How to check if the optical module is OM3

You can determine if an optical module is OM3 by checking its specifications, fiber core size, jacket color, or using device commands to display transceiver information.

Visual and Physical Inspection

Fiber Core Size: OM3 multimode fiber has a 50 µm core diameter and is laser-optimized for VCSELs, unlike OM1 (62. 5 µm) or OM2 (50 µm but LED-optimized) fibers. Jacket Color: OM3 cables typically have a aqua-colored jacket, which distinguishes them from OM1/OM2 (orange) and OM4 (also aqua but with labeling),.

Labeling: Many OM3 modules or cables are labeled with “OM3” on the connector or packaging.

Using Device Commands

If the module is installed in a switch or router, you can use commands to check its type: Huawei Devices: Run display transceiver [interface interface-type interface-number | slot slot-id] to view detailed optical module information, including type, wavelength, and supported distances. Diagnostic Commands: display transceiver diagnosis interface [interface-type interface-number] provides digital diagnostic monitoring (DMM) data, which can indicate whether the module is multimode and its specifications. Other Vendors: Most modern switches support similar commands (e.g., Cisco's show interface transceiver) to display module type, speed, and supported fiber type.

Performance-

Based Verification

Bandwidth and Distance: OM3 supports 2000 MHz·km modal bandwidth and is suitable for 10G Ethernet up to 300 meters, 25G up to 70 meters, and 40G/100G up to 100 meters. If your module supports these distances and speeds over multimode fiber, it is likely OM3.

VCSE

L Compatibility: OM3 is laser-optimized, so modules designed for VCSEL-based transmission are typically OM3 or higher.

Summary

To confirm an optical module is OM3: Check the fiber core size (50 µm) and jacket color (aqua). Look for OM3 labeling on the module or cable. Use device commands to display transceiver information and verify multimode type, wavelength, and supported distances.

Confirm performance specifications match OM3 standards (2000 MHz·km, 10G/25G/40G/100G support). Combining visual inspection with device diagnostics ensures accurate identification of OM3 optical modules.