InGaAs High Speed Photodetectors with AC Coupling

Single-Ended and Dual-Balanced

WL-BPD600MA InGaAs High Speed AC Photodetector

Wieserlabs offers high speed InGaAs photodetectors, in both single-ended and dual-balanced versions. All of them feature:

  • Low noise
  • AC coupling: DC light intensities are suppressed, standard cutoff frequency 300 kHz (customizable 30 kHz to 5 MHz)
  • InGaAs photodiodes with FC fiber coupling

Please note: AC coupling in the detectors suppresses the DC light intensity preventing amplifier saturation even at high input levels. Such detectors are useful whenever the AC signal is relevant and the DC offset can be suppressed, e.g. for pulse measurements, swept source optical coherence tomography (SS-OCT) and certain noise measurements. However, for CW intensity monitoring, DC rather than AC-coupled photodiodes must be used, e.g. the WL-DPD200MA.

Dual-Balanced (Differential) Photodetectors

Dual-Balanced (i.e. differential) detectors feature two complementary light inputs. They are particularly well suited for applications where complementary signals are available, e.g. at the output of an interferometer. The dual-balanced detector amplifies the difference of the incoming light intensities thereby suppressing common-mode noise. Furthermore, for complementary signals, gain is increased by 6 dB (factor 2 in output voltage) compared to single-ended detection.

All Wieserlabs dual-balanced detectors can be used as single-ended ones simply by utilizing only one of the two inputs.

PartDetector-3 dB BWGain 1550 nmCouplingDatasheet
WL-BPD220MAInGaAs 220 MHz 3500 V/WAC (300 kHz)  download
WL-BPD270MA5InGaAs 270 MHz3500 V/WAC (5 MHz)  download
WL-BPD600MAInGaAs 600 MHz3500 V/WAC (300 kHz)  download
WL-BPD1GAInGaAs 1 GHz3500 V/WAC (300 kHz)  download

Note: Other bandwidths and AC cutoff frequencies are available upon request. The trans-impedance gain can be increased up to 5000 V/Wopt..

Single-Ended Photodetectors

Single-ended photodetectors have one single light input. They are useful whenever fast light modulations have to be detected, e.g. for pulse monitoring, propagation time measurements, offset locks, etc. Due to their high trans-impedance gain and low noise, these diodes are also well-suited for certain intensity noise measurements.

PartDetector-3 dB BWGain 1550 nmCouplingDatasheet
WL-PD450MAInGaAs450 MHz3000 V/WAC (300 kHz)  download
WL-PD1GAInGaAs1 GHz3000 V/WAC (300 kHz)  download
WL-PD2GA*InGaAs 2 GHz3000 V/WAC (300 kHz)

* Coming soon.