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Radio over fiber (RoF) system with the coherent detection offers high linearity for the transparent transport of high-frequency microwave signals, and better receiver sensitivity compared with intensity-modulated direct detection systems. The purpose of this paper is to analyze the performance of digital modulation for coherent detection of orthogonal frequency division multiplexing (OFDM) scheme on RoF system at 10 Gbps up to 100 km fiber length. The results show that coherent detection of OFDM-RoF system with 16 quadrature amplitude modulation (16-QAM) has the value of  bit error rate (BER) and the symbol error rate (SER) is very low and its constellation is better compared with other modulation formats (4-QAM, quadrature phase shift keying (QPSK), 8-PSK and 16-PSK), which BER 16-QAM is 0.053 and SER is 15.7%. The results also show that BER value of 4-QAM and QPSK relatively similar to fiber length variations. In general, an increasing value of the BER and SER for each modulation format are almost equal to the fiber length of 60-70 km (Region I and II). However, there is a significant increase in the value of BER in fiber length of 80-100 km (Region III. A and III. B) for the modulation of 4-QAM, QPSK, 8-PSK, and 16-PSK.

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Abstrak -Dalam tulisan ini, kami merancang jaringan akses fiber to the home berbasis gigabit passive optical network (FTTH-GPON) pada area Jakarta Garden City. Pemodelan rancangan menggunakan Google Earth dan OptiSystem. Rancangan yang kami usulkan menggunakan kecepatan downstream 2,4 Gbps dan upstream 1,2 Gbps. Kami mengamati kesesuaian unjuk kerja rancangan terhadap standar FTTH-GPON yang dikeluarkan oleh ITU-T. Kami menggunakan metode perhitungan link power budget dan rise time budget dalam perancangan jaringan FTTH. Berdasarkan hasil pengamatan didapatkan link budget sebesar 22 dB dengan margin daya sebesar 3 dB, rise time budget downstream sebesar 0,27 ns, dan rise stream upstream sebesar 0,25 ns. Pengukuran unjuk kerja rancangan menggunakan metode eye-diagram yang menampilkan jitter, distorsi, signalto-noise ratio (SNR), nilai Q-factor, dan nilai BER. Pengukuran unjuk kerja dengan menggunakan power masukan 5dBm dan panjang gelombang 1490 nm menghasilkan jitter sebesar 16,7 ps, distorsi sebesar 1,07µa.u., SNR sebesar 6,87, Q-factor sebesar 21,249, dan BER sebesar 1,9×10 -99 . Berdasarkan hasil pengamatan dan analisis terhadap hasil tersebut, rancangan jaringan FTTH pada area Jakarta Garden City yang kami usulkan telah memenuhi standar ITU-T untuk penggunaan layanan internet kecepatan tinggi. Kata kunci -FTTH, GPON, link budget, rise time budget, distorsi, jitter, signal-to-noise ratio, BER, Q-factorAbstract -In this paper, we introduced a fiber to the home network access based on gigabit passive optical network (FTTH-GPON) in Jakarta Garden City Area. We proposed a design using Google Earth and OptiSystem. The proposed system used 2.4 Gbps bitrate for downstream and 1.2 Gbps bitrate for upstream. We looked for suitability of the proposed design with ITU-T FTTH-GPON standard. We used the link power budget and the rise time budget method to design the access network. Based on calculation, we got the value of link power budget equal to 22dB, the power margin equal to 3 dB, and the rise time budget equal to 0.27 ns for downstream and 0.25 ns for upstream. To analyze the system performance, we used eye-diagram method to get jitter, distortion, signal-to-noise ratio (SNR), Q-factor, and BER. Based on the experimental result with power 5 dBm and wavelength 1490 nm, we got the jitter 16.7 ps, the distortion 1.07µ a.u., the SNR 6.87, the Q-factor 21.249, and the BER 1.9×10 -99 . The result reveal that in all cases, the Jakarta Garden City FTTH-GPON design met with ITU-T standard.