This paper presents experimental data demonstrating a novel differential quadrature phase-shift keying receiver based on optical frequency discriminator demodulator with direct detection. The experimental results confirm theory, showing a factor of 2$\times$ enhanced tolerance to chromatic dispersion compared with a conventional delay-interferometer-based demodulator with balanced detection. The frequency discriminator direct detection receiver also shows a significant improvement in tolerance to Gordon–Mollenauer nonlinear phase noise.
© 2009 IEEE
Cheng-Chung Chien, Yi-Hsiang Wang, Ilya Lyubomirsky, and Yannick K. Lizé, "Experimental Demonstration of Optical DQPSK Receiver Based on Frequency Discriminator Demodulator," J. Lightwave Technol. 27, 4228-4232 (2009)