This paper focuses on the experimental demonstration of all-optical wavelength conversion at 10 Gbit/s based on cross-bias modulation (XBM) in electroabsorption modulators (EAMs). It is shown that the input 1552 nm pump signal can be converted to 1562.2 nm at 10 Gbit/s by XBM. The optical spectra of both the pump and the probe signals after wavelength conversion is given and the eye diagram of the converted signal is demonstrated. The advantages of the proposed wavelength conversion scheme are also discussed.
Chirped return-to-zero differential phase-shift keying (CRZ-DPSK) modulation format under different channel spacings is investigated and compared with RZ-DPSK in 40×40-Gbit/s dense wavelength-division multiplexing transmission systems. An optimization operation over a wide range of parameters, such as span input power, precompensation percent, and chirp parameter (only for CRZ-DPSK), is performed in the simulation. Simulation results show that CRZ-DPSK demonstrates better performance in transmission distance, nonlinear, and dispersion tolerance with wider channel spacing of 100 GHz. When the channel spacing is reduced to 75 GHz, a slight degradation is observed for CRZ-DPSK and the performances of both formats are acceptable. But when it is reduced from 75 GHz to 50 GHz, a clear degradation of the CRZ-DPSK performance is measured, but RZ-DPSK demonstrates no significant degradation.
This paper focuses on numerical performance comparison of three typical G.655 transmission fibers in a 40×40Gb/s dense wavelength-division-multiplexing (DWDM) transmission system operating in C-band using return-to-zero differential phase-shift keying (RZ-DPSK) modulation format and hybrid Raman erbium-doped fiber amplifier (EDFA) amplification. An optimization operation over parameters, such as span input power and pre-compensation percent, is performed in the simulation. Simulation results show that the optimum choice of fiber depends on the application requirements and type of the systems and there must be some tradeoffs. Large Effective Area Fiber (LEAF) demonstrates better performance synthetically considering Q-factor, nonlinear tolerance and dispersion tolerance, and all the three G.655 fiber types take on some superiority over the conventional G.652 fiber.
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