic network and the hybrid opto-electronic network.In other word,the signal must be modulated,demodulated,amplified,regenerated and so on in optical domain.As a result,all-optical signal processing is an important part of the research of AON.The all-optical signal processing,a technique without any electrical signal,will handle the signals in the optical domain.It contains many techniques,such as optical modulation,optical multiplexing,all-optical amplification,all-optical regeneration,all-optical wavelength conversion and so on.Compared with electron,photon offers extremely fast response.So all-optical signal processing can overcome the speed bottle-neck caused by the electronic devices.In addition,all-optical signal processing reduces the system cost greatly and simplifies the equipment because there is no need for optical-electrical/electrical-optical(OE/EO)converters.Due to the features of high speed and low cost,it attracts more and more attention with the rapid development of AON.Among a lot of techniques of all-optical signal processing,our work focus on the cascade wavelength conversion technology and phase sensitive amplifier technology.In the paper,we investigate the conversion efficiency of the wavelength converter based on highly nonlinear fiber.However,the injected pump power is limited by the Stimulated Brillouin Scattering(SBS),where longer fiber always has lower threshold powers.Here,we proposed an all-optical wavelength converter with high conversion efficiency by cascading two different HNLFs.We simulated and experimentally achieved-8-dB conversion efficiency and good converted signal with negligible power penalties.Moreover,phase sensitive amplifiers are also been studied in this paper.Compared with other optical amplifiers(such as EDFAs and SOAs),it works without any amplifier spontaneous emission(ASE)noise based on the nonlinear effect----four wave mixing.Under fixed pump power condition,the gain will be influenced by the phase matching.So in the research of the phase sensitive amplifiers,we investigate the impacts of dispersion on the gain of amplifiers.In the work,we plot the curve of the signal in-phase gain versus the fiber dispersion by calculation and verify the optimal in-phase gain by simulating.In the paper,whether the high conversion efficiency of the cascade wavelength converter or the high gain of the phase sensitive amplifier,high efficiency makes them more competitive.In the age of development based on energy-saving,the research of high-efficiency all-optical signal processing will be more and more meaningful.