If you cannot find an official VLC 1600 datasheet, the part may be:
A datasheet will include a mechanical outline. For a typical VLC 1600 (TO-56 or butterfly package): vlc 1600 datasheet
Dimensions: 5.6 mm diameter TO-can, total height ~5.5 mm. The window is AR-coated for 1500–1650 nm. The Ultimate Guide to the VLC 1600 Datasheet:
A: For wavelength stability or if ambient >40°C, yes. The datasheet's wavelength coefficient is 0.3 nm/°C, which may be unacceptable for DWDM or gas sensing applications. For general use, a passive heatsink with fan is sufficient. Custom/OEM (made for a specific company, not publicly