Abstract
All-optical multicasting of performing data routing from single node to multiple destinations in the optical domain is promising for next generation ultrahigh-peed photonic networks. Based on the self-phase modulation in dispersion flattened highly nonlinear photonic crystal fiber and followed spectral filtering, simultaneous 1-to-8 all-optical wavelength multicasting return-to-zero (RZ) signal at 20 Gbit/s with 100 GHz channel spaced is achieved. Wavelength tunable range and dynamic characteristic of proposed wavelength multicasting scheme is further investigated. The results show our designed scheme achieve operation wavelength range of 25 nm, OSNR of 32.01 dB and Q factor of 12.8. Moreover, the scheme has simple structure as well as high tolerance to signal power fluctuation.
Highlights
All-optical wavelength multicasting is an important function for increasing the efficiency and flexibility of wavelengthdivision-multiplexing/optical time division multiplexing (WDM/OTDM) optical networks, which involves transmitting a message from a source to multiple destinations simultaneously and has become the subject of intensive studies [1, 2]
The experimental setup for our all-optical wavelength multicasting scheme is illustrated in Figure 1, which basically consists of a high power erbium doped fiber amplifier (HPEDFA), a 100 m DF-HNL-PCF, and an optical band-pass filter (OBPF)
The pulses with wavelength at λsignal = 1555.2 nm from an actively mode-locked semiconductor laser are modulated by a LiNbO3 modulator at 10 Gbit/s 231-1 bits pseudorandom binary sequences (PRBS) with a polarization controller (PC) at its input to align the state of polarization of the pulse train with the transmission axis of the modulator and fed into a fiber-based interleaver that performs optical time division multiplexing to produce a 20 Gbit/s optical pulse signal for using in the experiments of all-optical wavelength multicasting
Summary
All-optical wavelength multicasting is an important function for increasing the efficiency and flexibility of wavelengthdivision-multiplexing/optical time division multiplexing (WDM/OTDM) optical networks, which involves transmitting a message from a source to multiple destinations simultaneously and has become the subject of intensive studies [1, 2]. A variety of all-optical multicasting technologies has been demonstrated, such as using cross-gain modulation (XGM) [5], cross-phase modulation (XPM) [6], four-wave mixing (FWM) [7], and nonlinear polarization rotation (NPR) [8] in semiconductor optical amplifiers (SOAs), cross-absorption modulation (XAM) [9] in electro-absorption modulators (EAMs), cascaded sum- and difference-frequency generation in a periodically poled lithium niobate (PPLN) waveguide [10, 11], FWM in conventional dispersion-shifted highly nonlinear optical fibers (HNLFs) [12,13,14] or dispersion-flattened highly nonlinear photonic crystal fiber (DF-HNL-PCF) [15], and transient cross-phase modulation in DF-HNL-PCF [16] All these schemes have their respective drawbacks. From the viewpoint of engineering applications, the operation wavelength range is an important issue in the design of wavelength multicasting schemes, which can affect the capacity of WDM/OTDM systems and the performance of wavelength switching/routing
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