KEYWORDS: All optical switching, Optical switching, Tunable lasers, Field programmable gate arrays, Ultrafast phenomena, Modulation, Switching, Eye, Data transmission, Temperature control
The all-optical switching system can effectively solve problems such as transmission delay and bottleneck bandwidth. And it has significant advantages in reducing data center costs and improving its transmission characteristics. The basic idea of this study is to achieve ultra-low power consumption, ultra-low latency, and ultra-low cost switching networks through the all-optical switching system. Due to the advantages of high bandwidth and low loss, all-optical switching system are expected to replace the existing electric switching communication network in Data Center. For this system, we produced a fast tunable laser array (C-band, 16-channel, 100 GHz-space) with a switching delay of 5 ns. Each wavelength is within the error range of the channel wavelength stipulated by the Dense Wavelength Division Multiplexing (DWDM) under the ITU-T channel standard during tuning. Based on the above-mentioned laser sources, the drive control unit of the array-type tunable DFB laser was prepared, and a DWDM all-optical switching system test bed with an arrayed waveguide grating router as the core was built. Define the above laser, drive control unit and modulator as a node that can achieve arbitrary routing in the all-optical switching system mentioned above through wavelength control. A stable data switching and transmission of 20.48 Gb/s is demonstrated, in which four nodes with four different wavelengths are adopted, and full cross routes are realized.
To evaluate the effect of crosstalk caused by wavelength deviation of reconstruction-equivalent-chirp (REC) integrated multi-wavelength laser arrays (MWLAs) on an optical free-space communication system in which wavelength division multiplexing (WDM) is applied, we derive the model of power penalty caused by the wavelength deviation of REC-MWLAs and the bit error rate (BER) of the system under atmospheric turbulence and conduct a numerical simulation. The two adjacent channels in arranged REC laser arrays are defined as the analysis scope. We find that the power penalty is more sensitive to the deviation of the channel itself than the adjacent channel as the frequency shift increases from 0 to 50 GHz. The numerical relationship between the BER and power penalty is drawn to further investigate the tolerance for wavelength deviation under the requirements of BER < 10 − 6 and BER < 10 − 9. In addition, for a smaller deviation of 5 GHz of the analyzed channel, the linewidth compression of the REC laser can decrease the power penalty from 1.3 to 0.7 dB, improving the system performance and moderating the demands for deviation of REC-MWLAs, and the gemination of channel spacing does not evidently reduce the requirement for deviation. The results of this work demonstrate the feasibility of REC-MWLAs as the light source of WDM free-space communication systems under atmospheric turbulence and provide an effective reference for the allowable deviation in the design and testing of MWLAs.
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