Cisco Compatible GLC-BX-U-1310D-40 / BX-D-1550D-40 | 1G BiDi SFP 1310/1550nm 40km

Cisco Compatible GLC-BX-U-1310D-40 / GLC-BX-D-1550D-40 BiDi SFP Transceiver | 1GBASE-BX, 1310/1550nm, LC Simplex, SMF (40km)

Product Overview

The Cisco Compatible GLC-BX-U-1310D-40 and GLC-BX-D-1550D-40 BiDi SFP Transceivers are high-performance 1Gbps single-fiber optical modules designed for long-distance bidirectional transmission up to 40 kilometers over single-mode fiber (SMF). Utilizing advanced Wavelength Division Multiplexing (WDM) technology, they operate on 1310nm and 1550nm wavelengths, enabling full-duplex communication over a single fiber strand.

Compared to standard 1310/1490nm solutions, the 1310/1550nm wavelength combination offers lower attenuation and improved link margin, making it especially suitable for longer or higher-loss fiber links.

Fully compatible with Cisco platforms, these modules provide a reliable, flexible, and cost-effective alternative to OEM optics.

Wavelength Configuration & Pairing

Model	TX	RX	Type
GLC-BX-U-1310D-40	1310nm	1550nm	BX-U
GLC-BX-D-1550D-40	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 40km transmission over SMF

LC simplex connector

Hot-pluggable SFP form factor

Fully compatible with Cisco SFP ports

Reduces fiber usage by 50%

Lower attenuation at 1550nm for improved long-distance performance

MSA compliant and fully tested

Technical Specifications

General Parameters

Form Factor: SFP

Data Rate: 1Gbps

Transmission Distance: Up to 40km

Connector: LC Simplex

Fiber Type: Single-Mode Fiber (SMF)

Optical Characteristics

Transmitter Type: DFB Laser

Receiver Type: PIN or APD Photodiode

TX Power: -3 ~ +2 dBm

RX Sensitivity: ≤ -24 dBm

Electrical & Environmental

Power Consumption: ≤ 1.2W

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 – Why Choose 1550nm?

Parameter	1310 / 1490	1310 / 1550
Attenuation	Standard	Lower (1550nm advantage)
Link Margin	Moderate	Higher
Long-distance stability	Good	Better
Cost	Lower	Slightly higher

Recommendation: Choose 1310/1550nm BiDi modules for 40km links or higher-loss environments where additional optical margin is required.

Applications

Long-distance FTTx deployments

Metro aggregation and backbone networks

Enterprise inter-campus connectivity

ISP and telecom infrastructure

Fiber-limited long-reach environments

Pairing Note (Critical)

BiDi modules must always be used in complementary pairs:

✔ 1310/1550 ↔ 1550/1310 → ✅ Works

❌ Same wavelength modules → ❌ No link

Why Choose This Product

The Cisco-compatible GLC-BX-U-1310D-40 / GLC-BX-D-1550D-40 modules are optimized for long-distance and high-performance single-fiber networks. They offer:

Extended reach up to 40km

Improved optical performance with 1550nm wavelength

Reduced fiber infrastructure cost

Reliable and stable transmission

They are ideal for deployments where distance, performance, and fiber efficiency are all critical.

When to Choose This Module

Choose this 40km (1310/1550) BiDi series if:

✔ Distance requirement is up to 40km ✔ Fiber loss is higher or link quality is uncertain ✔ Need better optical margin ✔ Want to reduce fiber usage

Choose 1310/1490 modules if:

✔ Standard conditions with lower cost priority

Cisco compatible GLC-BX-U-1310D-40 1550nm, GLC-BX-D-1550D-40, 1G BiDi SFP 40km, 1310/1550 SFP, 1000BASE-BX long distance, single fiber SFP Cisco