1. Overview
The PD12 is a high-performance fiber-coupled amplified photodetector integrated with amplification circuitry, specially designed for FC-connected fiber optic cable systems. Encapsulated in a durable aluminum housing, it consists of a high-sensitivity photodiode, transimpedance amplifier and RF connector, with a standard FC fiber input flange for easy coupling and an SMA female output for optimized frequency response (up to 1GHz). Available in two spectral ranges (400-1000nm Si / 1000-1700nm InGaAs) and multiple bandwidth options, it supports 4/8/16 channel customization for diverse optical detection scenarios.
2. Features
- 400-1700nm Broad Spectral Range : Dual material options (Si/InGaAs) for visible to near-infrared light detection
- kHz-1GHz Ultra-Wide Bandwidth : Multiple bandwidth models (50kHz to 1GHz) to match different detection speed requirements
- Standard Fiber Optic Interface : FC/APC optical input + SMA female electrical output, 50Ω impedance for easy system integration
- Dual Fiber Compatibility : Works with single-mode (SM) and multimode (MM) fibers, flexible for various optical systems
- Customizable Channel Design : Supports 4/8/16 channel customization for multi-path signal detection
- High Sensitivity & Low Noise : Optimized transimpedance amplifier, ideal for ultra-weak light signal capture
- Compact Durable Design : Aluminum housing, low power consumption (9-12V DC), suitable for embedded/portable equipment
- Stable Industrial Performance : Wide operating temperature range, consistent output for long-term use
3. Applications
- Ultra-weak optical signal detection and acquisition
- Fast laser pulse signal detection
- Abnormal laser beat frequency signal detection
- Distributed fiber optic sensing (DVS/DAS) systems
- Optical communication signal reception
- Scientific research & laboratory optical detection experiments
- Industrial optical sensing and non-contact detection equipment
4. Specifications
| Items | PD12A-50k | PD12A-300k | PD12A-700k |
|---|
| Materials | Si |
| Wavelength | 400-1000nm |
| Photosensitive diameter | 200um |
| Responsivity | 0.5A/W @850nm |
| Bandwidth | DC-50kHz | DC-300kHz | DC-700kHz |
| Rise time | 7us | 1us | 0.5us |
| Gain(a) | 0.5x106V/W | 1.0x105V/W | 2.6x104V/W |
| Saturated Optical power | -20.4dBm (9.1uw) | -13.4dBm (45.5uw) | -7.5dBm (0.18mw) |
| Output bias voltage(a) | 10mV | 10mV | 10mV |
| Noise voltage(a) | 4mV | 3mV | 2mV |
| NEP | 2.46pW/√Hz | 4.98pW/√Hz | 11.1pW/√Hz |
| Maximum output amplitude(a) | 5V | 5V | 5V |
| Items | PD12A-10M | PD12A-50M | PD12A-200M | PD12A-400M |
|---|
| Materials | Si |
| Wavelength | 400-1000nm |
| Photosensitive diameter | 200um |
| Responsivity | 0.5A/W @850nm |
| Bandwidth(b) | DC-10MHz | DC-50MHz | DC-200MHz | DC-400MHz |
| Rise time(b) | 40ns | 8ns | 2ns | 1ns |
| Gain(a) | 1.35x105V/W | 2.7x104V/W | 1.2x104V/W | 5.4x103V/W |
