US 12,262,159 B2
Presetting equalizer for burst mode optical receiver
Doutje Van Veen, New Providence, NJ (US); and Vincent Houtsma, New Providence, NJ (US)
Filed by Nokia Solutions and Networks Oy, Espoo (FI)
Filed on Mar. 31, 2023, as Appl. No. 18/129,201.
Prior Publication US 2024/0334093 A1, Oct. 3, 2024
Int. Cl. H04Q 11/00 (2006.01); H04B 10/69 (2013.01); H04L 25/02 (2006.01)
CPC H04Q 11/0066 (2013.01) [H04L 25/022 (2013.01); H04B 10/6971 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of generating a plurality of N preset tap values for an equalizer element component of an optical receiver, the equalizer element configured to provide accurate recovery of burst mode data transmitted by a new optical transmitter, the method comprising:
retrieving time-based performance data associated with the new optical transmitter, including performance data previously obtained for direct transmission between the new optical transmitter and a known receiver (TDEC(0)) and performance data previously obtained for worst-case transmission of a maximum fiber length between the new optical transmitter and the known receiver (TDEC(max));
generating an inverse of TDEC(0) to create a transmitter frequency response FT(f);
creating a first plurality of N equalizer tap values for equalizing the transmitter frequency response FT(f);
determining a fiber network frequency response by subtracting the inverse of TDEC(0) from the inverse of TDEC(max), and creating a set of intermediate tap values therefrom;
retrieving stored channel length information for a measured fiber span between the new optical transmitter and the optical receiver installed within the optical network;
modifying the determined fiber network frequency response by a factor including the channel length information to create a fiber channel frequency response FF(f);
creating a second plurality of N equalizer tap values for equalizing the fiber channel frequency response FF(f);
obtaining a frequency response measurement FR(f) of the optical receiver installed within the optical network;
creating a third plurality of N equalizer tap values for equalizing the optical receiver frequency response FR(f); and
combining the first, second, and third pluralities of N equalizer tap values to create the plurality of N preset taps values for use by the equalizer element within the optical receiver.