عنوان النشاط
OFDM with Coherent detection in optical fiber communication system
الجهة المنظمة
الكلية الاسلامية الجامعة / الهندسة / قسم هندسة تقنيات الحاسوب
تأريخ الانعقاد
2017-04-09
مكان الانعقاد
الجامعة الاسلامية / النجف الاشرف
نبذة مختصرة
Optical fiber:
An optical fiber communication system is similar in basic concept to any type of communication System. The communication system consists of a transmitter or modulator linked to the information source, the transmission medium, and a receiver or demodulator at the destination point.
Coherent detection:
Improvements in receiver sensitivity, together with wavelength selectivity, may be obtained using the well-known coherent detection techniques (i.e. heterodyne and homodyne detection) for the optical signal. Unlike direct detection in which the optical signal is converted directly into a demodulated electrical output, such coherent optical receivers first add to the incoming optical signal from a locally generated optical wave prior to detecting the sum.
OFDM:
Orthogonal frequency division multiplexing (OFDM) is a multicarrier transmission technique which is based on frequency division multiplexing (FDM) In conventional FDM multiple-frequency signals are transmitted simultaneously in parallel where the data contained in each signal is modulated onto subcarriers and therefore the subcarrier multiplexed signal typically contains a wide range of frequencies.