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ProductsCisco Compatible GLC-BX-U-1310D-20 / BX-D-1550D-20 | 1G BiDi SFP 1310/1550nm 20km
1.25G BIDI
CISCO Compatible Modules

Cisco Compatible GLC-BX-U-1310D-20 / BX-D-1550D-20 | 1G BiDi SFP 1310/1550nm 20km

Buy Cisco compatible GLC-BX-U-1310D-20 and GLC-BX-D-1550D-20 BiDi SFP modules. 1G single-fiber (1310/1550nm) up to 20km. Reliable and cost-effective.

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Cisco Compatible GLC-BX-U-1310D-20 / GLC-BX-D-1550D-20 BiDi SFP Transceiver | 1GBASE-BX, 1310/1550nm, LC Simplex, SMF (20km)

Product Overview

The Cisco Compatible GLC-BX-U-1310D-20 and GLC-BX-D-1550D-20 BiDi SFP Transceivers are high-performance 1Gbps single-fiber optical modules designed for bidirectional communication over single-mode fiber (SMF). Utilizing advanced Wavelength Division Multiplexing (WDM) technology, they operate on 1310nm and 1550nm wavelengths, enabling full-duplex transmission over a single fiber strand.
With a transmission distance of up to 20 kilometers, this wavelength combination provides enhanced optical performance and lower attenuation, making it ideal for networks requiring stable long-distance links compared to standard 1310/1490nm solutions.
Fully compatible with Cisco platforms, these modules offer a reliable, flexible, and cost-effective alternative to OEM optics.


Wavelength Configuration & Pairing

Model
TX
RX
Type
GLC-BX-U-1310D-20
1310nm
1550nm
BX-U
GLC-BX-D-1550D-20
1550nm
1310nm
BX-D
✔ Correct Pairing: 1310/1550 ↔ 1550/1310 → Full-duplex communication over single fiber


Key Features

  • Supports 1Gbps data rate (1000BASE-BX)
  • Single-fiber (BiDi) transmission via WDM technology
  • TX/RX wavelengths: 1310nm / 1550nm
  • Up to 20km transmission over SMF
  • LC simplex connector
  • Hot-pluggable SFP form factor
  • Fully compatible with Cisco SFP ports
  • Reduces fiber usage by 50%
  • Lower attenuation with 1550nm wavelength
  • MSA compliant and fully tested


Technical Specifications

General Parameters
  • Form Factor: SFP
  • Data Rate: 1Gbps
  • Transmission Distance: Up to 20km
  • Connector: LC Simplex
  • Fiber Type: Single-Mode Fiber (SMF)
Optical Characteristics
  • Transmitter Type: DFB Laser
  • Receiver Type: PIN Photodiode
  • TX Power: -9 ~ -3 dBm
  • RX Sensitivity: ≤ -23 dBm
Electrical & Environmental
  • Power Consumption: ≤ 1W
  • Operating Temperature: 0°C to 70°C
  • Storage Temperature: -40°C to 85°C
Compliance
  • IEEE 802.3ah (1000BASE-BX)
  • SFP MSA compliant
  • RoHS compliant


1310/1550 vs 1310/1490 – What’s the Difference?

Parameter
1310 / 1490
1310 / 1550
Attenuation
Standard
Lower (better reach margin)
Stability (long links)
Good
Better
Cost
Lower
Slightly higher
Typical Use
Standard access
Longer / higher-loss links
Recommendation: Choose 1310/1550 when you need more optical margin or better performance on longer or challenging fiber links.


Applications

  • FTTx and access networks
  • Metro edge deployments
  • Enterprise network extensions
  • ISP and telecom infrastructure
  • Fiber-limited environments


Why Choose This Product

The Cisco-compatible 1310/1550 BiDi SFP series offers:
  • Improved link stability with lower attenuation
  • Flexible deployment for longer or high-loss links
  • Reduced fiber usage by 50%
  • Cost-effective alternative to dual-fiber optics
It is ideal for networks where performance and fiber efficiency must both be optimized.


When to Choose This Module

Choose this series if:
✔ Distance requirement is up to 20km ✔ Fiber quality is not ideal or loss is higher ✔ Need more stable long-distance performance ✔ Want to reduce fiber infrastructure cost
Choose 1310/1490 modules if:
✔ Standard links with lower cost priority




Cisco compatible GLC-BX-U-1310D-20 1550nm, GLC-BX-D-1550D-20, 1G BiDi SFP 1310/1550, 1000BASE-BX 20km, single fiber SFP Cisco, LC simplex BiDi module