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100G LR4 to BiDi (Bidirectional) transmission allows upgrading from duplex fiber (LR4) to simplex single-fiber (BiDi) for 100G links, often over 10km–80km. LR4 uses 4 wavelengths (LAN-WDM) on two fibers, while BiDi uses two distinct wavelengths (
) on one strand, providing high-capacity, long-distance connectivity.
Key Aspects of 100G LR4 to BIDI Transmission:
- Fiber Optimization: 100G LR4 uses a duplex LC connector (2 fibers), while BIDI uses a simplex LC connector (1 fiber). BIDI is ideal for fiber-scarce environments, effectively doubling fiber capacity without replacing infrastructure.
- Wavelength Difference: LR4 uses four wavelengths () to transmitsignals. BIDI typically operates at(e.g., in QSFP28 100G-BIDI 80km).
- Transmission Distance:
- LR4: Typically up to 10km or 20km.
- BIDI: Solutions exist for 10km–40km, with some, like the 100G QSFP28 BIDI ZR4, enabling up to 80km, according to 100G BIDI LR1 and ZR4 test results from FiberMall.
- Implementation & Compatibility: BIDI modules must be used in matched pairs (e.g., Module A: Tx 1270nm/Rx 1330nm with Module B: Tx 1330nm/Rx 1270nm). Some 100G-BIDI modules may require disabling FEC (Forward Error Correction) on the switch port, unlike LR4, which typically requires it.
- Hardware Setup: These modules are hot-pluggable and support standard QSFP28 ports.
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100GBASE-SR BiDi QSFP28 Optical Transceiver Module ...
Amazon.com
https://www.amazon.com › QSFP28-Extreme-100GBA...
Amazon.com
https://www.amazon.com › QSFP28-Extreme-100GBA...
With built-in high performance Macom Chip and equipped with individually designed COB packaging, the QSFP28 transceiver offers high speed and low power in 100G ...
30-day returns
100G QSFP28 LR4 DML LWDM4 10km/20km Optical ...
GIGALIGHT
https://www.gigalight.com › 100g-qsfp28-lr4
GIGALIGHT
https://www.gigalight.com › 100g-qsfp28-lr4
GIGALIGHT 100G QSFP28 LR4 optical modules are used for long-distance transmission in the datacom or telecom field and are compliant with IEEE 802.3ba ...
100G QSFP28 Single Lambda BIDI Single Fiber Tranceiver
LightOptics
https://www.lightoptics.co.uk › products › 100g-qsfp28-...
LightOptics
https://www.lightoptics.co.uk › products › 100g-qsfp28-...
100G BIDI LR4 QSFP28 (Quad Small Form-Factor Pluggable 28) Transceiver is designed for operation over Simplex Singlemode Fiber (SMF) up to 10km.Read more
100GBASE-LR Bi-Directional QSFP28 1280/1310nm 20km ...
Guangzhou Ruid Ele-tech CO., LTD.
https://www.fiberwdm.com › 100gbase-lr-bi-directional...
Guangzhou Ruid Ele-tech CO., LTD.
https://www.fiberwdm.com › 100gbase-lr-bi-directional...
The 100G QSFP28 LR4 Bidi transceiver is a four-channel 4x25Gb/s LAN WDM ... 100G QSFP28 CWDM4 optical transceiver module, support 100Gb/s and up to 10 km ...Read more
Understanding QSFP28 SR Transceivers
QSFPTEK
https://www.qsfptek.com › qt-news › 100gbase-sr4-vs-...
QSFPTEK
https://www.qsfptek.com › qt-news › 100gbase-sr4-vs-...
Apr 3, 2025 — The 100G QSFP28 BiDi SR1.2 is a Quad Small Form-factor Pluggable (QSFP28) BiDi optical module, supporting 100Gbps and conforming to IEEE802.3bm ...Read more
QSFP28-100G-BIDI - CloudEngine 16800 Series Switches ...
Huawei Technical Support
https://support.huawei.com › ... › Hardware Description
Huawei Technical Support
https://support.huawei.com › ... › Hardware Description
Dec 1, 2025 — This document provides an overall description of the CE16800 series switches hardware, helping you obtain detailed information about each chassis.Read more
Cisco 100G bidi : r/networking
Reddit · r/networking
10+ comments · 2 years ago
Reddit · r/networking
10+ comments · 2 years ago
Does anyone know if Cisco makes a 100g 10km bidi? I know fiber store and solid optics make some that do work on Cisco devices, ...Read more
100G QSFP28 BiDi : Optical Transceiver Module
NEC Global
https://www.nec.com › ... › Optical Transceiver Module
NEC Global
https://www.nec.com › ... › Optical Transceiver Module
NEC's 100G QSFP28 BiDi optical transceiver enables the transmission and reception of 100Gb/s high-speed data over a single optical fiber.
100G QSFP28 Single Fiber (BiDi) Modules
LINK-PP
https://www.link-pp.com › Resources › Knowledge Base
LINK-PP
https://www.link-pp.com › Resources › Knowledge Base
Aug 20, 2025 — Single fiber QSFP28 modules (commonly called BiDi transceivers) enable full-duplex 100G communication over a single optical strand. They do this ...Read more
100G Over Single Fiber, Simplified
AddOn Networks
https://www.addonnetworks.com › Solutions › Insights
AddOn Networks
https://www.addonnetworks.com › Solutions › Insights
Apr 11, 2025 — Our QSFP28 Bidirectional (Bidi) transceivers delivers high-speed 100G connectivity over a single strand of fiber, with reach options up to 70km.Read more