NEXUS-TKJ / FTTH MODULE 837
Fiber Optic & FTTH Engineering Lab
Simulasi fiber optik berbasis ITU-T G.652/G.984 — Fusion Splicing, OTDR Profesional, GPON OLT/ONT, Power Budget, dan Link Certification
FTTH Link Overview
REAL-TIME0 km
Total Link
0 dB
Total Loss
0 dB
Margin
OFF
Status
Quick Config
SOP Praktikum FTTH
8 LANGKAH1
Survey & Planning
2
Cable Preparation
3
Fiber Cleaning
4
Cleaving
5
Fusion Splicing
6
Protection Sleeve
7
OTDR Testing
8
Link Certification
FTTH Network Topology
Drag untuk memindahkan perangkat. Klik kanan untuk konfigurasi.
OLT
ODC
Splitter
ODP
ONT/ONU
Device Configuration
OLT - GPON Port 1
Tx: +5 dBm
ODC - Distribution Cabinet
1:8 Splitter
Splitter - 2nd Stage
1:4 Splitter
ODP - Optical Distribution Point
4 Port
ONT-1 / Pelanggan A
Rx: -19.2 dBm
Link Power Analysis
Tx Power (OLT)
+5.0 dBm
Rx Power (ONT)
-19.2 dBm
Total Link Loss
24.2 dB
Power Margin
3.8 dB
CLI: POWER-BUDGET ANALYSIS
ITU-T G.984
$ power-budget --analyze --link ftth
[TX_POWER] +5.0 dBm (OLT GPON Class B+)
[RX_SENS] -28.0 dBm (ONT Receiver)
[FIBER_ATTEN] 0.35 dB/km × 5.0 km = 1.75 dB
[SPLITTER] 1:8 = 10.5 dB | [CONN] 0.25 dB × 4 = 1.0 dB
[SPLICE] 0.05 dB × 4 = 0.2 dB
[TOTAL_LOSS] 13.45 dB | [MARGIN] 14.55 dB ✓ PASS
OTDR Trace
STANDBY
0.0 s
5.0 km
EDZ: 0 m
ADZ: 0 m
Avg: 1x
Parameter
Event Table
Run test untuk melihat event
OTDR Physics Reference
IEC 61746Dead Zone:
After strong Fresnel reflection, detector is blinded. EDZ = can detect events (but not measure). ADZ = can measure loss accurately.
After strong Fresnel reflection, detector is blinded. EDZ = can detect events (but not measure). ADZ = can measure loss accurately.
Fresnel Reflection:
Occurs at connector/break. Up to 4,000x stronger than Rayleigh backscatter. Causes detector saturation.
Occurs at connector/break. Up to 4,000x stronger than Rayleigh backscatter. Causes detector saturation.
Rayleigh Backscatter:
Natural scattering from glass impurities. Used to measure fiber attenuation (dB/km). Follows exponential decay.
Natural scattering from glass impurities. Used to measure fiber attenuation (dB/km). Follows exponential decay.
Pulse Width:
Short pulse = high resolution, short range. Long pulse = low resolution, long range. Trade-off between detail and reach.
Short pulse = high resolution, short range. Long pulse = low resolution, long range. Trade-off between detail and reach.
OLT Management — NEXUS-TKJ
ITU-T G.984 GPON Optical Line Terminal — --
ACTIVE
+5.0
Tx Power (dBm)
0
ONT Registered
0%
Bandwidth Util
0 km
Max Distance
0
Total OLTs
PON Port Control
Splitter Ratio
Tx Power (dBm)
Rx Sensitivity (dBm)
Optical Class
FEC
SFP Diagnostics--
Temperature-- °C
Voltage-- V
Tx Bias Current-- mA
Tx Power-- dBm
Rx Power-- dBm
ONT Registration
0 ONTsBandwidth
Downstream
0 B
Upstream
0 B
Bandwidth Utilization0%
ONT Database
O5: 0
Other: 0
| Serial | State | Dist | Rx Power | Tx Power | Margin | EqD | T-CONTs | GEM | Alarms | Action |
|---|
Tidak ada ONT terdaftar. Daftarkan ONT menggunakan panel Registration.
DBA Configuration
ITU-T G.984.3DBA ModeSR-DBA
Polling Interval2 frames
Total BW Requested0 bytes
Total BW Allocated0 bytes
OMCI Message Log
Belum ada aktivitas OMCI
Power Budget Calculator
Budget Results
Available Budget
0 dB
Total Link Loss
0 dB
Remaining Margin
0 dB
Verdict
--
Fiber Attenuation0 dB
Splice Loss0 dB
Connector Loss0 dB
Splitter Loss0 dB
System Margin0 dB
Max Distance Estimator
0
1310 nm (km)
0
1550 nm (km)
0
1625 nm (km)
Standar & Referensi Industri
ITU-T G.652
Karakteristik serat optik single-mode: redaman 0.35 dB/km @1310nm, 0.20 dB/km @1550nm. Indeks bias core 1.4677.
ITU-T G.984 (GPON)
Gigabit Passive Optical Network: downstream 2.488 Gbps @1490nm, upstream 1.244 Gbps @1310nm. Max split 1:64, jarak 20km.
IEC 61746
Kalibrasi OTDR: definisi event dead zone (-1.5 dB dari peak), attenuation dead zone (0.5 dB dari backscatter), dan metode pengukuran.
ITU-T G.107 (E-Model)
Perhitungan kualitas transmisi untuk perencanaan jaringan: faktor R, delay, packet loss, dan konversi ke MOS score.
Splitter Loss Reference
1:2=3.8dB | 1:4=7.2dB | 1:8=10.5dB | 1:16=13.8dB | 1:32=17.1dB | 1:64=20.4dB
Optical Bands
O(1260-1360) E(1360-1460) S(1460-1530) C(1530-1565) L(1565-1625) U(1625-1675)
Physics Formulas
Link Loss Budget:
P_total = αL + ΣA_splice + ΣA_connector + A_splitter + Margin
P_total = αL + ΣA_splice + ΣA_connector + A_splitter + Margin
Event Dead Zone:
EDZ = (c × τ) / (2 × n) — where τ = pulse width, n = refractive index
EDZ = (c × τ) / (2 × n) — where τ = pulse width, n = refractive index
Attenuation Dead Zone:
ADZ ≈ 5 × EDZ — depends on reflection strength and detector recovery
ADZ ≈ 5 × EDZ — depends on reflection strength and detector recovery
Rayleigh Backscatter:
P_R(z) = P_0 · S · α_R · W_0 · v_g · exp(-2αz)
P_R(z) = P_0 · S · α_R · W_0 · v_g · exp(-2αz)
Fresnel Reflection:
R = [(n_1 - n_2)/(n_1 + n_2)]^2 — up to -14 dB for glass-air interface
R = [(n_1 - n_2)/(n_1 + n_2)]^2 — up to -14 dB for glass-air interface
Chromatic Dispersion:
Δt = D × L × Δλ — D = 17 ps/nm-km @1550nm
Δt = D × L × Δλ — D = 17 ps/nm-km @1550nm