Effects of Electrical and Optical Equalizations in 28-Gb/s RSOA-Based WDM PON

We experimentally investigate the roles of electrical and optical equalizers in the 28-Gb/s wavelength-divisionmultiplexed passive optical network implemented by using reflective semiconductor optical amplifiers (RSOAs) and directdetection receivers. For the generation of 28-Gb/s signal, we directly...

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Bibliographic Details
Published in:IEEE photonics technology letters 2016-11, Vol.28 (22), p.2537-2540
Main Authors: Hyun Kyu Shim, Hoon Kim, Chung, Yun C.
Format: Article
Language:English
Subjects:
Equalizers
Optical attenuators
Optical distortion
Optical fibers
Optical modulation
Optical receivers
Optical sensors
passive optical network
Reflective semiconductor optical amplifiers
wavelength-division-multiplexing
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Summary:We experimentally investigate the roles of electrical and optical equalizers in the 28-Gb/s wavelength-divisionmultiplexed passive optical network implemented by using reflective semiconductor optical amplifiers (RSOAs) and directdetection receivers. For the generation of 28-Gb/s signal, we directly modulate an RSOA in the polar return-to-zero (RZ) N-ary pulse-amplitude-modulation (PAM) format. The results show that the optical equalization is capable of compensating the waveform distortions caused by both the bandwidth-limitation of RSOA and fiber's chromatic dispersion without deteriorating the signal-to-noise ratio (SNR). On the other hand, the electrical equalization is effective for the compensation of the bandwidthlimitation of RSOA only at the cost of SNR. The results also show that the electrical equalization is helpful to compensate for the remaining waveform distortions after the optical equalization. By using both equalizers, we demonstrate the transmission of the 28-Gb/s signals in polar RZ-PAM-N formats (N = 2, 3, and 4) over 20 km of standard single-mode fiber.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2016.2602883