Photonics Research, 2016, 4 (5): 05000168, Published Online: Nov. 23, 2016
Experimental performance evaluation of quadrature amplitude modulation signal transmission in a silicon microring 
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Fig. 1. Experimental setup for data transmission of OFDM/OQAM m-QAM signals through a silicon microring resonator. (a)-(d) SEM images of (a) waveguide cross section, (b) mirroring resonator, (c) coupling region between the bus waveguide and bending waveguide, and (d) grating coupler.
Fig. 2. (a) Measured transmission spectrum of fabricated microring resonator. (b) Zoomed-in spectrum of selected resonance in the experiment. (c) RF spectrum of demodulated signal.
Fig. 3. BER versus received OSNR for data transmission of OFDM/OQAM m-QAM signal through a silicon microring resonator. (a) 64-QAM. (b) 128-QAM. (c) 256-QAM. (d) 512-QAM. Inserts are constellations of signal after transmission. B-to-B, back-to-back; Aft. Trans., after transmission.
Fig. 4. BER versus signal wavelength detuning from the microring resonance wavelength for experimental measurements (circles) and fitting curve (solid line). Insets are constellations of 256-QAM signals.
Fig. 5. (a) Input spectrum of eight wavelength channels before the input of the modulator. (b) BER versus received OSNR for all eight-channel OFDM/OQAM 256-QAM data transmission. (c)–(e) Constellations of (c) B-to-B signal at 1554.54 nm, transmitted signals at (d) 1544.54 and (e) 1546.41 nm. B-to-B, back-to-back; W1, 1544.54 nm; W2, 1546.41 nm; W3, 1548.28 nm; W4, 1550.15 nm; W5, 1552.02 nm; W6, 1553.89 nm; W7, 1555.76 nm; W8, 1557.63 nm.
Chengcheng Gui, Jian Wang. Experimental performance evaluation of quadrature amplitude modulation signal transmission in a silicon microring[J]. Photonics Research, 2016, 4(5): 05000168.
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