IEC 62148-15:2021 is available as IEC 62148-15:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 62148-15:2021 covers the physical dimension and interface specifications for discrete vertical cavity surface emitting laser (VCSEL) devices in optical telecommunication and optical data transmission applications. The intent of this document is to adequately specify the physical requirements of VCSEL devices that will enable mechanical interchangeability of laser devices or transmitters complying with this document both at the printed circuit wiring board and for any panel-mounting requirement. This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- the classification of optical/electrical interface types is generalized and referred to IEC 62148-1;
- a new pin mode is added to Table 1;
- several dimensions of the VCSEL TO CAN package are changed in Table 3 to reflect the current state of technology;
- Figure 7 is updated to show the complete details of the VCSEL TOSA package.