According to the data sheet for the third party SFP I am using the optical receive range is from 1200 to 1600nm. While the minimum receive is -13.2dBm for the SFP, the SFP does appear to be capable of measuring accurately down to -28dBm.
My light source is an Anristu light source 1310 and 1550nm and according to the datasheet has a launch power of -7dBm for both 1310nm and 1550nm. With no attenuation added I was measuring -5.9 at 1550nm and -5.5 at 1310nm.
While SFF-8472 states that the optical power receive accuracy must be better than +/-3dB clearly my third party SFP was remarkable accurate when compared to my nice expensive calibrated power meter.
| Added Attenuation | 1550 | Meter | sfpduino | 1310 | Meter | sfpduino |
| 0dB | -5.90dBm | -5.81dBm | -5.50dBm | -5.50dBm | ||
| 5dB | -10.50dBm | -10.11dBm | -10.10dBm | -10.12dBm | ||
| 8dB | -13.50dBm | -13.51dBm | -13.90dBm | -13.59dBm | ||
| 11dB | -17.10dBm | -17.21dBm | -17.90dBm | -17.93dBm | ||
| 14dB | -19.40dBm | -19.59dBm | -18.9dBm | -19.43dBm | ||
| 15dB | -20.20dBm | -20.36dBm | -19.70dBm | -20.04dBm | ||
| 18dB | -22.90dBm | -23.77dBm | -22.50dBm | -23.77dBm | ||
| 21dB | -23.8dBm | -24.20dBm | -23.60dBm | -24.56dBm | ||
| 25dB | -25.60dBm | -26.99dBm | -26.00dBm | -28.86dBm | ||
| 30dB | -31.10dBm | -40dBm | -33.00dBm | -40.00dBm |
Thanks for sharing this essential information about optical power meter. Your post is important to us.
ReplyDeleteI am interested in building this my self. Can you please specify me the components used in this project? Also if you have any schematics, can you please mail me ghadeerzarifa766@gmail.com
ReplyDeleteplease