NEC Broadens Selection of Optical Transceivers for 100Gb/s Transmission

With today’s launch of the new “100G QSFP28 ZR4 BiDi,” which increases transmission distance to 80km, NEC Corporation has broadened its selection of optical transceivers for 100Gb/s transmission. This device is an enhanced dual-fiber 100Gb/s transceiver that utilizes two fibers to transmit data in both upstream and downstream directions by utilizing a single fiber.

Data traffic has increased over the past few years due to the growth of AI and video distribution services, and there will likely be a greater need for optical transceivers to link data centers. Reducing the overall power consumption, latency, and cost of systems is a constant issue in response to the rise in data traffic.

Instead of employing a coherent technique, this optical transceiver uses a direct detection method to achieve high-capacity communication over up to 80 km. Low-power, low-latency, and inexpensive direct connections between data centers are made possible by its ability to accomplish bi-directional communication over a single fiber. This helps to reduce the overall cost, latency, and power consumption of the optical network system.

Features of the new product include the following:

1. Achieving cost efficiency

This time, bi-directional transmission has been accomplished with a single fiber by wavelength multiplexing with different wavelengths for upstream and downstream. Previously, two fibers were needed for 100Gb/s transmission; however, a compact filter that combines and separates the transmission and reception wavelengths has been developed. A cost-effective network can be built by lowering the number of fibers used, which will lower the expenses of fiber rental and procurement.

2. Achieving high-quality long-distance transmission

High-output transmission is made possible by securing the necessary link budget (*) of 30dB for 80km transmission by combining an optical semiconductor amplifier on the receiving end with a high-output laser on the transmitting end. Furthermore, NEC offers solutions that support both the OTU4 signal rate (111.8Gb/s) and the Ethernet signal rate (103Gb/s).

3. Connection with existing devices is possible

It can be simply added to existing QSFP28 ports because it has the same electrical interface as standard 100G QSFP28 devices and has a power consumption specification of 5.5W or less. Additionally, compared to coherent approaches, it achieves low latency and low cost because it employs a direct detection mechanism.

Product Specifications

NEC will keep offering optical transceivers with cutting-edge features, such its single-fiber bi-directional technology, to both domestic and foreign markets in the future.

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