US 12,359,970 B2
Device and method for optical spectrum measurement
Frank Smyth, Dublin (IE); and Jules Braddell, Dublin (IE)
Assigned to PILOT PHOTONICS LTD., (IE)
Filed by Pilot Photonics Ltd., Dublin (IE)
Filed on Nov. 23, 2022, as Appl. No. 17/993,161.
Application 17/993,161 is a continuation of application No. 16/956,777, granted, now 11,513,005, previously published as PCT/EP2018/086679, filed on Dec. 21, 2018.
Claims priority of application No. 1721753 (GB), filed on Dec. 22, 2017.
Prior Publication US 2023/0349760 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01J 3/42 (2006.01); G01J 3/02 (2006.01); G01J 3/10 (2006.01); H01S 5/00 (2006.01); H01S 5/0687 (2006.01); H01S 5/12 (2021.01); H01S 5/40 (2006.01)
CPC G01J 3/42 (2013.01) [G01J 3/0218 (2013.01); G01J 3/10 (2013.01); H01S 5/0078 (2013.01); H01S 5/0687 (2013.01); H01S 5/12 (2013.01); H01S 5/4012 (2013.01); H01S 5/4087 (2013.01); G01J 2003/106 (2013.01); G01J 2003/423 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A device comprising a first tunable comb laser source and a second tunable comb laser source whereby the wavelength of each comb laser source is chosen such that the combination of the two sources provides a continuous spectral coverage over a band in an optical spectrum under a selected wavelength tuning condition,
wherein the wavelength of each comb is a fixed wavelength and the output of each comb source is split into two bands using an optical splitter and at least one optical filter such that only a limited number of comb laser lines on either side of the central wavelength of either comb is present at an output,
wherein the output of the combined comb lasers, the optical splitter and the optical filter for each laser source are recombined using an optical coupler such that four bands of optical comb laser lines together operate as an output signal as a single comb source with no gaps in the coverage of the optical spectrum band under a selected tuning condition.