Not all 1550 nm EDFAs are the same — and the headline spec sheet rarely tells the whole story. The axes below are the ones that separate a well-matched amplifier from one that causes problems six months into deployment.

• Output power and scalability: Saturated output power figures can mislead: actual delivered power depends on input conditions. For high-power applications, treat the full configurable power range as a primary filter, not the headline dBm figure.
• Gain and noise figure: Gain sets amplification depth; noise figure (NF) sets the SNR degradation the amplifier introduces. NF matters most in cascaded chains and preamplifier roles, where noise accumulates across every stage.
• C-band wavelength coverage: The standard EDFA gain window runs 1530–1565 nm, but some catalogue units cover only the red C-band (1540–1563 nm). Verify the exact operating window before assuming full C-band coverage.
• Control modes and interfaces: APC maintains constant output power by adjusting the pump; AGC maintains constant gain. For deployed DWDM or CATV infrastructure, NMS integration via Ethernet or SNMP is a standard requirement.
• Form factor: Module formats suit OEM integration; benchtop suits lab R&D; rack-mount suits deployed network infrastructure. The right choice is determined by deployment context, not performance preference.
• Connectors and lead times: Ask vendors about connector type, patch-cord options, and key width before ordering — these details vary by configuration. Ask about current lead times too, especially for made-to-order units.

Two of these axes are consistently underserved in vendor literature, and both are worth investigating before you shortlist.

Manufacturer vs. reseller: ask the question directly

A vendor who designs and manufactures in-house can offer genuine engineering support, adapt a design post-delivery, and stand behind a specification they created themselves.

Resellers and importers typically cannot offer this depth — they can fulfil a catalogue order, but they cannot modify the product or provide the engineering dialogue that demanding applications require. Ask any vendor directly: do you design and manufacture this unit?

Customisation depth: catalogue vs. engineered-to-requirement

A fixed-catalogue EDFA is a sound choice when the published specification matches the requirement off the shelf — there is no premium worth paying for customisation you do not need.

For non-standard applications — high average power, unusual pulse regimes, bespoke form factors, or specific control interfaces — a platform engineered to the requirement will outperform a catalogue unit adapted to fit. The practical question is whether the vendor's platform can be configured to your requirement, or whether you are being sold the closest available approximation.

With these axes in mind, the entries below can be read as a structured comparison rather than a catalogue — each one assessed against the same framework.

Woodrow Scientific (WSL) is a UK manufacturer of erbium-doped fibre amplifiers, designing, building, qualifying, and supporting every unit in-house from its Southampton facility — the city where the EDFA was invented, at the Optoelectronics Research Centre.

That provenance matters in practice: WSL's engineering team works directly with customers through integration, and because the amplifier is built in-house on patented technology, post-delivery adaptability is a real option rather than a support-desk conversation with a reseller.

End-to-End Customisation

The defining characteristic of the WSL platform is the depth of per-project configuration available — not a choice of catalogue variants, but a unit engineered from the ground up to the customer's specification.

Every parameter in the following list is configured per project, with the erbium physics and MOPA architecture as the only fixed foundations.

• Operating band: C-band, L-band, or dual C+L — specified per project.
• Output power: From low-power builds (e.g. 5 W) to 200 W or more average power; fully controllable from 0–100% of rated output.
• Pulse regime: CW, short-pulse (e.g. 100–500 ns), or custom — including pulse energies above 10 mJ and peak powers above 100 kW.
• Cooling: Air-cooled as standard, requiring no chiller or coolant loop; water cooling available as an option.
• Delivery cable: Length and termination configured per project.
• Form factor: Custom integration envelope to match the deployment context.
• Control firmware and comms: RS-232, Ethernet, SNMP, or bespoke — WSL builds the control interface to the buyer's requirements.

This level of tailoring is what separates a purpose-built amplifier from a catalogue part, particularly for demanding deployments where the integration envelope, thermal management, or control interface cannot flex to meet a fixed-spec product.

Output Power and Scalability

WSL builds to 200 W or more average power — the highest commercially available for erbium-doped fibre amplifiers — with output continuously controllable from 0 to 100% of rated power.

