The Single Channel Erbium-Doped Fiber In-Line Amplifier for C-band is a high‑performance optical amplifier specifically engineered for mid‑span signal boosting in modern fiber networks and laser systems. Designed around a high-gain erbium-doped fiber core and optimized for the 1530–1565 nm C-band window, this in-line amplifier delivers strong optical gain with low noise, enabling efficient extension of transmission distances and reliable power scaling. It is ideally suited for use as a line amplifier in long‑haul and metro fiber communication links, as well as in demanding fiber laser and fiber sensing architectures where stable, high‑quality amplification is essential.

Unlike simple pre‑amplifier or booster amplifier stages, this device integrates the functional advantages of both PA and BA configurations into a single in‑line module. It offers high small‑signal gain and saturated output power options from 13 dBm up to 26 dBm (typical, at −10 dBm input), with a wide dynamic input range from −25 dBm to −3 dBm. This allows system designers to efficiently compensate for fiber attenuation, splitter losses, and passive component insertion losses across a broad variety of network topologies, including single‑span links, multi‑span relays, and single‑to‑multipoint access segments. The relatively low typical noise figure of about 5.5 dB at −10 dBm input helps preserve signal integrity and OSNR in both analog and digital transmission systems.

The amplifier is based on standard SMF‑28 fiber, with FC/APC connector interfaces for straightforward integration into existing optical infrastructures. Its gain flatness of approximately 3 dB across the C‑band helps maintain consistent performance over multiple DWDM channels, while polarization dependent gain below 0.5 dB and polarization mode dispersion under 0.5 ps minimize polarization‑related signal distortions. High input/output isolation greater than 35 dB further protects upstream and downstream components from unwanted back reflections and amplified spontaneous emission, supporting robust operation in complex, cascaded optical systems.

For system control and integration flexibility, the amplifier supports both Automatic Current Control (ACC) and Automatic Power Control (APC) modes, enabling stable operation under varying input conditions and simplifying power management in dynamic networks. Users can choose between a compact module package and a desktop unit. The module version offers a low‑power 5 V DC supply and RS232 control interface, making it easy to embed into OEM equipment, test platforms, and rack‑mounted subsystems. The desktop configuration is powered from 100–240 V AC and provides front‑panel button control for lab environments, prototyping, and small‑scale deployments without the need for additional control electronics.

Engineered for real‑world deployment, this C‑band in‑line EDFA operates over a broad temperature range from −5 °C to +55 °C and humidity from 0 % to 70 %, ensuring reliable performance in both controlled laboratory settings and field installations. Typical use cases include extending reach in long‑haul backbone links, reinforcing power in metro and access networks, compensating splitter and filter losses in PON and WDM systems, boosting return signals in fiber sensing arrays, and providing gain stages within fiber lasers and amplified light sources. Its combination of high gain, flexible output power levels, wide dynamic range, and compact form factor makes it a versatile, cost‑effective solution for upgrading existing C‑band infrastructure and for building new high‑capacity optical platforms.