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100 GBd IM/DD transmission over 14 km SMF in the C-band enabled by a plasmonic SSB MZM

Benedikt Baeuerle, Claudia Hoessbacher, Wolfgang Heni, Yuriy Fedoryshyn, Ueli Koch, Arne Josten, Delwin L. Elder, Larry R. Dalton, and Juerg Leuthold

Open Access Open Access

Abstract

100 Gb/s NRZ-OOK transmission over 14 km standard single mode fiber in the C-band is demonstrated with a simple intensity modulation and direct detection scheme. The transmission concept utilizes single sideband modulation and comprises a single differential digital-to-analog converter with adjustable phase offset, a new dual electrode plasmonic Mach-Zehnder modulator, a laser at 1537.5 nm, standard single mode fibers, a photodiode, an analog-to-digital converter, and linear offline digital signal processing. The presented SSB concept requires no DSP and complex signaling at the transmitter. The demonstrated SSB transmitter increased the possible transmission distance by a factor of 4.6 compared to a DSB transmitter. We also investigated the equalization requirements. A T/2-spaced feedforward equalizer requires 27 taps to achieve transmission over 10 km with a BER below the HD-FEC limit. In comparison to a DSB transmitter, the SSB transmitter reduced the receiver DSP complexity by a factor of 13.7.

© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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Figures (5)
Fig. 1.
Fig. 1. Colorized microscope picture of the dual-electrode plasmonic Mach-Zehnder modulator (P-MZM). It comprises MZ interferometer with silicon photonic (SiP) waveguides (WGs) and SiP multimode interference (MMI) couplers and two plasmonic phase modulators. Light is coupled to and from the chip via SiP grating couplers (GC). The electrical signal is contacted via two ground (G) signal (S) contact pads.

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Fig. 2.
Fig. 2. Normalized power spectrum. The spectral response of a double sideband (DSB) signal after direct detection and 14 km transmission is shown in black. Chromatic dispersion leads to power fading. The plot in red shows the single side band (SSB) spectrum of an ideal 100 Gb/s non-return to zero (NRZ).

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Fig. 3.
Fig. 3. Experimental setup. The single side band intensity modulator comprises a dual-electrode plasmonic-organic hybrid (POH) Mach-Zehnder modulator (MZM), tunable laser source (TLS), single digital-to-analog converter (DAC) with differential output (p,n), a mechanical phase shifter (PS), and RF amplifiers (RF-Amp). An erbium doped fiber amplifier (EDFA) amplifies the optical signal. The transmission line exists of standard single mode fiber (SMF) of up to 14 km. The direct detection receiver comprises a variable optical attenuator (VOA), a photodiode (PD), and a real-time oscilloscope (RTO). The offline digital signal processing (DSP) utilizes normalization, timing recovery, T/2-spaced feed forward equalization (FFE), symbol decision, and bit error ratio (BER).

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Fig. 4.
Fig. 4. (a) Optical spectrum of a 100 Gbit/s NRZ-OOK signal for double sideband modulation (DSB) and single sideband modulation (SSB) at an optical carrier wavelength of 1537.5 nm. The two clock tones are spaced apart by 200 GHz. (b) Experimental results for 100 Gbit/s NRZ-OOK. Bit-to-error ratio (BER) as a function of transmission distance for double sideband (DSB) modulation (red, circle) and single sideband (SSB) modulation (black, square). As a reference the HD-FEC limit at 3.8×10-3 (dashed grey) is shown.

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Fig. 5.
Fig. 5. (a) BER as a function of feed forward equalizer filter taps required for double sideband modulation (DSB) and different transmission distances. As a reference the HD-FEC limit at 3.8×10-3 (dashed grey) is shown. (b) BER as a function of feed forward equalizer filter taps required for single sideband modulation (SSB) and different transmission distances. As a reference the HD-FEC limit at 3.8×10-3 (dashed grey) is shown.

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Equations (1)

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P CD ( f ) ∝ cos 2 ( π L D C λ C c 0 f 2 ) ,
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