On Probabilistic Shaping of Quadrature Amplitude Modulation for the Nonlinear Fiber Channel · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1606.04073/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTOn Probabilistic Shaping of Quadrature Amplitude Modulation for the Nonlinear Fiber Channel — mentioned by rassibassihttps://news.ycombinator.com/item?id=19357877urn:hackerpapers:mention:1606.04073:19357877Mon, 11 Mar 2019 10:25:59 GMT<p>Recent graduate in Optical Communications here :) 1) The fiber is pretty thin, but there are several fibers combined in one transoceanic cable, see here https://en.wikipedia.org/wiki/Submarine_communications_cable. They don&#x27;t patch them, but splice the fibers. Patching introduces a little loss, so it should be avoided. 2) Not sure how deep they are buried, but I think to remember that the shore end of a submarine cable is better protected than the part in the deep ocean. Due to more ship traffic at the coast etc. 3) Good question. The loss of an optical fiber is roughly 0.2 dB/km. Across the…</p><p><a href="https://hackerpaper.kaipfister.de/p/1606.04073/">Paper and discussion history</a>. A mention is not an endorsement.</p>cs.IT