LBTEK-Your Trusted Partner For Optoelectronic Experiments!

Product Description

Operating wavelength coverage: 190-2600 nm
Free-space input / Fiber input
Fixed gain and adjustable gain options
Output with monitoring port

LBTEK Balanced Photodetector consists of two well-matched photodiodes and an ultra-low noise, high-speed transimpedance amplifier, which generates an output voltage (RF OUT) proportional to the difference in photocurrent between the two photodiodes. Monitor+ and Monitor- are the DC monitoring ports for the two photodiodes, allowing monitoring of the DC level of the input signals. The detector's optical input interfaces are available in two types: FC/APC fiber optic interface and free-space. The electrical signal is output via an SMA port. It features high gain, high sensitivity, high bandwidth, low noise, and high common-mode rejection ratio, effectively reducing common-mode noise from the input light and improving the system's signal-to-noise ratio. It comes in two gain types: fixed gain and adjustable gain. The fiber optic version offers both DC-coupled and AC-coupled variants to suit different application scenarios. It is primarily used in fields such as nanosecond optical pulse detection, LiDAR, fiber optic coherence tomography, and fiber optic sensing systems.

Fiber-optic balanced photodetector, fixed gain

Operating Wavelength: 320-1000 nm; 800-1700 nm
FC/APC Fiber Input
Fixed Gain
With High-Speed Monitor Output

LBTEK's fiber-optic balanced photodetector series covers silicon and indium gallium arsenide types, providing FC/APC fiber input interfaces and featuring three SMA electrical connection output ports (RF OUT, MONITOR+, MONITOR-). It offers two output coupling methods: DC coupling and AC coupling, to adapt to different application scenarios. AC coupling blocks the continuous wave component (i.e., the unmodulated part) of the optical input signal. Therefore, if it is necessary to measure a relatively weak frequency-modulated signal that is under a strong continuous wave background signal, an AC-coupled detector can be selected. The detector housing has an M4 threaded mounting hole on the side, suitable for universal installation. Each balanced photodetector comes with a ±12V linear power supply.

Input and Output Interfaces

Product Model	Operating Wavelength	bandwidth	NEP (Noise Equivalent Power)	Output coupling method	Unit Price	Lead Time
PDB100A-DC New	320~1000 nm	DC~100 MHz	12.03 pW/√Hz	DC coupling	$980.56	3 weeks
PDB100A-AC New	320~1000 nm	100 Hz~100 MHz	12.03 pW/√Hz	AC coupling	$980.56	3 weeks
PDB200A-DC New	320~1000 nm	DC~200 MHz	22.86 pW/√Hz	DC coupling	$1045.93	3 weeks
PDB200A-AC New	320~1000 nm	100 Hz~200 MHz	22.86 pW/√Hz	AC coupling	$1045.93	3 weeks
PDB400A-DC New	320~1000 nm	DC~400 MHz	9 pW/√Hz	DC coupling	$1176.67	3 weeks
PDB400A-AC New	320~1000 nm	100 Hz~400 MHz	9 pW/√Hz	AC coupling	$1176.67	3 weeks
PDB800A-AC New	320~1000 nm	30 kHz~800 MHz	22 pW/√Hz	AC coupling	$1699.64	3 weeks
PDB100C-DC New	800~1700 nm	DC~100 MHz	6.99 pW/√Hz	DC coupling	$980.56	3 weeks
PDB100C-AC New	800~1700 nm	100 Hz~100 MHz	6.99 pW/√Hz	AC coupling	$980.56	3 weeks
PDB200C-DC New	800~1700 nm	DC~200 MHz	8.52 pW/√Hz	DC coupling	$1045.93	3 weeks
PDB400C-DC New	800~1700 nm	DC~400 MHz	4.5 pW/√Hz	DC coupling	$1176.67	3 weeks
PDB200C-AC New	800~1700 nm	100 Hz~200 MHz	8.52 pW/√Hz	AC coupling	$1045.93	3 weeks
PDB400C-AC New	800~1700 nm	100 Hz~400 MHz	4.5 pW/√Hz	AC coupling	$1176.67	3 weeks
PDB1000C-AC New	800~1700 nm	30 kHz~1000 MHz	9 pW/√Hz	AC coupling	$1699.64	3 weeks
PDB1600C-AC New	800~1700 nm	30 kHz~1600 MHz	9.3 pW/√Hz	AC coupling	$1765.01	3 weeks

Fiber-optic balanced photodetector, adjustable gain

Operating Wavelength: 320-1000 nm; 800-1700 nm
FC/APC Fiber Input
5 Adjustable Gain Levels
With High-Speed Monitoring Output

LBTEK's fiber-optic balanced photodetector series covers both silicon and indium gallium arsenide types, with 5 adjustable gain levels to meet the needs of photodetection applications under different light intensity conditions. It provides an FC/APC fiber optic input interface and features 3 SMA electrical connection output ports (RF OUT, MONITOR+, MONITOR-). Two output coupling methods, DC coupling and AC coupling, are offered to adapt to different application scenarios. AC coupling blocks the continuous wave component (i.e., the unmodulated part) of the optical input signal. Therefore, if it is necessary to measure relatively weak modulated signals that are under a strong continuous wave background signal, an AC-coupled detector can be selected. The detector housing has an M4 threaded mounting hole on the side, suitable for universal installation. Each balanced photodetector comes with a ±12V linear power supply.

