PERFORMANCE ANALYSIS OF SCM TRANSMISSION LINK FOR DPSK DATA

Rajesh Goyal Haryana State Board of Technical Education (HSBTE), Panchkula-134107, Haryana, India Email- goelrajesh17@gmail.com

Abstract

Aim of this paper is to focus on the impact of different parameters on the performance of the Subcarrier Multiplexed Optical Transmission System for the application on radio link via optical fiber. Performance results were evaluated for DPSK data format for ODSB and OSSB modulation of Microwave subcarriers with digital NRZ coded random data patterns. The four sub-systems of DPSK modulators were kept at 400, 500, 600, 700 MHz subcarrier frequencies with a frequency spacing of 100 MHz. The power of subcarriers lowers with increase of the link distance due to dispersion and attenuation. With the use of dispersion compensation fiber, the link distance successfully enhanced from 120 km to 240 km. The impact of chromatic dispersion reduced in OSSB with the use of dual-electrode MZM. The constellation diagram also confirms that the phase of the signal after traveling through the link was changed due to dispersion. The impact of linewidth and responsivity on SNR was also analyzed. The maximum SNR decreased with increase in the linewidth of laser source and was increased with the increase in responsivity of PIN diode for the same fiber length in SCM transmission.

 

 

 

Keywords:

Constellation Diagram, SCM, ODSB, OSSB, DPSK.

 

 

 


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References



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