| Saturated Optical power | 23.7uW | 118uW | 268uW | 592uW |
| Noise voltage(b) | 18mV | 18mV | 18mV | 18mV |
| NEP | 5.2pW/√Hz | 11.4pW/√Hz | 28pW/√Hz | 80pW/√Hz |
| Maximum output amplitude(a) | 3.2V | 3.2V | 3.2V | 3.2V |
| Items | PD12A-500M | PD12A-1G |
|---|
| Materials | Si |
| Wavelength | 400-1000nm |
| Photosensitive diameter | 200um |
| Responsivity | 0.5A/W @850nm |
| Bandwidth | DC-500MHz | DC-1GHz |
| Rise time | 800ps | 400ps |
| Gain(a) | 600V/W | 340V/W |
| Saturated Optical power | 6.1dBm (4.1mw) | 7dBm (5mw) |
| Noise voltage(a) | 5mV | 5mV |
| NEP | 100.3pW/√Hz | 156.6pW/√Hz |
| Maximum output amplitude(a) | 2.5V | 1.7V |
| Items | PD12C-50k | PD12C-300k | PD12C-700k |
|---|
| Materials | InGaAs |
| Wavelength | 1000-1700nm |
| Photosensitive diameter | 70um |
| Responsivity | 0.9A/W @1550nm |
| Bandwidth | DC-50kHz | DC-300kHz | DC-700kHz |
| Rise time | 7us | 1us | 0.5us |
| Gaina | 0.9x106V/W | 1.8x105V/W | 4.6x104V/W |
| Saturated Optical power | -23.8dBm (4.2uw) | -15.6dBm (27.8uw) | -6dBm (0.25mw) |
| Output bias voltage(a) | 10mV | 10mV | 10mV |
| Noise voltage(a) | 4mV | 3mV | 2mV |
| NEP | 1.25pW/√Hz | 2.46pW/√Hz | 6.24pW/√Hz |
| Maximum output amplitude(a) | 5V | 5V | 5V |
| Items | PD12C-10M | PD12C-50M | PD12C-200M | PD12C-400M |
|---|
| Materials | InGaAs |
| Wavelength | 1000-1700nm |
| Photosensitive diameter | 70um |
| Responsivity | 0.9A/W @1550nm |
| Bandwidth(b) | DC-10MHz | DC-50MHz | DC-200MHz | DC-400MHz |
| Rise time(b) | 40ns | 8ns | 2ns | 1ns |
| Gain(a) | 2.5x105V/W | 4.9x104V/W | 2.0x104V/W | 8.7x103V/W |
| Saturated Optical power | 12.8uW | 65uW | 160uW | 368uW |
| Noise voltage(b) | 18mV | 18mV | 18mV | 18mV |
| NEP | 2.2pW/√Hz | 5.6pW/√Hz | 18.4pW/√Hz | 39.9pW/√Hz |
| Maximum output amplitude(a) | 3.2V | 3.2V | 3.2V | 3.2V |
| Items | PD12C-100M
| PD12C-500M | PD12C-1G |
|---|
| Materials | InGaAs
| InGaAs |
| Wavelength | 1000-1700nm
| 1000-1700nm |
| Photosensitive diameter | 70um
| 70um |
| Responsivity | 0.9A/W @1550nm
| 0.9A/W @1550nm |
| Bandwidth | DC-100M
| DC-500MHz | DC-1GHz |
| Rise time | 3.5ns
| 800ps | 400ps |
| Gain(a) | 4.2x10^4V/W
| 1.1x10^3V/W | 610V/W |
| Saturated Optical power | 76uW
| 3.6dBm (2.3mw) | 6.1dBm (4.1mw) |
| Noise voltage(b) | 25mV
| 4mV | 4mV |
| NEP |
| 41.7pW/√Hz | 85.6pW/√Hz |
| Maximum output amplitude(a) | 3.2V
| 2.5V | 2.5V |
| Items | Detector Common Parameters |
|---|
| Operating voltage | 9-12V |
| Operating Current | <200mA |
| Output Impedance | 50Ω |
| Output coupling mode | DC |
| Output connector | SMA female |
| Operating temperature | -20~65℃ |
| Storage temperature | -40~85℃ |
Remarks:
a For high resistance loads
b For 50Ω loads
5. Response curve


6. Mechanical dimensions

7. Shipping list
| Item | Name of material | num | unit | note |
|---|
| 1 | photodetector | 1 | pcs | |
| 2 | power adapter | 1 | pcs | 12V |
| 3 | SMA to BNC RF Cable | 1 | pcs | |