Abstract
This paper proposed an approach to design an evenly spaced, 1.8 THz spectrally broad and 1.6 dB flat optical frequency comb (OFC) by exploiting the cross-phase modulation in highly nonlinear fiber. The OFC is realized by controlling the phase of the signals in two parallelly placed highly nonlinear fibers. The frequency and line spacing of the OFC can be tuned by simply varying the periodicity and central wavelength of input electrical and optical signal, respectively.
Highlights
The gradual increase in network traffic with 20% to 30% per year increases the demand for data transmission capacity [1,2,3]
Periodic optical pulses propagate through an optical delay line (ODL) which induces the optical delay of 0.8 ps and modifies the phase of a periodic optical signal [30] which is further followed by highly nonlinear fiber (HNLF)
The noise in the periodic ultra-short pulse directly affects the flatness of the frequency comb, which depends on the various aspects of design parameters like pump signal power, interaction length, effective area, and nonlinear refractive index coefficient
Summary
The gradual increase in network traffic with 20% to 30% per year increases the demand for data transmission capacity [1,2,3]. The future high-performance network needs to handle hundreds of wavelength channels at a time [6,7,8] This can be done using multiple parallel optical links. Many electro-optic modulators are required to increase the number of frequency lines which makes the system bulky, costly, and complex. The electro-optic modulator based OFC generators have better tunability and stability but requires precise control over multiple parameters of multiple RF signals simultaneously, making the system complex. Electro-optic modulator based OFC generators has less number frequency lines.
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