Laser Frequency Combs for Coherent Optical Communications

Torres Company, Victor,1981Chalmers tekniska högskola,Chalmers University of Technology (författare)

Laser frequency combs with repetition rates on the order of 10 GHz and higher can he used as multi-carrier sources in wavelength-division multiplexing (WDM). They allow replacing tens of tunable continuous-wave lasers by a single laser source. In addition, the comb's line spacing stability and broadband phase coherence enable signal processing beyond what is possible with an array of independent lasers. Modern WDM systems operate with advanced modulation formats and coherent receivers. This introduces stringent requirements in terms of signal-to-noise ratio, power per line, and optical linewidth which can be challenging to attain for frequency comb sources. Here, we set quantitative benchmarks for these characteristics and discuss tradeoffs in terms of transmission reach and achievable data rates. We also highlight recent achievements for comb-based superchannels, including >10 Tb/s transmission with extremely high spectral efficiency, and the possibility to significantly simplify the coherent receiver by realizing joint digital signal processing. We finally discuss advances with microresonator frequency combs and compare their performance in terms of flatness and conversion efficiency against state-of-the-art electro-optic frequency comb generators. This contribution provides guidelines for developing frequency comb sources in coherent fiber-optic communication systems.

Schröder, Jochen,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jochens (författare)
Fülöp, Attila,1988Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)fulop (författare)
Mazur, Mikael,1990Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mazurm (författare)
Lundberg, Lars,1989Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lulars (författare)
Helgason, Òskar Bjarki,1989Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skarb (författare)
Karlsson, Magnus,1967Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)magkar (författare)
Andrekson, Peter,1960Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)andrekso (författare)
Chalmers tekniska högskola (creator_code:org_t)

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