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8QAM8-State Quadrature Amplitude Modulation
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The demonstration used Acacia's CFP2-DCO modules with 50GHz channel spacing and 200G 8QAM modulation, which additionally showcase the ability to support transmission of up to 19.2T on a single fibre using Tencent's 96 channel OPC-4 and Acacia's CFP2-DCO modules.
Elastic optical network is deployed with a typical channel spacing of 12.5 GHz ([G.sub.EON] = 12.5 GHz) and five modulation format assignment scenarios including four single modulation format (BPSK, QPSK, 8QAM and 16QAM) and a distance-adaptive schemes.
This allows the margin to be shared, which effectively 'pulls up' the red wavelength using the excess FEC margin from the blue wavelength, so both are now above the 8QAM commissioning limit.
The value domain of each attribute in the decision table is expressed as follows: 1) Modulation mode ([C.sub.1]) : BPSK, QPSK, 8QAM, 32QAM .
Compare with the AM scheme, the SNR gain between 75%-DP and 8QAM is 4.6 db, the gain between 50%-DP and QPSK is 1.17 db, the BER performance of 25%-DP is as same as that of BPSK, at [10.sup.-3] BER.