The practical difference is which side of the specification boundary you are on. A catalogue L-band EDFA ships with a fixed output power, fixed form factor, and a standard control interface — the system is designed around the amplifier. The WSL Custom EDFA is configured to the project: operating band, output power, pulse regime, cooling, delivery cable, form factor, and control firmware are all specified per build. The amplifier is engineered around the system. The power dimension is where the gap is most pronounced. Most catalogue L-band EDFAs operate well below 50 W average power. WSL builds to 200 W or more, with pulse energies above 10 mJ and peak powers above 100 kW. For demanding or non-standard requirements — high average power, pulsed operation, a specific integration envelope, or a control interface that does not match catalogue options — a purpose-built amplifier is the appropriate choice.

Yes. The WSL platform delivers both C-band (1530–1565 nm) and L-band (1565–1625 nm) from a single source through one cable — no second amplifier is required. For engineers building DWDM systems or multi-band sensing architectures, this means both wavelength ranges are sourced from a single supply point. That simplifies system architecture, reduces component count, and removes the integration complexity of managing two separate amplifier units.

Air-cooled as standard, with water cooling available as a configurable option. Air cooling requires no chiller or coolant loop, which keeps the integration envelope straightforward — no coolant infrastructure to specify, route, or maintain. Water cooling is available for applications where it is preferred or where the installation environment specifies it.

Submit your requirements and WSL's engineers will assess the specification and respond directly — the quote is the start of the engineering conversation, not a sales step. Bring what you know: operating band (C, L, or dual C+L), target output power, pulse regime (CW or pulsed), pulse energy and peak power if applicable, cooling preference, form factor and integration constraints, and any control interface requirements. Requirements that sit beyond published parameters are assessed on a case-by-case basis. WSL does not rule them out in advance. The engagement is with the engineering team directly, so the conversation can go straight into the technical detail from the first exchange.

In optical communications, the L-band spans approximately 1565–1625 nm. It sits above the C-band (1530–1565 nm) within the broader erbium gain window, which covers 1530–1625 nm in total. The ITU-T designates this range the "long wavelength band" (L-band), commercialised in the early 2000s following the C-band. The L-band is used in DWDM systems to extend spectral capacity beyond the C-band, and is increasingly relevant for high-capacity and extended-reach transmission where the C-band alone is insufficient.

An EDFA (erbium-doped fibre amplifier) amplifies optical signals directly in the fibre domain through stimulated emission from erbium ions, without converting signals to electrical form. In a DWDM system, a single EDFA simultaneously amplifies all WDM channels present in its gain window — the amplifier count does not scale with channel count, which is what makes EDFAs the standard technology for long-haul optical transmission. EDFAs operating in the L-band (1565–1625 nm) extend DWDM spectral capacity beyond the C-band; published research in IEEE Xplore has shown that C+L-band transmission can more than double network capacity compared to C-band WDM transmission alone.