Scalable and Gray-Coded Optical M-ary QAM Using QPSK Modulators with Binary Electronic Driving Signals

Albakay, Naji Ali; Nguyen, Lim

doi:10.1364/fio.2016.jw4a.2

Cited by 2 publications

(2 citation statements)

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“…This Letter extends the 16-QAM design in [8], by presenting a 64-QAM transmitter configuration that employs three QPSK (4-QAM) modulators in tandem driven by binary electrical signals. The flexible transmitter design provides a Gray-coded symbol constellation and is scalable to higher-order QAM.…”

mentioning

confidence: 89%

“…The first QPSK modulator is driven by D1 and D2 while the second QPSK modulator is driven by D3 and D4. As described in [8], the optical carrier (

λ

) is split into two components; one is modulated by the first QPSK (4‐QAM) modulator resulting in the 4‐QAM signal constellation as shown in Fig. 2 a and the other component is shifted by π /4 and combined interferometrically with the 4‐QAM signal at point A generating the offset 4‐QAM in the first quadrant (point B) as illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Optical 64‐QAM transmitter using binary driven QPSK modulators

Albakay

Nguyen

2017

Electron. lett.

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Optical 64-QAM transmitter using QPSK modulators in tandem driven by binary electrical signals is proposed. The proposed transmitter eliminates the need for complex electronics required for the generation of multiple-level signals and provides a Gray-coded constellation with high quality eye diagrams. The design could be scaled to higherorder QAM based on the user needs. Conclusion: We have presented a scalable, optical square 64-QAM transmitter using tandem QPSK modulators driven by binary electrical signals. The transmitter designs for 64-QAM have been simulated at 50 Gbaud using OptiSystem. The results demonstrated Gray-coded symbol constellations and high quality eye diagrams.

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mentioning

confidence: 89%

“…The first QPSK modulator is driven by D1 and D2 while the second QPSK modulator is driven by D3 and D4. As described in [8], the optical carrier (