Overview
IEC 62148-18:2014 specifies the 40-Gbit/s serial physical interface specification for fibre‑optic transmitter and receiver components designed to mate with the LC connector interface. The standard defines the physical, electrical and mechanical requirements needed to ensure mechanical interchangeability of compact optical sub‑assemblies (OSAs) at the PCB level and for panel‑mounting applications. It targets modules used in 40 Gbit/s (and higher) serial transceivers.
Key topics and requirements
- Physical interface and mechanical interchangeability
- Package outline drawings and recommended PCB footprint layouts to ensure consistent mounting and panel integration.
- Panel‑mounting and PCB level considerations to enable plug‑and‑play replacement of modules.
- Electrical interface and terminal assignments
- Block diagrams and terminal numbering/assignment conventions for transmitters and receivers.
- Variants covered: transmitters without thermo‑electric cooler (TEC), transmitters with TEC, transmitters with TEC and built‑in driver, and receiver components (PIN).
- Electromagnetic compatibility (EMC)
- EMC requirements and guidance referenced to IEC Guide 107 to ensure robust operation in real‑world environments.
- Classification and terms
- Standardized classification, definitions and abbreviations for consistent interpretation across suppliers and users.
- Documentation elements
- Drawings, dimension tables and recommended pattern layouts that manufacturers and PCB designers use during product development.
Applications and who uses this standard
- Module and transceiver designers - design 40‑Gbit/s TOSAs/ROSAs that physically and electrically conform to a common LC‑interface package.
- Optical component manufacturers - produce mechanically interchangeable components that can be mounted on customer PCBs or panels.
- System and equipment OEMs - integrate standardized OSAs into routers, switches, transceivers and line cards to simplify sourcing and replacement.
- PCB layout and mechanical engineers - implement recommended footprints and mounting details to ensure compatibility.
- Compliance, procurement and test labs - verify that components meet IEC 62148‑18 interchangeability, EMC and terminal assignment requirements.
Related standards
- IEC 62148‑1 - Fibre optic active components and devices – Package and interface standards – Part 1: General and guidance
- IEC 61754‑20 - LC fibre optic connector interface (mating interface referenced by this part)
- IEC Guide 107 - Electromagnetic compatibility drafting guidance
IEC 62148‑18 is practical for anyone building or integrating high‑speed serial optical modules using the LC connector, providing the mechanical and electrical conventions needed for reliable, interchangeable 40‑Gbit/s modules.