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Okay, I did a little more digging and it seems you're right eszed! Even undersea cables can increase their bandwidth, at least in some cases; seems to be depend
by staplung 2y ago
Okay, I did a little more digging and it seems you're right eszed! Even undersea cables can increase their bandwidth, at least in some cases; seems to be dependent on some modulation factors that I don't fully understand.
If I'm reading this right, BPSK - used on the longest transpacific cables - can't really be upgraded to have higher bandwidth but QPSK and other modulation schemes used for shorter distances can be (?).
- lxgr 2y agoBPSK and QPSK are modulation schemes, but the optical amplifiers used don't demodulate and re-modulate at all, so the modulation used is irrelevant.
- RoderickBeck 2y agoCorrect. Modulation is encoding the bits in different aspects of the light wave. The better the modulation scheme, the more expensive is the division multiplexing equipment.