Input and Output Interfaces

Product Model	Operating Wavelength	Output coupling method	Unit Price	Lead Time
PDBA100A-DC New	320~1000 nm	DC coupling	$1438.15	3 weeks
PDBA100C-DC New	800~1700 nm	DC coupling	$1568.89	3 weeks
PDBA100A-AC New	320~1000 nm	AC coupling	$1438.15	3 weeks
PDBA100C-AC New	800~1700 nm	AC coupling	$1568.89	3 weeks

Free-space balanced photodetector, fixed gain

Working wavelength: 190-1100 nm; 320-1000 nm; 800-1700 nm
Free-space input
Fixed gain
With monitor output

LBTEK's free-space balanced photodetectors cover three types: UV-enhanced silicon, silicon, and indium gallium arsenide. They can directly receive free-space input optical signals,and feature three SMA electrical connection output ports (RF OUT, MONITOR+, MONITOR-). The detector housing has external SM1 threads and internal SM05 threads, along with 3×M4 threaded holes, facilitating installation onto mounting rods. Each detector comes with two SM1-8B adapters anda ±12 V linear power supply.

Diagram of the top and side surfaces of the detector

Product Model	Operating Wavelength	bandwidth	NEP (Noise Equivalent Power)	Output coupling method	Unit Price	Lead Time
PDBS1A2-DC New	190~1100 nm	DC~1MHz	3.6 pW/√Hz	DC coupling	$1045.93	3 weeks
PDBS1A-DC New	320~1000 nm	DC~1MHz	2.2 pW/√Hz	DC coupling	$980.56	3 weeks
PDBS100A-DC New	320~1000 nm	DC~100 MHz	12 pW/√Hz	DC coupling	$1176.67	3 weeks
PDBS1C-DC New	800~1700 nm	DC~1 MHz	12 pW/√Hz	DC coupling	$1699.64	3 weeks
PDBS100C-DC New	800~1700 nm	DC~100 MHz	6.5 pW/√Hz	DC coupling	$1634.26	3 weeks

Free-space balanced photodetector, adjustable gain

Operating Wavelength: 190~1100 nm; 320~1000 nm; 800~1700nm; 900~2600nm
Free Space Input
6 Levels of Adjustable Gain
With Monitoring Output

LBTEK's free-space balanced photodetectors cover four types: UV-enhanced silicon, silicon, InGaAs, and XInGaAs, with 6 adjustable gain levels to meet the requirements of photodetection applications under different light intensity conditions. They can directly receive free-space input optical signals,feature three SMA electrical output ports (RF OUT, MONITOR+, MONITOR-). The detector housing has SM1 external threads and SM05 internal threads, along with 3×M4 threaded holes for easy mounting onto posts. Each detector comes with two SM1-8B adapters anda ±12 V linear power supply.

Diagram of the top and side surfaces of the detector

Product Model	Operating Wavelength	bandwidth	Output coupling method	Unit Price	Lead Time
PDBAS1A2-DC New	190~1100 nm	DC~1MHz	DC coupling	$1111.3	3 weeks
PDBAS1A-DC New	320~1000 nm	DC~1MHz	DC coupling	$1045.93	3 weeks
PDBAS1C-DC New	800~1700 nm	DC~1MHz	DC coupling	$1765.01	3 weeks
PDBAS1D-DC New	900~2600 nm	DC~1MHz	DC coupling	$1961.12	3 weeks

Balanced Photodetector

Operating Wavelength: 400-1100nm, 800-1700 nm
Common Mode Rejection Ratio >25 dB
Adjustable Gain Model Adjustment Range: 0~31dB

LBTEK Balanced Photodetectors are available in two wavelength ranges: 400-1100 nm and 800-1700 nm. They come in two models: fixed gain and adjustable gain. The adjustable gain model has a tuning range of 0~31 dB (software adjustable). Two input types are available: FC/APC fiber input and free-space input.

For the AC-coupled adjustable gain model, the typical low-frequency cutoff is around 30 kHz. For the AC-coupled fixed gain model with a bandwidth of 500 MHz or less, the low-frequency cutoff is around a few hundred Hz. For models with bandwidths above 500 MHz, the low-frequency cutoff is 30 kHz. For custom cutoff frequency requirements, please contact technical support for details.

Input and Output Interfaces

Product Model	Operating Wavelength	bandwidth	Output coupling method	Unit Price	Lead Time
PDBA-350M-AB	400 nm-1100 nm	350 MHz	AC	$1297.74	today
PDBS-1.6G-BC	800 nm-1700 nm	1.6 GHz	AC	$1601.58	today
PDB-200M-BC	800 nm-1700 nm	200 MHz	AC	$1153.01	today
PDB-500M-AB	400 nm-1100 nm	500 MHz	AC	$1453.84	today

Si Ultra-low Noise Miniature Balanced photodetectors

Operating Wavelength: 320 nm-1000 nm
FC/APC Fiber Input
Common Mode Rejection Ratio ≥30 dB
Ultra-Low Noise

The LBTEK Si Ultra-low Noise Miniature Balanced Photodetector operates within a wavelength range of 320 nm to 1000 nm, with FC/APC fiber optic input, offering five selectable bandwidth options: 75 MHz, 100 MHz, 200 MHz, 400 MHz, and 500 MHz. Note: The standard product's output coupling method defaults to AC-coupled output. DC-coupled output is available upon request for customization.

Install adapter plate

	Product Model	Operating Wavelength	NEP (Noise Equivalent Power)	bandwidth	Output coupling method	Unit Price	Compare	Lead Time
	UPDB-75M-A	320 ~ 1000 nm	9 pW/√Hz	75 MHz	AC	$1043.31		today