For pulsed applications, the platform supports pulse energies above 10 mJ and peak powers above 100 kW, making it viable for demanding short-pulse work that fixed-catalogue amplifiers rarely reach.

Gain, Noise Figure, and MOPA Architecture

WSL does not publish fixed gain or noise figure values, because both are engineered to the application rather than drawn from a standard specification sheet.

Buyers specify their gain and noise figure requirements as part of the project brief; WSL's engineers optimise the gain medium within the MOPA architecture accordingly — a more accurate representation of capability than a fixed NF figure that may not reflect the actual operating condition.

Wavelength Coverage: C-Band and L-Band

The platform covers the full 1530–1625 nm window, spanning C-band (1530–1565 nm) and L-band (1565–1625 nm).

Crucially, both bands are available from a single source through one cable — no second amplifier, no additional integration complexity.

Form Factor, Cooling, and Certifications

Every WSL unit is built to a custom integration envelope, so the form factor is not a constraint the buyer works around — it is a parameter they specify.

Air cooling is standard, meaning no chiller or coolant loop is required and integration is straightforward; water cooling is available for deployments where it is preferred.

Units are CE and UKCA certified and ship worldwide direct from WSL.

Eye-Safe 1550 nm Operation

The 1550 nm wavelength carries a significantly higher eye-damage threshold than 1064 nm sources, a practical advantage in applications where personnel work in proximity to the beam.

WSL offers reduced-hazard-zone builds for deployments where minimising the laser safety exclusion area is a design requirement.

Application Fit

The platform's configurable nature means application fit is broad — the list below reflects illustrative deployments, not a closed set.

• LiDAR: Eye-safe high-power amplification for LiDAR systems.
• Free-space optical communications (FSOC): Ground-station uplink and beacon amplification — the EDF-UL-10 is an illustrative build for this application.
• Short-pulse applications: High peak-power pulsed amplification — the EDF100 is an illustrative build for this regime.
• Defence and directed-energy research: High-power fibre amplification for directed-energy and defence R&D programmes.
• Quantum sensing and communications: Precision amplification in the 1550 nm window for quantum photonics applications.
• Fibre sensing (DAS / structural): Amplification for distributed acoustic sensing and structural health monitoring.
• Remote sensing and scientific instrumentation: Tailored amplifiers for laboratory, field, and research instrument integration.

If an application requires a high-power, eye-safe 1550 nm erbium-fibre amplifier, WSL's engineers assess each requirement individually — the platform is not limited to the use cases listed above.

Woodrow Scientific Custom EDFA: Key Specifications

To specify a unit, buyers submit their requirements directly to WSL for a specialist evaluation — the starting point is the application, not a catalogue page.

Thorlabs' EDFA100 and EDFA300 series are core-pumped, turnkey 1550 nm erbium-doped fiber amplifiers offered in two distinct form factors: benchtop systems and PXIe 2-slot plug-in modules.

The two series differ primarily in output power and gain ceiling, with both available in single-mode (SM) and polarisation-maintaining (PM) fibre variants, and each form factor carrying the same optical performance as its counterpart.

EDFA100 vs EDFA300: Performance at a Glance

The table below shows the key performance figures for both series, tested at the stated input power conditions published on the Thorlabs product pages.

The EDFA300 series delivers higher output power and significantly higher small-signal gain than the EDFA100, making it the stronger candidate for booster amplifier roles in data communication links.

The EDFA100's low total internal dispersion is the standout figure for ultrafast pulse work — Thorlabs describes this series as designed for femtosecond pulse amplification, with dispersion-compensating patch cables available on request.

Both series cover the 1530–1565 nm C-band window, which is the relevant scope boundary for readers evaluating L-band or dual-band requirements.

Control Modes by Variant

Control capability varies across variant types and is worth mapping carefully for readers integrating these amplifiers into automated test environments.

• EDFA100 Benchtop: Constant current mode, via front panel controls or remote USB connection.
• EDFA100 PXIe Modules (EDFA100SX / EDFA100PX): Constant current, constant power, and constant gain modes, controlled via computer connection to a PXIe chassis.

