Digital coherent detection and wavelength division multiplexing are promising technologies for achieving throughputs from 100 Gb/s to Tb/s order in optical satellite communications. The adoption of these technologies leads to the possibility of using high performance, low cost commercial off the shelf (COTS) components for satellite communications. In this paper, as COTS optical devices and a DSP-ASIC suitable for enabling 100 Gb/s/wavelength capacity, a micro integrable tunable laser assembly, a lithium niobate modulator, a micro intradyne coherent receiver (Micro ICR) and a DSP-ASIC for 100 Gb/s fiber optical communications were successively exposed to a total fluence of more than 4.0 × 1010 p/cm2 of 70 MeV protons. This fluence is equivalent to the total non-ionizing dose (TNID) and total ionizing dose (TID) experienced during 10 years in low earth orbit. The components were powered, and the performance of a 100 Gb/s signal was measured during irradiation to assess the single event effect (SEE). All components showed no degradation as a result of TNID/TID effects. On the other hand, the Micro ICR and DSP-ASIC showed SEEs which required power cycling of the components to recover their functionality. The SEE affecting the DSP-ASIC also increased the post forward error correction bit error ratio (BER), but the BER nevertheless remained sufficiently low in practice. These radiation test results show that these COTS components can be good candidates for use in satellite communications.
For high capacity free space optical (FSO) communication systems, expected be used to support extended coverage for the sixth generation mobile service, the digital coherent technology and wavelength division multiplexing used in optical fiber communications are promising technologies. These technologies can generate optical signals supporting Tb/s level capacity. However, to achieve the link budget required for Tb/s optical links, transmit power in the order of 100 W is required, and achieving 100 W power output with an optical fiber amplifier is challenging. In this work we propose parallel optical amplification of channel groups split out from the WDM signal, instead of amplification of the undivided WDM signal, and the transmission of the amplified signals as separate beams passed through multi-aperture optics. This configuration can reduce the required output power from the individual optical fiber amplifiers. We designed the FSO terminals for the proposed configuration with 3 transmitter apertures, such that the apertures fell within the directivity of the FSO receiver terminal. We evaluated the configuration in an outdoor experiment with a 500 m FSO link and wavelength division multiplexed real-time 100 Gb/s digital coherent QPSK signals. The experimental results show that the proposed configuration can increase the total capacity by 3 times, from 200 Gb/s to 600 Gb/s, without needing to increase the output power from the individual optical fiber amplifiers.
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