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DAC-Free 320 Gb/s 2-carrier nyquist-space DP PAM-4 transmission by resonant InP MZM

: Aimone, A.; Berenguer, P.W.; Meuer, C.; Gruner, M.; Fischer, J.K.; Schubert, C.; Schell, M.


IEEE Photonics Technology Letters 28 (2016), No.7, pp.775-777
ISSN: 1041-1135
Journal Article
Fraunhofer HHI ()

We present a segmented Mach-Zehnder modulator, which allows for frequency equalization and narrow spectral shaping without the need of any high-resolution digital-to-analog converter and digital signal processing on the transmitter side. The spectral shaping is achieved with the use of resonant structures implemented in the InP chip. This novel component is employed to transmit 320 Gb/s over 80 km of standard single mode fiber on two subcarriers modulated with dual-polarization pulse-amplitude modulation-4. Thanks to the modulator spectral shaping, the spacing between the two subcarriers is as little as 50 GHz. With an overall occupied bandwidth of 100 GHz, the gross spectral efficiency is 3.2 bit/s/Hz.