BiDi transceivers: one fibre, two wavelengths, and the pairing rule that catches everyone
BiDi transceivers do something that sounds like it should not work: they carry a full-duplex link over a single strand of fibre. One strand, both directions, at the same time. They are also the source of more confused ordering than any other part of the optics catalogue — because the word “BiDi” is used in […]
The real TCO of 400G: power, price and compatibility
The real 400G transceiver cost is not the price on the optic, and every 400G business case starts the same way. Someone divides the price of a 400G optic by the price of a 100G optic, sees a number that looks bad, and the conversation stops there. It is the wrong sum. Not because 400G […]
Juniper QFX5120 compatible optics: the full list
Choosing QFX5120 compatible optics is more interesting than it looks. The QFX5120 is the switch a lot of data centre leaf layers ended up standardising on, and two things decide what you can plug into one: which model you have, and — on the 25G models — which group of four ports you are plugging […]
Catalyst 9300 and 9500 compatible optics: what works, by model and module
The Nexus range gets the data-centre attention, but the switches that actually carry most UK enterprises are Catalyst 9300s in the wiring closet and Catalyst 9500s in the core. And the optics question on Catalyst is structurally different from Nexus: on most 9300s the switch itself has no optical ports at all. The question is […]
SFP-10G-SR: the full specification and every part number
SFP-10G-SR is the most deployed 10G optic in the world. It is also the one most often ordered by the wrong name, populated into fibre that cannot carry it, and blamed for faults it did not cause. This is the reference page for it: what the standard actually specifies, how far it genuinely goes on […]
Nexus 9300 compatible optics: which transceiver works in which model
If you run Nexus 9300s, you have asked it. Choosing Nexus 9300 compatible optics should be a two-minute job, and it never is — because Cisco splits the answer across a datasheet, a hardware installation guide, an interfaces configuration guide and a compatibility matrix that only works in a browser. Nobody has all four open […]
1.6T Optical Transceivers: What Changes at 200G Per Lane
Every jump up the Ethernet speed ladder gets described the same way: twice the bandwidth in the same footprint. It is true of 1.6T, but it is also the least interesting thing about it. The change that actually matters is underneath. 1.6T is the first mainstream generation built on 200 Gigabits per second per lane, […]
Preparing for 800G Networking: How Next-Generation Optical Transceivers Are Transforming Data Centres
Data centres are being pushed harder than ever. Artificial intelligence, machine learning, cloud platforms, high-performance computing and real-time digital services are all creating huge increases in bandwidth demand. As a result, network operators are having to rethink how they design, scale and future-proof their infrastructure. For many organisations, 100G, 200G and 400G networks have already […]
How the Optical Transceiver Industry Is Evolving for the Next Generation of Networks
The optical transceiver industry is changing quickly. As networks carry more data, support more cloud services and connect increasingly demanding digital infrastructure, optical modules are no longer viewed as simple plug-in components. They are now a critical part of network performance, scalability, energy efficiency and long-term upgrade planning. For telecom operators, data centres, enterprises, cloud […]
Why 200G QSFP-DD Transceivers Are a Practical Upgrade Path for High-Capacity Networks
As network traffic continues to grow, many organisations are looking for ways to increase capacity without immediately jumping into a full 400G or 800G migration. For data centres, telecom operators, cloud environments and enterprise networks, 200G connectivity can provide a practical middle step between established 100G infrastructure and next-generation high-speed optical networks. 200G transceivers can […]
