Summary

  • Transcelestial has targeted the performance of Centauri versus older Free Space Optics (FSO) solutions by focusing on improvements in SWaP (Size, Weight, and Power).
  • With the use of the 1550nm wavelength for transmitting and receiving data, Centauri devices experience less diffraction and attenuation from environmental factors
  • Transcelestial's devices also provide active onboard tracking and Adaptive Power Control (APC) to maintain better alignment between devices when they experience vibrations or other environmental events


In-Depth


Size, Weight, and Power (SWaP)

The last generation FSO devices were large in size, very heavy, and had huge power consumption requirements. CENTAURI is much smaller (size of a shoebox), weighs only 3kg and requires 25W to 32W of power (max). CENTAURI can even work off of solar cells.


Wavelength

In the past, FSO relied on the use of wavelengths between 780nm to 980nm. This spectrum is a near-visible infrared spectral region, which is cost-effective. Transcelestial uses 1550nm which suffers less absorption and diffraction (2-3 orders of magnitude) in the atmosphere, compared to the 780nm to 980nm spectrum range. This was a major downfall for older generations of FSO and severely hampered the ability to deal with basic atmospheric phenomena.


The use of the 1550nm wavelength also improves performance during sunrise and sunset as the solar spectra effect does not interfere with this wavelength as much as others. We apply additional optical filtering to prevent stray light from entering the device, making East-facing or West-facing deployments possible where these were not possible, before.


Vibration Compensation

Older generations of FSO faced significant challenges during heavy rain, including link drops caused by pole vibrations and sway created by rain & wind. These devices lacked high-speed active tracking and the ability to adjust in near-real-time to compensate for vibrations. However, with CENTAURI we have implemented active onboard tracking to compensate for pole vibrations and other environmental events.


Beam Width

CENTAURI‚Äôs laser beam width is much narrower than older FSO devices. A narrow beam allows more power-efficient transmission to the receiver. Using a more narrow beam also makes pointing and tracking more challenging, which our pointing and tracking technologies more than compensate for, to vastly improve our performance over older devices. 

The last generation of FSO devices lacked active tracking, and their beam width was very large (+5mrad). In order to comply with eye safety regulations, the signal had to disperse quickly and the range was drastically affected by rain and other weather events.


Adaptive Power Control (APC)

CENTAURI's Adaptive Power Control (APC) helps our devices adjust in real-time, autonomously, by understanding the change in weather through sensor fusion. CENTAURI automatically adjusts and enhances the link budget by pushing the right amount of power during such an event in order to compensate for increased dB/km losses.