Increasing the density of modes in an optical frequency comb by cascaded four-wave mixing in a nonlinear optical fiber

TY - JOUR

T1 - Increasing the density of modes in an optical frequency comb by cascaded four-wave mixing in a nonlinear optical fiber

AU - Karki, Khadga J.

N1 - Publisher Copyright: © 2017 American Physical Society.

PY - 2017/10/2

Y1 - 2017/10/2

N2 - Here, it is shown that when two optical frequency combs with identical mode spacing but different offset frequencies copropagate through a nonlinear optical fiber, four-wave mixing between them generates new modes. Although the spacings between the new modes depend on the difference of the offset frequencies, they appear irregular because of the large number of possible four-wave-mixing processes. However, when the difference in the offset frequencies is an integer fraction of the mode spacing of the original combs, the cascaded four-wave mixing generates a new comb with a fixed mode spacing given by the difference in the offset frequencies. This process can be used to substantially increase the mode density of a frequency comb. The method can be used in conjunction with new sources of frequency combs, such as quantum cascade lasers and microresonators, which have large mode spacing of tens of GHz. Decreasing the mode spacing of such sources is likely to increase their applicability.

AB - Here, it is shown that when two optical frequency combs with identical mode spacing but different offset frequencies copropagate through a nonlinear optical fiber, four-wave mixing between them generates new modes. Although the spacings between the new modes depend on the difference of the offset frequencies, they appear irregular because of the large number of possible four-wave-mixing processes. However, when the difference in the offset frequencies is an integer fraction of the mode spacing of the original combs, the cascaded four-wave mixing generates a new comb with a fixed mode spacing given by the difference in the offset frequencies. This process can be used to substantially increase the mode density of a frequency comb. The method can be used in conjunction with new sources of frequency combs, such as quantum cascade lasers and microresonators, which have large mode spacing of tens of GHz. Decreasing the mode spacing of such sources is likely to increase their applicability.

UR - http://www.scopus.com/inward/record.url?scp=85031314888&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.96.043802

DO - 10.1103/PhysRevA.96.043802

M3 - 文章

AN - SCOPUS:85031314888

SN - 2469-9926

VL - 96

JO - Physical Review A

JF - Physical Review A

IS - 4

M1 - 043802

ER -