12 • Characteristics NEW FOCUS, Inc.
Photodetector Specifications
* NEP is frequency dependent. See page 9 for more details.
Model #
1801 1811
Wavelength Range 300–1050 nm 900–1700 nm
Coupling DC or AC DC or AC
3-dB Bandwidth
(DC versions)
DC–125 MHz (typical) DC–125 MHz (typical)
3-dB Bandwidth
(AC versions)
25 kHz–125 MHz (typ.) 25 kHz–125 MHz (typ.)
DC Bias Monitor Bandwidth
(AC versions only)
DC–50 kHz (typical) DC–50 kHz (typical)
Risetime 3 ns (typical) 3 ns (typical)
Transimpedance Gain
(AC-coupled version)
40 V/mA (AC)
1 V/mA (DC)
40 V/mA (AC)
1 V/mA (DC)
Transimpedance Gain
(DC-coupled version)
40 V/mA 40 V/mA
Output Impedance 50
Ω
50
Ω
Minimum NEP*
3.3 pW
/
2.5 pW
/
CW Saturation Power 120 µW @ 950 nm 120 µW @ 950 nm
Maximum Pulse Power 5 mW 5 mW
Detector Material/Type Silicon/PIN InGaAs/PIN
Detector Diameter 0.8 mm 0.3 mm (FS)
0.1 mm (FC)
Power Requirements ±15 V DC; 250 mA ±15 V DC; 250 mA
Optical Input FC or free space (FS) FC or free space (FS)
RF Output SMA SMA
DC Bias Monitor output
(AC-coupled units only)
SMB SMB
Hz Hz
18X1 HS rcvr rev G.fm Page 12 Thursday, September 20, 2001 2:08 PM
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