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DAS-BPD Balanced Photodetector Coherent Detection Applications

DAS-BPD series balanced photodetectors are specially tuned for distributed fiber optic sensing DAS system, which is very suitable for coherent detection applications.

Model：DAS-BPD

Tags： DAS-BPD Balanced Photodetector Coherent Detection Applications DAS DVS

Contact： face

Huang Email: Hqy@ybphotonics.com

WhatsApp： +8613427781756 Web | App

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Product Info

Introduction

The balanced photodetector contains two photodiodes and a low-noise transimpedance amplifier, in which the two photodiodes are matched to each other for excellent common mode rejection ratio

1. Overview

The balanced photodetector contains two photodiodes and a low-noise transimpedance amplifier, in which the two photodiodes are matched to each other for excellent common mode rejection ratio, and the detector removes the common mode noise by subtracting the two detected signals, so that small changes in the effective signal can be obtained from the interfering noise.

2. Features

Covers wavelength range 1000-1700nm
Compact housing
Excellent common mode rejection ratio
SMA output connector

3. Applications

OCT
DAS
Outlier Detection
Optical Delay Measurement

4. Specifications

Items	DAS-BPD-200M
Materials	InGaAs
Wavelength	1000-1700nm
Input connector	FC
Responsivity	0.9A/W @1550nm
Common mode rejection ratio	>20dB
Bandwidth (a)	DC-200MHz
Rise time (a)	2ns
Gain (b)	50kV/A
NEP (c)	2.6pW/√Hz
Maximum output amplitude（a）	±1.0V
Operating voltage	±12V
Operating Current	<200mA
Output Impedance	50Ω
Output coupling mode	AC
Output connector	SMA female
Operating temperature	-20~65℃
Storage temperature	-40~85℃

Remarks:
a For 50Ω loads
b For high resistance loads
c At 80MHz

5. Mechanical dimensions

6. Response curve

Oscilloscope screenshot in DAS application

FAQ

Q：Do you have an unboxing picture of the photodetector?

A：When you buy our photodetectors, we will deliver SMA to BNC RF cable, and power supply for free.
Q: What are the advantages of your photodetectors compared to Thorlabs?
A: We support custom development and we offer better prices.
Q: What is the lead time for photodetector modules?
A: Basically, we have more than 90% of detectors in stock, only a few models need 3 weeks lead time.
Q: Do you support the sale of those countries, and is the shipping included?
A: Our service is available worldwide, regardless of country or region. Shipping is included.
Q: Who are your typical customers?
A: More than 100 top universities and research institutes in China have chosen us and given us high evaluations, such as: Chinese Academy of Sciences, CEC, Tsinghua University, Peking University and other clients.