US 12,395,244 B2
Optical fiber exhibiting low guided acoustic Brillouin scattering (GAWBS) noise and measurement thereof
Fatih Yaman, Princeton, NJ (US); Kohei Nakamura, Tokyo (JP); Takanori Inoue, Tokyo (JP); Eduardo Mateo Rodriguez, Tokyo (JP); Shinsuke Fujisawa, Princeton, NJ (US); Hussam Batshon, Neptune, NJ (US); Yoshihisa Inada, Tokyo (JP); and Takaaki Ogata, Tokyo (JP)
Filed by NEC Laboratories America, Inc., Princeton, NJ (US)
Filed on Dec. 1, 2021, as Appl. No. 17/540,132.
Claims priority of provisional application 63/141,068, filed on Jan. 25, 2021.
Claims priority of provisional application 63/120,357, filed on Dec. 2, 2020.
Prior Publication US 2022/0173808 A1, Jun. 2, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 10/07 (2013.01); H01S 3/30 (2006.01); H04B 10/2537 (2013.01); H04B 10/291 (2013.01); H04B 10/61 (2013.01)
CPC H04B 10/2537 (2013.01) [H01S 3/302 (2013.01); H04B 10/2916 (2013.01); H04B 10/07 (2013.01); H04B 10/61 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An arrangement for measuring guided acoustic Brillouin scattering (GAWBS) noise comprising:
a first laser configured to emit first laser light and a second laser configured to emit second laser light;
a first length of optical fiber that optically connects the first laser light to a first port of a coherent receiver;
a second length of optical fiber that optically connects the second laser light to a second port of the coherent receiver; and
a third length of optical fiber that optically connects the first length of optical fiber to the second length optical fiber such that a portion of the first laser light is redirected to the second length of optical fiber wherein it is mixed with the second laser light resulting in mixed laser light;
a fiber under test (FUT) that receives the mixed laser light from a section of the second length of optical fiber such that it is directed to the second port of the coherent receiver via another portion of the second optical fiber; and
the coherent receiver that generates 4 beating signals from light signals received at the first and second ports;
wherein the arrangement is configured to suppress a large carrier using band-pass filters and further configured such that the second laser light emitted from the second laser is outside of a GUIDED ACOUSTIC BRILLOUIN SCATTERING (GAWBS) window and both polarization components of GAWBS are simultaneously measured.