When looking at HFBR-2521Z Versatile Link, The Versatile Fiber Optic Connection from Broadcom, one may be confused over its emission wavelength - 600nm or 660nm.
HFBR-2521Z is one of Broadcom’s HFBR-0500Z series products. In the datasheet, the description and feature are just the general information of the HFBR-0500Z series products in 6xx nanometers. But in the part number guide, it shows clearly that HFBR-2521Z is a 600nm emission wavelength product, as shown below.
Applicable Part Numbers
HFBR-2521ETZ HFBR-2522ETZ HFBR-2526ETZ
HFBR-2531ETZ HFBR-2541ETZ HFBR-2542ETZ
HFBR-1521ETZ HFBR-1522ETZ HFBR-1527ETZ
HFBR-1531ETZ HFBR-1541ETZ HFBR-1542ETZ
516-2303-5-ND 516-2305-5-ND 516-2306-5-ND
516-3526-ND 516-3629-ND 516-4079-ND
516-2301-5-ND 516-2302-5-ND 516-2304-5-ND
516-3524-ND 516-3624-ND 516-4077-ND