A. Sangeetha ¹, B. Bharath Reddy ², G. Murali Krishna ²

Affiliations
1 Photonics and Microwave Division, VIT University, IN
2 Department of Communication Engineering, VIT University, IN

Abstract

In this paper, a combination of different wavelength injection techniques is demonstrated in a bidirectional WDM PON's implementation using arrayed waveguide grating. Wavelength reusable ONU's are provided with fiber bragg grating at particular wavelength, so that it reflects particular wavelength and transmits the remaining power, which is re-modulated as upstream by LiNbO3 modulator. Self seeding based ONU's are provided with reflective semiconductor optical amplifier, so that it not only function as amplifier, but also as a modulator for upstream generation(no need of local sources). Externally wavelength injected ONU's are provided with local source for upstream generation. The integration of all three wavelength injection techniques makes a true next generation PON technologies. The performance of implemented system has been analyzed on the basis of Min-log of BER versus OSNR, Min-log of BER versus received power. The performance of wavelength reusable based ONU's are close to externally injected ONU's performance in both downstream and upstream, so that it can be used in place of externally wavelength injected with link-length trade-off. Self-seeding based ONU's performance is close to externally wavelength injected ONU's performance below 50Km link-length in both downstream and upstream, so that it can be used in place of externally wavelength injected with upstream data rate trade-off.

Keywords

Arrayed Waveguide-grating (AWG), Fiber Bragg Grating (FBG), Passive Optical Network (PON), Reflective Semiconductor Optical Amplifier (RSOA), Wavelength Division Multiplexing (WDM)

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A. Sangeetha ¹, B. Ram Kumar ¹, Srinivasa Rao ¹

Affiliations
1 School of Electronics and Communication Engineering, VIT University, Vellore 632014, Tamil Nadu, IN

Abstract

In this paper, we investigate OFDM-WDM-PON as an effective method for achieving high data rates in which OFDM is used as key element to combat dispersion. Large guard band intervals between adjacent OFDM symbols accommodate the distortion introduced by chromatic dispersion leading to reduced ISI. The system design involves the realization of FTTH by integrating OFDM, WDM and PON. OFDM also aids in improving receiver sensitivity. An aggregate of 40 Gbps, Direct detection OFDM-WDM-PON is designed and analyzed. Dispersion compensation techniques are used to achieve a bit error rate in the order of 10-8 and a split ratio of 1100 is achieved.

Keywords

OFDM, PON, WDM.

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