Method and system for waveguide mode filters
View Patent ↗A method and system for waveguide mode filters are disclosed and may include processing optical signals of a fundamental mode and higher-order modes by filtering the higher-order modes in rib waveguides in a photonic chip. The higher-order modes may be filtered utilizing doped regions and/or patterns in one or more slab sections in the rib waveguides. The patterns may be periodic or aperiodic along the rib waveguides. The higher-order modes may be filtered utilizing varying widths of slab sections, or doped, patterned, and/or salicided ridges on the slab sections in the rib waveguides. The higher-order modes may be attenuated by scattering and/or absorbing the modes. The chip may comprise a CMOS photonic chip.
1. A method for processing optical signals, the method comprising:
in a chip comprising a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes:
filtering said one or more higher-order modes utilizing doped regions in one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate.
2. The method according to claim 1 , comprising filtering said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides.
3. The method according to claim 2 , wherein said patterns are periodic along said one or more rib waveguides.
4. The method according to claim 2 , wherein said patterns are aperiodic along said one or more rib waveguides.
5. The method according to claim 1 , comprising filtering said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
6. The method according to claim 1 , comprising filtering said one or more higher-order modes utilizing doped ridges formed on one or more slab sections in said one or more rib waveguides.
7. The method according to claim 1 , comprising filtering said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
8. The method according to claim 1 , comprising filtering said one or more higher-order modes by scattering said higher-order modes.
9. The method according to claim 1 , comprising filtering said one or more higher-order modes by absorbing said higher-order modes.
10. The method according to claim 1 , comprising filtering said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides.
11. The method according to claim 1 , wherein said chip comprises a CMOS photonic chip.
12. A system for processing optical signals, the system comprising:
a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes, said one or more rib waveguides being operable to:
filter said one or more higher-order modes utilizing doped regions in one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate through said one or more rib waveguides.
13. The system according to claim 12 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides.
14. The system according to claim 13 , wherein said patterns are periodic along said one or more rib waveguides.
15. The system according to claim 13 , wherein said patterns are aperiodic along said one or more rib waveguides.
16. The system according to claim 12 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
17. The system according to claim 12 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing doped ridges formed on one or more slab sections in said one or more rib waveguides.
18. The system according to claim 12 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
19. The system according to claim 12 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by scattering said higher-order modes.
20. The system according to claim 12 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by absorbing said higher-order modes.
21. The system according to claim 12 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides.
22. The system according to claim 12 , wherein said chip comprises a CMOS photonic chip.
23. A method for processing optical signals, the method comprising:
in a chip comprising a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes:
filtering said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate, wherein said patterns are aperiodic along said one or more rib waveguides.
24. The method according to claim 23 , comprising filtering said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
25. The method according to claim 23 , comprising filtering said one or more higher-order modes utilizing doped ridges formed on one or more slab sections in said one or more rib waveguides.
26. The method according to claim 23 , comprising filtering said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
27. The method according to claim 23 , comprising filtering said one or more higher-order modes by scattering said higher-order modes.
28. The method according to claim 23 , comprising filtering said one or more higher-order modes by absorbing said higher-order modes.
29. The method according to claim 23 , comprising filtering said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides.
30. The method according to claim 23 , wherein said chip comprises a CMOS photonic chip.
31. A system for processing optical signals, the system comprising:
a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes, said one or more rib waveguides being operable to:
filter said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate through said one or more rib waveguides, wherein said patterns are aperiodic along said one or more rib waveguides.
32. The system according to claim 31 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
33. The system according to claim 31 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing doped ridges formed on one or more slab sections in said one or more rib waveguides.
34. The system according to claim 31 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
35. The system according to claim 31 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by scattering said higher-order modes.
36. The system according to claim 31 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by absorbing said higher-order modes.
37. The system according to claim 31 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides.
38. The system according to claim 31 , wherein said chip comprises a CMOS photonic chip.
39. A method for processing optical signals, the method comprising:
in a chip comprising a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes:
filtering said one or more higher-order modes utilizing doped ridges formed on one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate.
40. The method according to claim 39 , comprising filtering said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides.
41. The method according to claim 40 , wherein said patterns are periodic along said one or more rib waveguides.
42. The method according to claim 39 , comprising filtering said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
43. The method according to claim 39 , comprising filtering said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
44. The method according to claim 39 , comprising filtering said one or more higher-order modes by scattering said higher-order modes.
45. The method according to claim 39 , comprising filtering said one or more higher-order modes by absorbing said higher-order modes.
46. The method according to claim 39 , comprising filtering said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides.
47. The method according to claim 39 , wherein said chip comprises a CMOS photonic chip.
48. A system for processing optical signals, the system comprising:
a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes, said one or more rib waveguides being operable to:
filter said one or more higher-order modes utilizing doped ridges formed on one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate through said one or more rib waveguides.
49. The system according to claim 48 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides.
50. The system according to claim 49 , wherein said patterns are periodic along said one or more rib waveguides.
51. The system according to claim 48 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
52. The system according to claim 48 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
53. The system according to claim 48 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by scattering said higher-order modes.
54. The system according to claim 48 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by absorbing said higher-order modes.
55. The system according to claim 48 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides.
56. The system according to claim 48 , wherein said chip comprises a CMOS photonic chip.
57. A method for processing optical signals, the method comprising:
in a chip comprising a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes:
filtering said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate.
58. The method according to claim 57 , comprising filtering said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides.
59. The method according to claim 58 , wherein said patterns are periodic along said one or more rib waveguides.
60. The method according to claim 57 , comprising filtering said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
61. The method according to claim 57 , comprising filtering said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
62. The method according to claim 57 , comprising filtering said one or more higher-order modes by scattering said higher-order modes.
63. The method according to claim 57 , comprising filtering said one or more higher-order modes by absorbing said higher-order modes.
64. The method according to claim 57 , wherein said chip comprises a CMOS photonic chip.
65. A system for processing optical signals, the system comprising:
a photonic circuit, said photonic circuit comprising one or more rib waveguides for processing optical signals, said one or more rib waveguides supporting a fundamental mode and one or more higher-order modes, said one or more rib waveguides being operable to:
filter said one or more higher-order modes utilizing salicided ridges formed on one or more slab sections in said one or more rib waveguides while allowing said fundamental mode to propagate through said one or more rib waveguides.
66. The system according to claim 65 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing patterns fabricated in one or more slab sections in said one or more rib waveguides.
67. The system according to claim 66 , wherein said patterns are periodic along said one or more rib waveguides.
68. The system according to claim 65 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing varying widths of one or more slab sections in said one or more rib waveguides.
69. The system according to claim 65 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes utilizing patterned ridges formed on one or more slab sections in said one or more rib waveguides.
70. The system according to claim 65 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by scattering said higher-order modes.
71. The system according to claim 65 , wherein said one or more rib waveguides are operable to filter said one or more higher-order modes by absorbing said higher-order modes.
72. The system according to claim 65 , wherein said chip comprises a CMOS photonic chip.