2 thoughts on “Under the Atlantic Ocean, data zips at 100 Gbps”

  1. I’m sorry, but that is a misleading explanation of coherent vs. non-coherent transmission. Coherent transmission requires a local oscillator, in this case a laser at near the same wavelength*, at the receiver. The receiver then compares the received light with the local oscillator to extract the signal. (To be precise, the coherence refers using the carrier phase information from the light from the transmit laser = carrier signal). In non-coherent transmission, the carrier phase information is not required and the amplitude of the incoming light is used to decipher the signal.
    *Proximity to the carrier wavelength signifies whether the system is homodyne vs. vs. heterodyne. Suggest visiting this site for a much more detailed & likelier clearer explanation of coherent transmission.

  2. Although the cables now are optical and modern undersea robots do the work, does still having to rely on submarine cables to carry the bulk of the Internet traffic between land masses, 170 years after first invention, qualify as steampunk?

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