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Register a new userStudy and analysis of the impact of noise on the receiver sensitivity in the digital optical communication system
دراسة و تحليل تأثير الضجيج على حساسية المستقبل في نظام الاتصال الضوئي الرقمي
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كابي جورج( باحث )
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يتضمن البحث دراسة و تحليل تأثير كلاَ من الضجيج الحراري، و الضجيج الطلقي على حساسية المستقبل في نظام اتصال ضوئي رقمي، و يسلط الضوء على البارامترات التي تؤثر سلباً و إيجاباً على الحساسية، و قد تم استخدام اللغة البرمجية ماتلاب MATLAB لدراسة العلاقة بين حساسية المستقبل و معدل المعطيات، و أوضحت مدى أفضلية حساسية المستقبل المحدود بالضجيج الطلقي من المستقبل المحدود بالضجيج الحراري؛ حيث تكون الحساسية أفضل بحدود 30dB. كما قدمت الدراسة توضيحاً لأفضلية الكاشف الضوئي APD من ناحية الحساسية مقارنة مع الكاشف الضوئي PIN بسبب ربحه الداخلي، و ذلك عندما يكون الضجيج الحراري هو المهيمن، و لكن يفضل الـ PIN عندما يكون الضجيج الطلقي هو المهيمن. و تبين لنا من الدراسة تحسن حساسية مستقبل محدود بالضجيج الطلقي من أجل كفاءة كم أعلى و من أجل طول موجة أكبر، و لكنها تسوء للحصول على معدل خطأ أصغر. كما أظهرت تحسن حساسية مستقبل محدود بالضجيج الحراري بزيادة الاستجابية و بزيادة مقاومة الحمل، و لكنها تسوء بزيادة رقم الضجيج و كذلك من أجل معدل خطأ أصغر.
The effect of thermal noise and shot noise on the receiver sensitivity in a digital optical communication system will be studied and analyzed. Also, the positive and negative effects of Parameters on the receiver sensitivity will be highlighted. The programming tools (MATLAB) is used to study the relationship between the receiver sensitivity and bit rate. It showed that the shot-noise-limited receiver sensitivity is much better than the thermal -noise-limited receiver sensitivity with best 30dB. The study also provided an explanation for the preference of optical detector (APD) compared to that in (PIN) optical detector from sensitivity side due to its internal gain, this can be achieved when the thermal noise is dominant. However, the preference of optical detector(PIN) will be better in case of shot noise is dominant. Analyzed results show that there is a significant improvement in the shot-noiselimited receiver sensitivity for high quantum efficiency and high wavelength. However, the sensitivity is deteriorated to get a lower error rate. The thermal -noise-limited receiver sensitivity showed an improving by increasing the responsivity and the load resistance. However, it decreases by increasing the number of noise and the error rate.
References used
OTHMAN, A؛ TAIB, N ؛ HUSAIN, N ؛ NAPIAH ,A. Reviews on valanche photodiode for opticalcommunication technology. ARPN Journal, Malaysia , vol. 9, no. 1, 2014, 35-44
GOVIND,P.A.Fiber-Optic Communication Systems. 3th ed,John Wiley & Sons, Inc, New York,2002,561
KBASHI, H. J؛ Al-DABAG,S.Y؛HAMEED, H.A. Comparison between Direct and Coherent Optical Communication System. Baghdad Science Journal, Vol.8(2)2011,479-483
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