US 12,177,002 B2
Wavelength division multiplexing structure
Dong Wang, Beijing (CN); Dechao Zhang, Beijing (CN); Yunbo Li, Beijing (CN); Jiang Sun, Beijing (CN); Qian Cai, Beijing (CN); Yang Zhao, Beijing (CN); and Han Li, Beijing (CN)
Assigned to CHINA MOBILE COMMUNICATION CO., LTD RESEARCH INSTITUTE, Beijing (CN); and CHINA MOBILE COMMUNICATIONS GROUP CO., LTD., Beijing (CN)
Appl. No. 18/002,266
Filed by CHINA MOBILE COMMUNICATION CO., LTD RESEARCH INSTITUTE, Beijing (CN); and CHINA MOBILE COMMUNICATIONS GROUP CO., LTD., Beijing (CN)
PCT Filed Jun. 28, 2021, PCT No. PCT/CN2021/102855
§ 371(c)(1), (2) Date Dec. 17, 2022,
PCT Pub. No. WO2022/001989, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 202010619054.1 (CN), filed on Jun. 30, 2020.
Prior Publication US 2023/0344545 A1, Oct. 26, 2023
Int. Cl. H04J 14/02 (2006.01); G02B 6/293 (2006.01)
CPC H04J 14/03 (2023.08) [H04J 14/0221 (2013.01); G02B 6/2938 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A Wavelength Division Multiplexing (WDM) structure, comprising: a first wavelength division multiplexer and a second wavelength division multiplexer;
wherein each of the first wavelength division multiplexer and the second wavelength division multiplexer comprises N filtering units, a branch side interface connected to each of the filtering units, and a line side interface, N being a positive integer, each of the filtering units corresponds to one central wavelength, the line side interface of the first wavelength division multiplexer and the line side interface of the second wavelength division multiplexer are connected by an optical fiber;
the N filtering units are divided into multiple filtering unit groups based on a central wavelength corresponding to each of the filtering units, and the multiple filtering unit groups are cascaded in series, or, the multiple filtering unit groups are cascaded in a series-parallel combination, and filtering units in each filtering unit group are cascaded in series; and
wherein a cascade mode and/or cascade position corresponding to each of the filtering units in the first wavelength division multiplexer and the second wavelength division multiplexer is at least related to a central wavelength corresponding to the filtering unit, so that a total power budget of a channel corresponding to each central wavelength is less than or equal to a first power threshold, and a difference between total power budgets of respective channels corresponding to different central wavelengths is less than a second power threshold;
wherein pairwise channel insertion losses corresponding to different groups of central wavelengths in the first wavelength division multiplexer and the second wavelength division multiplexer are in non-uniform distribution;
pairwise channel insertion losses corresponding to a same group of central wavelengths in the first wavelength division multiplexer and the second wavelength division multiplexer are in relatively uniform distribution.