Readers working in PXI-based test systems will note that the EDFA100 PXIe module variants add constant power and constant gain modes beyond what the EDFA100 benchtop supports — a material capability difference for automated measurement workflows.

Form Factor and Operating Conditions

The benchtop units run from mains voltage (100–240 VAC), while the PXIe modules draw power from the chassis — a practical distinction for lab infrastructure planning.

All variants use FC/APC connectors with 2.0 mm narrow key on both input and output ports, with SM variants using SMF-28-J9 fibre and PM variants using PM1550-XP.

Operating temperature ranges differ between series and are a meaningful constraint for deployment context: the EDFA100 series is rated for 15–35 °C, while the EDFA300 series is rated for 15–30 °C. Both ranges are consistent with controlled laboratory environments.

Application Fit

These amplifiers are well suited to lab R&D, test and measurement, component characterisation, preamplifier or booster roles in data communication links, and ultrafast pulse applications where dispersion control is critical.

The output power ceilings across both series place them outside the scope of high-power applications, and the operating temperature constraints limit use outside controlled environments.

Thorlabs EDFA Pricing

Current pricing is available directly from the Thorlabs website or by contacting Thorlabs' sales team.

The Keopsys CEFA series, marketed under the Lumibird brand (Keopsys is the Lumibird subsidiary), is one of the broadest catalogue EDFA families commercially available, spanning ten distinct sub-models across C-band and L-band, from high-gain metrology amplifiers to high-power scientific and industrial units.

Unlike narrower catalogue ranges, the CEFA family is structured so that different sub-series address genuinely different engineering requirements — the choice of model is driven by application, not just output power.

Output Power Range Across the CEFA Family

Output power spans a wide range across the family, from standard scientific models up to high-power units that Keopsys lists at up to 43 dBm.

The CEFA-C-PB-HP is a multi-stage C-band amplifier that accepts input signals down to -20 dBm and delivers up to 43 dBm, with polarisation-maintaining options available even at maximum output power.

The CEFA-C-BO-HP is a distinctive variant: it delivers its output as a free-space beam rather than a fibre-coupled signal, with Keopsys specifying beam quality of M² less than 1.1 — a characteristic relevant to sensing and focusing applications.

CEFA-C-HG: High-Gain Series

The CEFA-C-HG is the family's most technically differentiated model and the one on which the CEFA range most clearly leads relative to typical catalogue EDFAs.

Keopsys lists quantum cryptography, optical metrology, optical remote sensing, and test and measurement among the CEFA-C-HG's target applications.

The all-fibre design eliminates free-space alignment, and Keopsys states the device is available in both benchtop (front-panel or RS-232/RJ45 with SNMP) and compact OEM module formats.

Wavelength Coverage: C-Band and L-Band

The CEFA family covers both C-band (CEFA-C sub-series) and L-band (CEFA-L sub-series) as separate product lines, each available in its own benchtop or OEM module configuration.

The CEFA-L-PB-HP operates from 1565 to 1605 nm, with extended ranges available on request according to Keopsys.

Control Interfaces and Operating Modes

Interface options vary by model and power level across the family, with RS-232, USB, and RJ45 all represented in the catalogue.

• CEFA-C-PB-HP benchtop: Front-panel control or RS-232/USB; RJ45 interface available for models below 33 dBm output.
• CEFA-C-PB-LP benchtop: RJ45 interface for network control; compact OEM module available.
• CEFA-C-HG benchtop: Front-panel, RS-232, or RJ45 with SNMP; compact OEM module also available.
• OEM module variants (general): Controlled via RS-232 across the range; designed for integration into complex optoelectronic systems.

Keopsys lists a low noise figure among the key features of the CEFA-C-PB-HP, alongside an excellent optical signal-to-noise ratio at the output.

Application Fit by Sub-Series

The breadth of the CEFA family maps directly to a wide spread of application contexts, with Keopsys positioning each sub-series against distinct use cases.

