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Transmission of 108-Gb/s PDM 16ADPSK signal on 25-GHz grid using non-coherent receivers

Y. Takushima, H. Y. Choi, and Y. C. Chung

Open Access Open Access

Abstract

We demonstrate the transmission of 108-Gb/s polarization-division-multiplexed (PDM) 16-ary amplitude- and differential phase-shift-keying (16ADPSK) signal by using a non-coherent receiver. We generate the 16ADPSK signal by using a differential 8-ary phase-shift-keying (D8PSK) modulator and a phase-distortion-free amplitude-shift-keying (ASK) modulator. On the other hand, the receiver is implemented by using a delay interferometer based on a 3×3 fiber coupler and the data-aided phase-noise estimation (DAPNE) algorithm. By using these transmitter and receiver, we achieve a nearly quantum-limited receiver sensitivity in the back-to-back condition. In addition, we examine the possibility of transmitting 108-Gb/s signals on a 25-GHz grid without using the coherent detection technology. The results show that we can secure a sufficient optical-signal-to-noise (OSNR) margin after the transmission of 80-km long dispersion managed link. The achieved spectral efficiency is 4.0 bit/s/Hz.

©2009 Optical Society of America

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Figures (11)
Fig. 1.
Fig. 1. Schematic diagram of the PDM 16ADPSK transmitter

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Fig. 2.
Fig. 2. (a) Trajectories of the complex electric field, E, of a conventional chirp-free MZ modulator with a finite ER of 16 dB. Open circles indicate the operating points of mark and space when the on-off ratio was set to 3.9 dB. (b) Phase errors (i.e., angle between the mark and the space on the phasor diagram caused by the finite ER of the MZ modulator).

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Fig. 3.
Fig. 3. Phase-distortion-free ASK modulation by using a QPSK modulator.

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Fig. 4.
Fig. 4. (a) Differential phasor of 40.5-Gb/s D8PSK tributary. (b) 54-Gb/s 16ADPSK signal. (left) measured differential phasor. (right) intensity eye diagram

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Fig. 5.
Fig. 5. Configuration of 54-Gb/s (108-Gb/s with PDM) 16ADPSK receiver

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Fig. 6.
Fig. 6. Back-to-back sensitivities of 54-Gb/s and 108-Gb/s PDM 16ADPSK receivers. The dotted lines show the quantum-limited sensitivity.

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Fig. 7.
Fig. 7. Experimental setup of 108-Gb/s PDM 16APDK transmission on a 25-GHz WDM gird

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Fig. 8.
Fig. 8. BER vs. OSNR measured for 108-Gb/s PDM 16ADPSK signals.

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Fig. 9.
Fig. 9. Measured optical spectra of 108-Gb/s PDM 16ADPSK signals (resolution: 1.2 GHz). (a) Single channel without filtering, (b) single channel filtered by IL, and (c) 3 WDM channels.

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Fig. 10.
Fig. 10. Optical spectra of the received signal measured after passing through the 0.25-nm OBPF. (a) 3-channel WDM transmission. (b) Single channel transmission.

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Fig. 11.
Fig. 11. Differential constellations of 108-Gb/s PDM 16ADPSK signal measured after the transmission of 80-km long SSMF.

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