Splitter is a passive device that splits optical signal in the downstream direction in 1 x N manner. PON splitter delivers the same signal from OLT to all ONUs/ONTs. Signal is being delivered with the same power over the N output fibers. PON is usually using devices that combine splitter/coupler in one and use them for downstream/upstream distribution.
Figure 1. Alternative 1:16 splitter implementations
The amount of ports in splitter (N) is determining its signal loss. Optical splitter/coupler is having the same loss in both directions. Any split ratio can be achieved in many different ways as shown in Figure 1. Increasing amount of splitters creates power loss, making 1:64 maximum split ratio. Different ITU-T Recommendations specify different split ratios:
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802.3ah – 16
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G.983 – 32
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G.984 – 64
Typical splitter specifications are shown in Table 1.
Table 1.
| Dual Window Wideband | Wavelength Range (nm) | Typical IL (dB) | Max IL (dB) | Uniformity (dB) | Return Loss (dB) | Directivity (dB) | PDL (dB) |
| 1×2 Splitter | 1260-1360 and 1480-1580 nm | 3.20 | 3.60 | 0.70 | ≥55 | ≥50 | 0.20 |
| 2×4 Splitter | 1260-1360 and 1480-1580 nm | 6.30 | 7.80 | ≥1.6 | ≥55 | ≥50 | 0.30 |
| 2×8 Splitter | 1260-1360 and 1480-1580 nm | 10.20 | 11.00 | 2.00 | ≥55 | ≥55 | 0.20 |
| 1×4 Splitter | 1260-1360 and 1480-1625 nm | 6.60 | 7.00 | 0.80 | ≥55 | ≥55 | 0.20 |
| 1×8 Splitter | 1260-1360 and 1480-1625 nm | 9.80 | 10.40 | ≥1.0 | ≥55 | ≥55 | 0.20 |
| 1×16 Splitter | 1260-1360 and 1480-1625 nm | 10.20 | 11.00 | 2.00 | ≥55 | ≥55 | 0.20 |
| 1×32 Splitter | 1260-1360 and 1480-1625 nm | 15.70 | 17.10 | ≥1.5 | ≥55 | ≥55 | 0.30 |
| 2×16 Splitter | 1260-1360 and 1480-1625 nm | 13.30 | 14.50 | 2.30 | ≥55 | ≥55 | 0.40 |
| 2×32 Splitter | 1260-1360 and 1480-1625 nm | 17.00 | 17.50 | 2.50 | ≥55 | ≥55 | 0.40 |
Legend for the Table 1 is:
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Wavelength range – first value supported wavelengths by splitter, second value – supported wavelengths by coupler
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Insertion Loss (IL) – amount of signal loss after going through device
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Typical IL – measured at room temperature at specified center wavelength
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Max IL – measured with range of temperatures and wavelengths
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Uniformity – maximum difference between highest/lowest IL and the leg of splitter
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Return Loss (RL) amount of reflected signal
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Directivity – ratio of the power radiated in the output direction to the average of the power radiated in all directions.
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Polarization-Dependent Loss (PDL) – variation of the splitter insertion loss with varying states of the signal polarization
AD-net offers full range of splitters for your FTTx network and ensures they work smooth woth your OLT’s and ONU’s. You can check more real product on this link: https://www.ad-net.com.tw/index.php?id=815
Testimonials
Lomoveishiy – Finland
I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!
