Abstract
We report on the transmission experiment of seven 12.5-GHz spaced all optical-orthogonal frequency division multiplexed (AO-OFDM) subcarriers over a 35-km fiber link, using differential quadrature phase shift keying (DQPSK) modulation and direct detection. The system does not require chromatic dispersion compensation, optical time gating at the receiver (RX) or cyclic prefix (CP), achieving the maximum spectral efficiency. We use a wavelength selective switch (WSS) at the transmitter (TX) to allow subcarrier assignment flexibility and optimal filter shaping; an arrayed waveguide grating (AWG) AO-OFDM demultiplexer is used at the RX, to reduce the system cost and complexity.
Highlights
With the increasing demand for high data-rate telecom services, optical networks are requested to provide enhanced bandwidth management flexibility, as well as high spectral efficiency [1,2,3]
We report on the transmission experiment of seven 12.5-GHz spaced all optical-orthogonal frequency division multiplexed (AO-OFDM) subcarriers over a 35-km fiber link, using differential quadrature phase shift keying (DQPSK) modulation and direct detection
Many different approaches have been presented in literature to optically shape the input light source with a frequency sinc-like profile, and generate the AO-OFDM subcarriers; the optical implementations of the IFFT/FFT schemes are based on trees of Mach Zehnder delay interferometers (MZDI) [7,8], arrayed waveguide gratings (AWG) [10,11,12,13,14,15,16,17], fiber Bragg gratings (FBG) [18], and wavelength selective switches (WSS) [19, 20]
Summary
With the increasing demand for high data-rate telecom services, optical networks are requested to provide enhanced bandwidth management flexibility, as well as high spectral efficiency [1,2,3]. Many different approaches have been presented in literature to optically shape the input light source with a frequency sinc-like profile, and generate the AO-OFDM subcarriers; the optical implementations of the IFFT/FFT schemes are based on trees of Mach Zehnder delay interferometers (MZDI) [7,8], arrayed waveguide gratings (AWG) [10,11,12,13,14,15,16,17], fiber Bragg gratings (FBG) [18], and wavelength selective switches (WSS) [19, 20]. The results in back-to-back (B2B) are shown together with the performance achieved with quadrature phase shift keying (QPSK) modulation and coherent detection, to demonstrate the effectiveness of the proposed AOOFDM transmitter. Error-free propagation for different fiber link lengths is demonstrated
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