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We have proposed an 8PSK modulator based on three microring modulators (MRM). The design consists of three MRMs, each with a radius of 11.1 μm. Of these three, two MRMs are connected in parallel and they together generate a quadrature phase shift keying (QPSK) signal. While at the output port of the QPSK, a third MRM is connected in series works as an angle modulator, which is basically a 45° phase shift modulator; that is, the output of the MRM varies by 45° depending on the bit pattern fed to it, '0'or '1' respectively. We have simulated and shown the performance of the proposed 8PSK modulator after transmitting the modulated signal through various lengths of optical. Constellation diagrams and eye diagrams at different fiber lengths are analyzed. Bit error rate (BER) versus optical signal to noise ratio curve shows that, 10−3 BER has been achieved at 13.5 dB optical signal to noise ratio. [ABSTRACT FROM AUTHOR]

In this work, an optical 8-amplitude phase shift keying (8APSK) modulator has been designed and successfully simulated using three silicon microring modulators (MRMs). The first two MRMs jointly generate a QPSK signal, while the third MRM is connected in an add-drop configuration to synthesize the final 8APSK signal. The MRMs have a junction volume of 4.5×10−12 cm−3 with carrier recombination lifetime of 100×10−12 seconds. We have obtained the simulated constellation plots at various signal-to-noise ratios and achieved a bit error rate of 10−3 at around 10.7 dB optical signal to noise ratio. [ABSTRACT FROM AUTHOR]

Abstract: We have introduced and comprehensively analyzed a novel scheme of simultaneous demodulation and dispersion compensation of wavelength division multiplexed (WDM) non-return-to zero (NRZ) differential phase shift keying (DPSK) optical link using an optical ring resonator (ORR) based filter. Using extensive numerical simulation we have demonstrated the transmission of 10.7Gb/s WDM DPSK channels having 50GHz and 100GHz spacing over 400km of unrepeatered reach at 20dB optical-signal-to-noise-ratio (OSNR) to achieve a bit error rate (BER) of 10−3. [Copyright &y& Elsevier]