Nonlinear polarization amplifiers in nonzero dispersion shifted fiber
View Patent ↗A broadband fiber transmission system includes a transmission line with at least one zero dispersion wavelength λ o and transmits an optical signal of λ. The transmission line includes a distributed Raman amplifier that amplifies the optical signal through Raman gain. One or more pump sources are included and operated at wavelengths λ p for generating a pump light to pump the Raman amplifier. λ is close to λ 0 and λ 0 is less than 1540 nm or greater than 1560 nm.
1. A broadband fiber transmission system, comprising:
a transmission line having at least a first zero dispersion wavelength λ 01 and a second zero dispersion wavelength λ 02 , the transmission line operable to transmit an optical signal comprising a wavelength λ, the transmission line including a Raman gain medium that amplifies the optical signal through Raman gain; and
one or more pump sources operated at wavelengths λ p for generating a pump light to pump the Raman amplifier, wherein λ 01 is separated from λ 02 by at least 50 nm.
2. The broadband fiber transmission system of claim 1 , wherein λ is within 30 nm of at least one of λ 01 and λ 02 .
3. The broadband fiber transmission system of claim 1 , wherein the optical signal has a wavelength λ in the range of 1430 nm and 1630 nm.
4. The broadband fiber transmission system of claim 1 , wherein the transmission line comprises at least a first optical fiber and a second optical fiber coupled to the first optical fiber.
5. The broadband fiber transmission system of claim 1 , wherein the transmission line comprises at least a first portion having a positive sign of dispersion and a second portion having a negative sign of dispersion.
6. The broadband fiber transmission system of claim 1 , wherein the Raman gain medium comprises a distributed Raman gain medium.
7. The broadband fiber transmission system of claim 1 , wherein the Raman gain medium comprises a discrete Raman gain medium.
8. The broadband fiber transmission system of claim 1 , wherein the pump light generated by the at least one pump source propagates in the Raman gain medium in a direction that is substantially opposite the direction that the optical signal propagates the Raman gain medium.
9. The broadband fiber transmission system of claim 1 , wherein λ comprises one of a plurality of signal wavelengths forming the optical signal.
10. The broadband fiber transmission system of claim 1 , wherein at least one of the one or more pump sources comprises a semiconductor laser.
11. A method of broadband amplification, comprising:
transmitting an optical signal comprising a wavelength λ within a broadband fiber transmission system comprising a transmission line having at least a first zero dispersion wavelength λ 01 and a second zero dispersion wavelength λ 02 , the transmission line including a Raman gain medium that amplifies an optical signal through Raman gain; and
pumping the Raman amplifier with pump light λ p , wherein λ 01 is separated from λ 02 by at least 50 nm.
12. The method of claim 11 , wherein λ is within 30 nm of at least one of λ 01 and λ 02 .
13. The method of claim 11 , wherein the optical signal has a wavelength λ in the range of 1430 nm and 1630 nm.
14. The method of claim 11 , wherein the Raman gain medium is a distributed Raman gain medium or a discrete Raman gain medium.
15. The method of claim 11 , wherein the transmission line comprises at least a first optical fiber and a second optical fiber coupled to the first optical fiber.
16. The method of claim 11 , wherein the transmission line comprises at least a first portion having a positive sign of dispersion and a second portion having a negative sign of dispersion.
17. The method of claim 11 , wherein the pump light propagates in the Raman gain medium in a direction that is substantially opposite the direction that the optical signal propagates the Raman gain medium.
18. The method of claim 11 , wherein λ comprises one of a plurality of signal wavelengths forming the optical signal.
19. The method of claim 11 , wherein at least one of the one or more pump sources comprises a semiconductor laser.
20. A broadband fiber transmission system, comprising:
a transmission line having at least a first zero dispersion wavelength λ 01 and a second zero dispersion wavelength λ 02 , the transmission line operable to transmit an optical signal comprising a wavelength λ, the transmission line including a Raman gain medium that amplifies the optical signal through Raman gain; and
one or more pump sources operated at wavelengths λ p for generating a pump light to pump the Raman amplifier, wherein λ is within 30 nm of at least one of λ 01 and λ 02 .
21. The broadband fiber transmission system of claim 20 , wherein λ 01 is separated from λ 02 by at least 50 nm.
22. The broadband fiber transmission system of claim 20 , wherein the Raman gain medium is a distributed Raman gain medium or a discrete Raman gain medium.
23. The broadband fiber transmission system of claim 20 , wherein the pump light generated by the at least one pump source propagates in the Raman gain medium in a direction that is substantially opposite the direction that the optical signal propagates the Raman gain medium.
24. The broadband fiber transmission system of claim 20 , wherein λ comprises one of a plurality of signal wavelengths forming the optical signal.
25. The broadband fiber transmission system of claim 24 , wherein at least some of the plurality of signal wavelengths have a wavelength in the range of 1430 nm and 1630 nm.
26. A method of broadband amplification, comprising:
transmitting an optical signal comprising a wavelength λ within a broadband fiber transmission system comprising a transmission line having at least a first zero dispersion wavelength λ 01 and a second zero dispersion wavelength λ 02 , the transmission line including a Raman gain medium that amplifies an optical signal through Raman gain; and
pumping the Raman amplifier with pump light λ p , wherein λ is within 30 nm of at least one of λ 01 and λ 02 .
27. The method of claim 26 , wherein the Raman gain medium is a distributed Raman gain medium or a discrete Raman gain medium.
28. The method of claim 26 , wherein the pump light propagates in the Raman gain medium in a direction that is substantially opposite the direction that the optical signal propagates the Raman gain medium.
29. The method of claim 26 , wherein λ comprises one of a plurality of signal wavelengths forming the optical signal.
30. The method of claim 29 , wherein at least some of the plurality of signal wavelengths have a wavelength in the range of 1430 nm and 1630 nm.