Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-25-26-33534
Timestamp: 2019-04-21 01:07:43+00:00

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We propose 4D modulation with direct detection employing a novel Stokes vector Kramers Kronig transceiver. It shows that employing a Stokes vector receiver, transmitting a digital carrier and using Kramers Kronig detection offer an effective way to de-rotate polarization multiplexed complex double side band signal without using a local oscillator at receiver. The impact of system parameters and configurations including carrier-to-signal-power ratio, guard band of the digital carrier, digital oversampling ratio and real MIMO is experimentally investigated. Finally, a record net data rate of 400 Gb/s (a raw rate of 480 Gb/s including FEC overhead) over 80 km SSMF is achieved in a 60 Gbaud PDM-16QAM single carrier experiment with a BER below the threshold of 2.0x10−2.
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Fig. 1 Evolution of direct detection over the last four years.
Fig. 2 Schematic diagram of the proposed SVKK system including (a) the transmitter with DSP blocks to generate signals, and (b) the receiver with DSP blocks after the SVR to recover PDM signals, and constellations of 60 Gbaud 16QAM signals after 80km.
Fig. 3 Experimental setup. Inset is the optical spectrum of 60 Gbaud 16QAM after 0.4 nm optical filter.
Fig. 4 (a) Impact of CSPR and Guard band with PDM-16QAM 27 Gbaud in B2B, (b) BER versus OSNR for 27Gbaud in B2B.
Fig. 5 Demonstration of Stokes polarization de-multiplexing: (a) the amplitude of transmitted |Ex|2 and received |Ex|2 during training period at 2 different SOP; (b) SNR versus SOP for 27 Gbaud DP-16QAM signals in B2B and 80 km cases.
Fig. 6 Parametric study of SVKK. (a) BER versus baud rate employing 8QAM, 16QAM, 32QAM and 64QAM in B2B, (b) SNR versus roll-off-factor for 27 Gbaud 16QAM in B2B, (c) BER versus digital oversampling ratio with three CD compensation schemes, and (d) SNR versus distance for 27 Gbaud 16QAM. Inset: 16QAM constellations after 80 km using real and complex MIMO.
Fig. 7 (a) BER versus baud rate of DP-16QAM signals. Inset: constellation of 60 Gbaud signal after 80km. (b) SNR versus digital oversampling ratio (samples/symbol) at various baud rate.

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