Single-mode fiber optical attenuators
|
N7751A, N7752A, N7761A, N7762A, N7764A |
|
Connectivity |
FC/APC angled (Option -022) or
FC/PC straight (Option -021) contact connector interface |
|
Fiber type |
9/125 μm SMF 28 |
|
Wavelength range |
1260 nm to 1640 nm |
|
Attenuation range |
0 dB to 40 dB (45 dB typ.) |
|
Attenuation setting mode |
Power setting mode |
|
Range |
0 dB to 40 dB |
–50 dBm to +20 dBm |
|
Resolution |
0.01 dB |
0.01 dB |
|
Repeatability1 |
typ. ± 0.05 dB for attenuation 0 dB to 30 dB
typ. ± 0.10 dB for attenuation 30 dB to 40 dB |
± 0.025 dB |
|
Accuracy (uncertainty) 1 – 3 |
typ. ± 0.10 dB for attenuation 0 dB to 10 dB
typ. ± 0.15 dB for attenuation 10 dB to 20 dB
typ. ± 0.40 dB for attenuation 20 dB to 40 dB |
|
Relative accuracy (uncertainty) |
± 0.05 dB ± 300 pW |
|
Polarization dependent loss 5 |
typ. ≤ 0.15 dBPP for attenuation 0 dB to 10 dB
typ. ≤ 0.25 dBPP for attenuation 10 dB to 20 dB
typ. ≤ 0.5 dBPP for attenuation 20 dB to 40 dB |
≤ 0.15 dBPP 6 |
|
Settling time |
typ. 20 ms 7 |
typ. 100 ms 6 |
|
Insertion loss 8 |
typ. ≤ 1.2 dB (excluding connectors)
≤ 2.2 dB (including connectors) 9 |
|
Attenuation transition speed |
selectable from 0.1 to 1000 dB/s |
|
Relative uncertainty of monitor power meter 2, 10 |
± 0.05 dB ± 300 pW |
|
Averaging time of monitor power meter |
2 ms to 1 s |
|
Return loss |
typ. 45 dB |
|
Maximum safe input power |
+23 dBm if applied to input port; < +18 dBm if applied to output port |
|
Optical path blocking |
typ. 45 dB |
Optical power meter
|
N7751A and N7752A |
|
Sensor element |
InGaAs |
|
Wavelength range |
1260 nm to 1640 nm |
|
Specification wavelength range |
(1310 ± 15) nm, (1490 ± 10) nm, (1550 ± 15) nm |
|
Power range |
–80 dBm to +10 dBm |
|
Maximum safe power |
+16 dBm |
|
Averaging time |
2 ms to 1s |
|
Applicable fiber type |
Standard SM and MM ≤ 62.5 μm core size, NA ≤ 0.24 |
|
Uncertainty at reference conditions 1, 3 |
± 2.5% |
|
Total uncertainty 2, 5, 6 |
± 4.5% |
|
Linearity 7
at (23 ± 5)°C
over operating temperature |
± 0.02 dB
± 0.04 dB |
|
Polarization dependent responsivity (PDR) 3, 8 |
typ. < ± 0.01 dB (1260 nm to 1580 nm) |
|
Spectral ripple (due to interference) 10 |
typ. < ± 0.01 dB |
|
Drift (dark) 4 |
± 9 pW |
|
Noise pp (dark) 3, (1s averaging time, 300s observation time) |
< 7 pWpp |
|
Return loss 9 |
typ. > 57 dB |
