ONU s Pon-type pigtail

ONU PON devices typically use a single-fiber bi-directional pigtail with integrated WDM for upstream and downstream transmission.

Most modern ONUs, including GPON, XGS-PON, and 25GS-PON, employ single-fiber pigtails that carry both upstream and downstream signals simultaneously using different wavelengths. For example, XGS-PON ONUs use a 1270 nm transmitter and 1577 nm receiver in a single fiber with integrated WDM filters for bi-directional operation, while GPON ONUs often use 1310 nm upstream and 1490 nm downstream on a single fiber pigtail. The pigtail is typically terminated with standard connectors such as SC or LC depending on the module design . Key characteristics of ONU pigtails:

• Single-fiber bi-directional design: Supports both upstream and downstream on one fiber.
• Wavelength division multiplexing (WDM): Separates transmit and receive wavelengths within the same fiber.
• Connector type: Commonly SC or LC connectors for easy integration into PON networks.
• Laser and receiver types: DFB lasers for transmission and APD or PIN photodiodes for reception.
• Application: Compatible with GPON, XGS-PON, and higher-speed PON standards like 25GS-PON . This design simplifies fiber deployment, reduces cabling complexity, and ensures compatibility with standard PON OLTs and splitters.