• CEFA-C-HG: Optical metrology, quantum cryptography, optical remote sensing, high-sensitivity preamplification — where very low input power and near quantum-limited noise figure are the primary requirements.
• CEFA-C-PB-HP: Scientific applications including atomic cooling, quantum optics, nanotechnologies, material characterisation, non-linear optics, and microwave optics.
• CEFA-C-BO-HP: Remote sensing (LIDAR), non-linear optics, optical component testing — applications where free-space beam output and high beam quality are advantageous.
• CEFA-C-WDM-LP: Dense wavelength division multiplexing (DWDM), regional and metro networks, FTTH/CATV, and free-space communication — with dynamic gain control for optimum gain flatness across multiple channels.
• CEFA-L-PB-HP: L-band DWDM transmission, free-space communication, LIDAR, biotechnologies, and material characterisation — covering the 1565–1605 nm window.

The CEFA family's catalogue structure means models are selected from a defined range rather than engineered to a per-project specification — a straightforward trade-off between breadth of choice and the depth of customisation available from bespoke EDFA suppliers.

Nuphoton Technologies, based in Murrieta, California, manufactures a catalogue of C-band erbium-doped fibre amplifiers spanning compact OEM modules through to rack-mount units, with published datasheets covering output power, gain, noise figure, dimensions, and interface specifications for each model.

The range's clearest differentiator is its module footprint: the EDFA-CW-C0-HR-17-20-FCA measures just 71 × 43 × 12 mm, and the SubMR-30 model measures 80 × 50 × 12 mm — both running from low-voltage DC supplies, which makes them well-suited to board-level and system integration.

Nuphoton EDFA Key Specifications by Model

The table below summarises key specifications across six models in the Nuphoton catalogue.

The EDFA-CW-C0-SMR-34-40-FCA stands out within the module sub-range for its 30–40 dB adjustable gain at +34 dBm output — the only model in the catalogue with a published variable gain range rather than a fixed gain point.

Nuphoton's published datasheet for the PM-RS-37 model (EDFA-CW-C0-PM-RS-37-47-FCA) states a gain of 47 dB; the model's product page states 40 dB. The PM-RS-37 also carries a polarisation extinction ratio of ≥20 dB, making it relevant for polarisation-sensitive system architectures.

Control Modes and Interface

RS-232 is the standard control interface across the catalogue, present on every model from the 71 mm compact module to the 19-inch rack-mount unit.

Most models support both AOPC (constant output power) and ACC (constant pump current) operating modes; the SubMR-30 and PM-RS-37 models operate in ACC mode only, as stated on their respective product pages.

The SubMR-30 and SMR-34 module variants also expose an LVTTL UART interface directly from the unit, alongside RS-232 — a detail relevant to embedded integration where RS-232 voltage-level translation would otherwise be required.

The rack-mount PR-34 model adds front-panel control alongside RS-232, which is consistent with its 19-inch form factor and infrastructure deployment context.

Application Fit

Nuphoton's product pages list applications including optical telecom booster and in-line amplification, fibre optic sensing, test and measurement, and laboratory R&D across the compact module range.

The catalogue also includes a DWDM-capable model (EDFA-CW-C4-HR-16-20-FCA), covering 1530–1565 nm across multiple C-band channels at +16 dBm output and 20 dB gain in the same 71 × 43 × 12 mm footprint as the single-channel HR-17.

Notably, the catalogue includes the EDFA-CW-RS-CL0-30-27-FCA, a combined C+L band module covering 1535–1563 nm (C-band) and 1570–1605 nm (L-band) at +27 dBm output — which separates Nuphoton from a strictly C-band characterisation of the range.

The EDFA-CW-C0-VRS-30-30-FCA, listed on Nuphoton's site with flight heritage across multiple short missions, operates across −10 to +55 °C in vacuum conditions (≤7.5 × 10⁻⁵ torr by design) — a specification profile distinct from the standard commercial module range.

Nuphoton EDFA Pricing

Pricing is not published on Nuphoton's product pages; prospective buyers should contact Nuphoton directly at their Murrieta, California facility for pricing and availability information, including for international orders.

