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NEC Corporation has expanded its lineup of optical transceivers for 25Gb/s transmission with the commencement of sales for the "25G SFP28 80km BiDi" capable of 80km transmission. This product enables bi-directional data transmission over a single fiber, reducing the total number of fibers required for a system and achieving lower deployment costs and easier installation. Shipments are scheduled to begin at the end of November 2025.
In recent years, the demand for high-speed, high-bandwidth, high-capacity communication infrastructure has grown significantly due to the increase in mobile network traffic and the rising need for wide-area connections between data centers. Accordingly, there has been a demand for even greater communication capacity than that provided by existing 10Gb/s optical transceivers.
However, the introduction of 100Gb/s-class equipment, such as coherent optical communication technology, has presented challenges in terms of implementation costs and operational aspects. Furthermore, companies engaged in long-distance transmission connecting wide-ranging areas, including regional cities, faced challenges in laying new optical fiber for increased communication capacity and associated operational costs. To address these challenges, NEC developed the 25G SFP28 80km BiDi, which enables easy upgrades from existing 10Gb/s systems.
The 25G SFP28 80km BiDi optical transceiver enables the following:
1. Achieves long-distance transmission with a high link budget
By combining a high-output laser with a high-sensitivity receiver, NEC has achieved a link budget (Note 1) of 30dB, enabling transmission over distances of up to 80km. Furthermore, the new transceiver is suitable for large-scale network construction utilizing sections with high fiber loss or existing dark fiber, enhancing the reliability of wide-area communications.
2. Significantly Reduces Initial Implementation Costs
Using WDM (Wavelength Division Multiplexing) technology with different wavelengths for upstream and downstream, bi-directional transmission over a single fiber has been made possible. This drastically reduces the number of fibers required and lowers overall costs. Furthermore, it eliminates the need for additional relay equipment previously required for extending distances beyond 40km in conventional products. This significantly reduces the burden of infrastructure construction for installation and long-term operational maintenance.
3. Achieves ease of implementation through power-saving design and compatibility with existing equipment
Achieves a power-saving design of 2.5W under industrial temperature conditions (-40 to +85 deg. C.). This represents a reduction of approximately 20% compared to conventional products using optical semiconductor amplifiers, achieving the industry's highest standard (Note 2). Furthermore, it can be directly installed in standard SFP ports, enabling smooth implementation utilizing existing equipment.
Product Specifications
• Form factor: SFP28
• Bitrate: 25.78Gb/s (Ethernet signal)
• Wavelength (Uplink): 1289nm
• Wavelength (Downlink): 1314nm
• Link Budget: 30dB
• Optical Interface: 25.78Gb/s (NRZ)
• Electrical Interface: 25.78Gb/s (NRZ)
• Power consumption: 2.5W (Max.)
• Operating temperature: -40 to +85 deg. C.
Going forward, NEC will continue contributing to the advancement and energy efficiency of network infrastructure, aiming to realize a sustainable society.
(Note 1) In optical communication networks, an indicator representing the balance between signal loss between the transmitter and receiver and the gain required for signal reception.
(Note 2) Based on NEC research
About NEC Corporation
NEC Corporation (nec.com) has established itself as a leader in the integration of IT and network technologies while promoting the brand statement of “Orchestrating a brighter world.” NEC enables businesses and communities to adapt to rapid changes taking place in both society and the market as it provides for the social values of safety, security, fairness and efficiency to promote a more sustainable world where everyone has the chance to reach their full potential.
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