We Use A Mid-Level SFP Wide Band 10G SFP Longer Reach

We Use A Mid Level Sfp Iewide Band 10g Sfp Longer Reachsfp 10g Er

We use a mid-level SFP, specifically the Wide Band 10G SFP Longer Reach (SFP-10G-ER), which costs $4,110 at both ends, with a loss tolerance of 20 dB (from 4 to -16). The wavelength of this SFP is 1550 nanometres. The total path length is 67 km, calculated using the formula (1+6+10) km. The fiber loss for this SFP is 0.2 dB per km, resulting in a total fiber loss of 13.4 dB over the entire span.

Additionally, splice losses are factored in; with a splice loss of 0.2 dB every 5 km, and selecting splicing instead of amplification, the total number of splices is 13, leading to a cumulative splice loss of 13 * 0.2 = 2.6 dB. Furthermore, there are 3 connectors, each contributing 0.5 dB loss, summing to 1.5 dB. Combining these losses—fiber, splices, and connectors—the worst-case total loss amounts to 17.5 dB. This total is below the maximum allowable loss of 20 dB, ensuring system viability.

Alternatively, one could choose the Wide Band 10G SFP Long Reach (SFP-10G-LR), but this would require the addition of an optical amplifier to compensate for the span, which would increase system costs. The current solution remains the most cost-effective, with the total system cost at approximately $33,000. Considering the Longest Reach option (SFP-10G-ZR), although it would enhance reliability and add margin for additional splices or span length increases, it comes with substantially higher costs. The goal here is to provide the most economical solution that still meets system requirements.

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The design and implementation of fiber optic communication systems require careful selection of components that balance performance, reliability, and cost. In this context, the choice of an SFP transceiver plays a crucial role in ensuring signal integrity over long distances. The considered solution employs a mid-level Wide Band 10G SFP-ER, balancing cost and performance, suitable for spans up to approximately 67 km.

Fiber optic links are characterized by inherent signal attenuation, which is influenced by the fiber's properties, splice losses, and connector losses. The selected SFP-10G-ER, operating at 1550 nm wavelength, offers a fiber loss rate of 0.2 dB/km, which is typical for single-mode fibers operating in this wavelength. For a total length of 67 km, the fiber loss amounts to roughly 13.4 dB, satisfying the link budget.

In practical implementation, additional losses due to splicing and connectors must be considered. The use of fusion splicing introduces minimal losses, approximately 0.2 dB per splice. With 13 splices over the span, the cumulative splice loss is 2.6 dB. Connectors, often required for system integration and maintenance, contribute further losses; in this case, three connectors adding 0.5 dB each result in a total of 1.5 dB. Summing the fiber loss, splice losses, and connector losses yields a worst-case total loss of 17.5 dB, comfortably within the SFP's maximum loss tolerance of 20 dB.

Choosing the SFP-10G-LR long reach transceiver would necessitate the addition of optical amplifiers to mitigate the higher attenuation over 67 km. While amplifiers can extend reach and increase system robustness, they significantly increase costs and complexity. The selected solution emphasizes cost efficiency, with the total system expenditure about $33,000, aligning with budget constraints and operational needs.

Further options, such as utilizing the SFP-10G-ZR for even longer distances, improve system reliability and provide additional margin. However, the expense associated with ZR modules is considerably higher, making them less feasible when cost is the primary concern. Therefore, the current configuration offers an optimal compromise between performance and affordability, suitable for medium-range fiber optic links within operational budget constraints.

In conclusion, selecting the appropriate SFP transceiver and carefully accounting for all potential losses are crucial steps in designing reliable and cost-effective fiber optic communication systems. The solution discussed herein demonstrates how standard components, strategic planning, and precise calculations can achieve effective performance within budget limitations.

References

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