Agiltron, based in the United States, manufactures a broad catalogue of 1550 nm erbium-doped fiber amplifiers spanning standard C-band booster and pre-amplifier units, a dedicated pulsed amplifier for LiDAR and sensing applications, and a multiport rack-mount series built for FTTx network infrastructure.

The range is notable in this list for two characteristics that appear in no other entry: a purpose-built pulsed EDFA variant and a multiport SNMP-managed amplifier chassis — both available as catalogue products with published pricing.

Performance and Specifications

The standard EDFA datasheet lists booster output power up to 41 dBm and pre-amplifier output power up to 25 dBm, with optical gain of up to 40 dB for both configurations.

Standard models operating below 25 dBm cover 1528–1565 nm; higher-power versions operate within 1535–1565 nm.

The Mini EDFA (MEDF) covers 1528–1565 nm and offers the broadest wavelength window in the standard range, making it the variant to note where full lower-C-band coverage matters.

The EDFA-P pulsed amplifier operates from 1540 to 1560 nm and delivers peak pulse output power up to 100 W, with pulse widths from 10 to 200 ns and repetition rates from 5 to 20 kHz.

The EDAR multiport series covers 1540–1560 nm, with per-port output power ranging from 17 to 23 dBm across configurations of 4 to 64 output ports, and a noise figure of 4.5 dB at 6 dBm input power per the MultiC EDFA datasheet.

Agiltron's C-band EDFA category page states that the range offers an extended operating temperature of -25 to 70 °C, with the standard operating range being -5 to 40 °C and the extended range available at additional cost.

Control Interfaces and Form Factors

The standard EDFA supports ACC (Automatic Current Control) and APC (Automatic Power Control) modes, with USB and RS-232 communication interfaces; benchtop units include a computer control interface and GUI.

Three form factors are available for the standard EDFA: a benchtop unit, a compact OEM module, and a pluggable rack-mount configuration with an associated net-control rack.

The EDFA-P module variant uses RS-232 serial communication via a DB9 female connector, with module dimensions of 125 × 150 × 31.5 mm and benchtop dimensions of 255 × 285 × 115 mm. Agiltron's pulsed EDFA datasheet notes a space-qualifiable version is available.

The EDAR multiport series is housed in a 19-inch rack-mount chassis available in 2U, 3U, and 4U configurations, with redundant power supplies and SNMP support as standard features.

For buyers integrating the EDAR into managed network infrastructure, SNMP support covers the standard NMS integration path for FTTx and RF video overlay deployments. Beyond SNMP, no published Ethernet-based NMS integration is listed for the multiport series.

Application Fit

Agiltron's own product pages describe the following application fits across the range.

• EDAR Multiport: FTTx networks and RF video overlay networks requiring SNMP-managed amplification across multiple output ports, including mid-sized municipal networks and large Tier 1 service provider deployments.
• EDFA-P Pulsed: Doppler LiDAR, fiber optic distributed sensing, and narrow-linewidth pulse amplification where nonlinear suppression is required.
• Standard EDFA: DWDM booster and pre-amplifier roles, supporting up to 96 channels at 50 GHz spacing in the OPA/OBA rack-mount variant.

The EDAR series also supports integrated CWDM splitters, enabling routing of 1310 nm and 1490 nm data streams alongside the amplified 1550 nm signal in FTTx architectures.

Agiltron EDFA Pricing

Agiltron lists pricing on its category page. Agiltron's C-band EDFA category page lists the Mini EDFA from $1,250, and the pulsed EDFA-P from $5,560. The OPA/OBA rack-mount series and EDAR multiport starting prices are also listed on Agiltron's category page, where figures vary by configuration and port count.

The first question to resolve is always output power: fixed-catalogue units serve a wide range of standard applications well, but the moment a requirement pushes beyond what off-the-shelf power levels can deliver, the shortlist narrows sharply.

The second is customisation depth — whether the deployment context, pulse regime, form factor, or control firmware can be matched from a catalogue, or whether the application demands a platform engineered specifically to it.

For requirements that push hardest on both axes, this page's recommendation is the Woodrow Scientific Custom EDFA: end-to-end customisation, the highest commercially available power levels, and in-house engineering support throughout.