lc-apu-upu

LC UPCとLC APCとは何ですか、そしてそれらの主な違いは何ですか?

Basic Definition

LC: Lucent Connector, a small form-factor fiber connector with 1.25mm ceramic ferrule, widely used for SFP/SFP+ optical modules in high-density ports.

UPC / APC refer to fiber end-face polishing types:

  • LC UPCFull name: Ultra Physical ContactEnd face: 0° flat with slight convex dome polishing
ad5106017bead9e8d8deafa64f86cc8atplv a9rns2rl98 pc smart face crop v1 512 384 Supplier of fiber optic patch cables, cat5e/cat6/cat6a Ethernet cables, data transmission cables, audio/video cables, and power cords.
  • LC APCFull name: Angled Physical ContactEnd face: 8° angled bevel polishing
9c358131d1697fe251499f6e4316b123tplv a9rns2rl98 pc smart face crop v1 512 384 Supplier of fiber optic patch cables, cat5e/cat6/cat6a Ethernet cables, data transmission cables, audio/video cables, and power cords.

Core Differences

ItemLC UPCLC APC
End-face Angle0° vertical convex8° angled slope
Housing ColorBlueGreen
Return Loss (RL)≥ -50 dB≥ -60 ~ -65 dB
Insertion Loss (IL)0.2 ~ 0.3 dBSlightly higher ~ 0.3 dB
Reflection FeatureReflected light returns along the original pathReflected light deflects into cladding and dissipates
Application ScenariosData center, enterprise network, multi-mode fiber (OM3/OM4/OM5), general single-mode short/medium transmissionCATV, PON/FTTH, WDM/DWDM, long-haul transmission, reflection-sensitive optical systems
CompatibilityCannot mate with APC directlyMust connect APC to APC only

Selection Rules

Choose LC UPC (Blue)

  • Data center, switch-to-server connection, ordinary fiber transceivers
  • OM3/OM4/OM5 multimode fiber links
  • Common single-mode links without WDM or analog video signals

Choose LC APC (Green)

  • CATV & IPTV broadcast systems
  • PON / FTTH fiber access networks
  • WDM/DWDM long-distance transmission
  • Systems with strict requirements for low reflection and laser service life

Important Note

Do not mix UPC and APC connectors; mismating blue and green connectors will cause severe loss degradation and even damage optical modules. The entire link (patch cord, adapter, device port) must use the same polishing type.

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