Optical Transmitters without Driver Amplifiers—Optimal Operation Conditions
AbstractAn important challenge in optical communications is the generation of highest-quality waveforms with a Mach–Zehnder modulator with a limited electrical swing (Vpp). For this, we discuss, under limited Vpp, the influence of the waveform design on the root-mean-square amplitude, and thus, the optical signal quality. We discuss the influence of the pulse shape, clipping, and digital pre-distortion on the signal quality after the electrical-to-optical conversion. Our simulations and experiments, e.g., suggest that pre-distortion comes at the expense of electrical swing of the eye-opening and results in a lower optical signal-to-noise ratio (OSNR). Conversely, digital post-distortion provides operation with larger eye-openings, and therefore, provides an SNR increase of at least 0.5 dB. Furthermore, we find that increasing the roll-off factor increases the electrical swing of the eye-opening. However, there is negligible benefit of increasing the roll-off factor of square-root-raised-cosine pulse shaped signals beyond 0.4. The findings are of interest for single-channel intensity modulation and direct detection (IM/DD) links, as well as optical coherent communication links. View Full-Text
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Josten, A.; Baeuerle, B.; Bonjour, R.; Heni, W.; Leuthold, J. Optical Transmitters without Driver Amplifiers—Optimal Operation Conditions. Appl. Sci. 2018, 8, 1652.
Josten A, Baeuerle B, Bonjour R, Heni W, Leuthold J. Optical Transmitters without Driver Amplifiers—Optimal Operation Conditions. Applied Sciences. 2018; 8(9):1652.Chicago/Turabian Style
Josten, Arne; Baeuerle, Benedikt; Bonjour, Romain; Heni, Wolfgang; Leuthold, Juerg. 2018. "Optical Transmitters without Driver Amplifiers—Optimal Operation Conditions." Appl. Sci. 8, no. 9: 1652.
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