Multimode and singlemode are the two kinds of fiber optic cable for commercial networks. This post covers how they differ, where each one fits, and how to choose.
Core differences
Core size
Multimode has a larger core, typically 50 or 62.5 microns, which lets multiple light modes travel at once. Singlemode has a much smaller core, about 8 to 10 microns, and carries one mode.
Distance and signal loss
Multimode is for shorter distances, usually up to 300 meters on OM3 and 400 meters on OM4 at 10 Gbps, because signal dispersion limits its reach. Singlemode runs from several kilometers to tens of kilometers with minimal loss.
Light sources
Multimode uses LEDs or vertical-cavity surface-emitting lasers (VCSELs), which cost less but have limited range. Singlemode needs laser diodes, which cost more and are more precise with longer reach.
Cost
Multimode cable and transceivers generally cost less up front. Singlemode components cost more but can pay off on large or long-distance networks.
Where each fits in Los Angeles
Multimode is for short runs inside buildings or campuses, such as office floors and intra-building links under 300 meters. It is common where cost matters.
Singlemode is for long connections, backbones and links between buildings. It suits connecting multiple commercial sites or reaching a data center.
Speed and distance
| Fiber Type | Max Speed | Typical Max Distance |
|---|---|---|
| Multimode | 10 Gbps | Up to 300 to 400 meters |
| Singlemode | 100 Gbps+ | 10+ kilometers |
Multimode is enough for most office and campus runs. Singlemode is the pick when you may need very high speeds over long distances.
Pros and cons
Multimode
Pros
- Lower initial cost for cable and transceivers
- Easier to install and terminate because of the larger core
- Fine for most commercial building networks
Cons
- Limited distance
- Modal dispersion can reduce signal quality on longer runs
- Less suited to very high speeds or long distances
Singlemode
Pros
- Very long distances with low signal loss
- Higher bandwidth and speed potential
- Room to grow
Cons
- Higher cost for components and installation
- Needs more precise handling and termination
- Transceivers cost more
Fiber from Gbit Tech
We install both multimode and singlemode fiber in Los Angeles, mostly for UniFi deployments. If you are unsure which one fits your run, call (818) 809-6743 or email [email protected] and we will go over the distances and equipment with you. See also our fiber optics page.
