Ruijie 1Gb SFP BiDi 20 km LC (1550/1310 nm) NIS-GE-SFP-20KM-SM1550-BIDI

Introduction: what the Ruijie 1Gb SFP BiDi (NIS-GE-SFP-20KM-SM1550-BIDI) offers

The Ruijie 1Gb SFP BiDi 20 km LC (1550/1310 nm) — model NIS-GE-SFP-20KM-SM1550-BIDI — is a compact, hot-pluggable single‑fibre optical transceiver designed for 1.25 Gbps (1000BASE‑LX class) Ethernet links. Built to operate over a single strand of single‑mode fibre using a simplex LC connector, it transmits at 1550 nm and receives at 1310 nm, enabling point‑to‑point links up to 20 km. Key features include BiDi single‑fibre operation (saving fibre ports and cabling), Digital Diagnostic Monitoring (DDM/DOM) for live optical metrics, low power consumption (≤ 1.5 W), and compliance with common SFP standards for broad compatibility.

Detailed description: specifications and benefits

• Form factor:SFP (Mini‑GBIC), hot‑pluggable.
• Data rate:1.25 Gbps (1000BASE‑LX).
• Connector:LC simplex for single‑fibre BiDi operation.
• TX / RX wavelengths:TX 1550 nm, RX 1310 nm.
• Reach:Up to 20 km on single‑mode fibre (9/125 µm).
• Optical power & sensitivity:Typical Tx power range ≈ −9.5 to −3 dBm depending on listing; receiver sensitivity typically around < −20 to −22 dBm; overload ≈ −3 dBm.
• Power consumption:≤ 1.5 W.

• Standards compliance:IEEE 802.3z, SFP MSA and related SFF specifications (SFF‑8472, SFF‑8431, SFF‑8432).
• Diagnostics:Supports DDM/DOM (SFF‑8472) for real‑time monitoring of optical parameters such as TX/RX power, temperature, voltage and bias current — useful for proactive troubleshooting.
• Safety & environmental:RoHS and Class 1 laser safety compliant. Standard operating temperature typically 0°C to +70°C; an industrial (NIS) variant may be offered for −40°C to +85°C operation (confirm SKU and temperature rating with your supplier).

• Fibre and port savings:By using BiDi technology over a single fibre strand, you halve the fibre count for each link and reduce the number of duplex ports or transceivers required in long‑haul or constrained cabling environments.
• Easy troubleshooting:DDM/DOM enables network operators to read optical metrics from the host device without special test equipment, speeding fault diagnosis and reducing truck rolls.
• Low operational cost:Low power draw and hot‑swappable operation minimize downtime and reduce energy use in dense deployments.
• Flexible deployment:Works in edge switches, access layer equipment and media converters where single‑fibre runs or limited fibre infrastructure is a constraint.

Use cases and scenarios where this SFP transceiver excels

• Fibre‑constrained links:Buildings, campuses or industrial sites with limited fibre availability benefit from BiDi transceivers because each link needs only a single strand. This is especially useful when running new cabling is expensive or disruptive.
• Metro and access networks:For short metro segments and access aggregation, a 20 km reach covers many campus‑to‑POP or building‑to‑building links without the need for additional optical amplification.
• Industrial & outdoor deployments:When ordering the NIS (industrial) variant, the extended temperature range supports outdoor cabinets, factories, and harsh‑environment installations. Confirm the SKU to ensure you receive the industrial temperature‑rated part.
• Media‑conversion and legacy migration:Use in media converters and legacy interfaces to connect copper-based equipment or older switches to fibre infrastructure while conserving fibre counts.
• Temporary or emergency links:Hot‑plug capability and simple diagnostics make rapid deployment and troubleshooting straightforward for temporary connectivity needs.

Comparisons with similar products on the market

BiDi SFPs like the Ruijie NIS‑GE‑SFP‑20KM are one of several approaches to solving fibre shortage or port limitation challenges. Here are practical comparison points to consider when choosing between BiDi and other transceiver types or vendors.

• Fibre usage:BiDi uses one strand; duplex uses two. If fibre is scarce or conduit capacity is limited, BiDi has a clear advantage.
• Compatibility:Duplex links are straightforward—both ends typically use identical duplex transceivers (e.g., 1310 nm). BiDi links require complementary transceivers (one end TX1550/RX1310, the other TX1310/RX1550). Be sure both ends match.
• Cost and availability:BiDi modules can be slightly more expensive or less commonly stocked than standard duplex modules, but the savings on fibre/civil works often offset module cost differences.

Major networking vendors and optical module manufacturers offer comparable 1Gb BiDi SFPs with similar reach and wavelengths. When evaluating Ruijie against competitors, consider:

• Compatibility & vendor locking:Some network vendors restrict third‑party transceivers via firmware checks; Ruijie modules are designed to fit SFP MSA standards and should work broadly with SFP‑compliant hosts, but verify vendor compatibility lists or test before large rollouts.
• Diagnostics & firmware:DDM/DOM support is common, but the depth and presentation of diagnostic data can vary by vendor and host platform.
• Industrial variants and warranty:Ruijie offers NIS (industrial) variants for extended temperature ranges. Compare the exact temperature specs, warranty and support terms when selecting modules for harsh environments.

Customer testimonials and typical user feedback

There are no verified customer testimonials included with this product brief. However, common themes reported by network engineers and installers using 1Gb BiDi transceivers in production are:

• “Space and fibre savings”:Teams consistently report immediate reductions in fibre usage and easier cable management where single‑fibre BiDi replacements are used.
• “Faster troubleshooting with DDM”:Being able to read optical metrics remotely is frequently cited as a time saver during outages and commissioning.
• “Watch the compatibility”:Technicians often advise confirming the complementary wavelength pairing at the far end and checking that host devices accept third‑party SFPs without vendor lockouts.
• “Industrial reliability”:For outdoor or factory installations, users highlight the value of industrial temperature‑rated variants and recommend verifying the exact SKU and warranty prior to purchase.

Conclusion: why choose the Ruijie 1Gb SFP BiDi 20 km LC

The Ruijie NIS‑GE‑SFP‑20KM‑SM1550‑BIDI is a practical, standards‑based solution for organizations that need reliable 1 Gbps fibre links while minimising fibre use and port count. With single‑fibre BiDi operation, DDM/DOM diagnostics, low power consumption and hot‑swappable convenience, it fits a wide range of access and edge scenarios — from campus cabling constraints to industrial and metro connections. Before purchase, confirm the exact SKU to ensure the temperature rating (standard vs NIS industrial) and warranty meet your deployment needs, and verify compatibility with the host hardware. For installations where conserv­ing fibre, simplifying cabling, and maintaining live diagnostics matter, this Ruijie BiDi SFP is a compelling choice.