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320 Gb/s Nyquist OTDM received by polarization-insensitive time-domain OFT

H. Hu, D. Kong, E. Palushani, M. Galili, H. C. H. Mulvad, and L. K. Oxenløwe

Open Access Open Access

Abstract

We have demonstrated the generation of a 320 Gb/s Nyquist-OTDM signal by rectangular filtering on an RZ-OTDM signal with the filter bandwidth (320 GHz) equal to the baud rate (320 Gbaud) and the reception of such a Nyquist-OTDM signal using polarization-insensitive time-domain optical Fourier transformation (TD-OFT) followed by passive filtering. After the time-to-frequency mapping in the TD-OFT, the Nyquist-OTDM signal with its characteristic sinc-shaped time-domain trace is converted into an orthogonal frequency division multiplexing (OFDM) signal with sinc-shaped spectra for each subcarrier. The subcarrier frequency spacing of the converted OFDM signal is designed to be larger than the transform-limited case, here 10 times greater than the symbol rate of each subcarrier. Therefore, only passive filtering is needed to extract the subcarriers of the converted OFDM signal. In addition, a polarization diversity scheme is used in the four-wave mixing (FWM) based TD-OFT, and less than 0.5 dB polarization sensitivity is demonstrated in the OTDM receiver.

© 2013 Optical Society of America

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Figures (6)
Fig. 1
Fig. 1 Nyquist OTDM transmitter and receiver. (a) Spectra before (black) and after (red) the Nyquist filter; OSO eyediagrams before (b) and after (c) the Nyquist filter, at the center of each bit period (white circle) ICI between TDM tributaries is avoided; Experimental setup of the Nyquist OTDM transmitter (d) and polarization-insensitive Nyquist OTDM receiver (e); (f) Optical spectrum and OSO eyediagram (inset) of 10 GHz linearly chirped pump pulses; Optical spectra of the FWM output for the input signals of 320 Gb/s N-OTDM DPSK (g) and 320 Gb/s RZ-OTDM DPSK (h).

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Fig. 2
Fig. 2 Concept of interchange between time and frequency using TD-OFT (a Nyquist-OTDM can be converted into a waveform similar to an OFDM signal and the frequency spacing can be adjusted by changing the factor of M).

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Fig. 3
Fig. 3 Simulated results for a single N-OTDM tributary at the input of the TD-OFT. (a) Optical spectra at the output of the TD-OFT for a single OTDM tributary at different time slot, which corresponds to different OFDM subcarrier after the TD-OFT; (b) time-domain waveform of a single subcarrier as the idler before (red) and after (blue) another dispersion with a chirp rate of K.

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Fig. 4
Fig. 4 (a) BER measurements for the 320 Gb/s RZ-OTDM DPSK signal and 320 Gb/s N-OTDM DPSK signal using different bandwidth (BW) filter to extract the generated idlers after the TD-OFT; (b) transfer functions of the filters with different BW (10 GHz, 20 GHz, 30 GHz, 40 GHz, 50 GHz and 60 GHz).

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Fig. 5
Fig. 5 (a) BER measurements for the 10 Gb/s subcarriers extracted at different wavelengths; (b) OSNR sensitivity of all the 32 OTDM tributaries at a BER of 1E-9, measured by scanning the N-OTDM signal in the time domain and keeping the 40 GHz filter fixed at 1533.4 nm.

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Fig. 6
Fig. 6 (a) Power fluctuation of the generated idler with polarization scrambling; (b) BER measurements when using the NOLM to demultiplex OTDM tributaries with the control pulsewidth of 1 ps, 2 ps and 3 ps.

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