818 Series FC/PC Fiber-Optic Photodiode Power Sensors

Compare	Model	Compatibility	rankScore		Spectral Range	Minimum Measurable Power	Availability	Price	Brand
818-UV-L-FC/DB Fiber Optic Detector, UV-Si, 200-1100 nm, 1.5 mW, DB15 $601 In Stock	818-UV-L-FC/DB Fiber Optic Detector, UV-Si, 200-1100 nm, 1.5 mW, DB15	UNIVERSAL	1.0	1.0	200 - 1100 nm	20 pW	In Stock	$601	Newport
818-SL-L-FC/DB Fiber Optic Detector, Si, 400-1100 nm, 4 mW, DB15 $487 In Stock	818-SL-L-FC/DB Fiber Optic Detector, Si, 400-1100 nm, 4 mW, DB15	UNIVERSAL	1.0	2.0	400 - 1100 nm	20 pW	In Stock	$487	Newport
818-IR-L-FC/DB Fiber Optic Detector, Ge, 780-1800 nm, 10 mW, DB15 $607 7 Weeks	818-IR-L-FC/DB Fiber Optic Detector, Ge, 780-1800 nm, 10 mW, DB15	UNIVERSAL	1.0	3.0	780 - 1800 nm	5 nW	7 Weeks	$607	Newport
818-IG-L-FC/DB Fiber Optic Detector, InGaAs, 800-1650 nm, 10 mW, DB15 $984 In Stock	818-IG-L-FC/DB Fiber Optic Detector, InGaAs, 800-1650 nm, 10 mW, DB15	UNIVERSAL	1.0	4.0	800 - 1650 nm	20 pW	In Stock	$984	Newport

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Features

Excellent Photodiode Linearity

These photodiodes show excellent linearity over a large dynamic range. This is ideal for use in applications that require high accuracy measurements down to the pW level, especially when combined with a high sensitivity power meter that can accommodate the large dynamic range of the optical signal.

Responsivity Variation over Temperature

A natural characteristic of a photodiode is for the its optical response to change as the temperature changes near the bandgap of semiconductor materials. Newport’s 918D series sensors feature a thermocouple near the photodiode, which allows certain Newport meters to read the temperature and automatically adjust the responsivity, ensuring the most accurate measurements.

Factors that Affect Maximum Measurable Power

The maximum measurable power of photodiode sensors is dependent on several factors such as the wavelength of incoming light, photodiode current output saturation, temperature, use of an attenuator and a power meter's maximum current input value. Newport provides maximum power specifications based on the power meter models, with and without an attenuator, and wavelength-dependent maximum power level. With these factors affecting measurable power in mind, choosing the proper detector for your application is critical.

Cost Effective Fiber-Optic Power Detection

These 818 Series fiber-optic photodiode optical power sensors are a low cost alternative to the 818-IS or 918D-IS Series sphere-based fiber-optic detectors. They are based on our standard 818 Series detectors with an included, removable 884-FC FC/PC fiber optic adapter. Replacing 884-FC with 884-FCA, 884-SMA, 884-E2000FC, and 884-ADAPT will accommodate for additional popular fiber optic connectors.

Free space measurements

The photodiode sensor in the 818-xx-L-FC/DB is calibrated in free space. The 884-FC fiber adapter has no impact on calibration. Therefore, free space measurements can be done simply by removing the fiber adapter.

NIST-traceable Sensor Calibration

Our calibrated photodiode sensors include a full spectral response calibration utilizing NIST-traceable standards calibrated with high-precision equipment maintained in Newport’s optical detector calibration facility. Tight calibration facility and process control allows the tightest calibration uncertainty in industry. Each detector is shipped with the calibration data, which is electronically stored inside the detector's EEPROM. A certificate of calibration as well as the actual calibration curves and data are shipped with each detector for attenuator and no attenuator models. To maintain accuracy and guarantee performance, Newport recommends annual photodiode detector calibration.

Detector calibration system block diagram.

Removable Calibration Module

The 818 series detectors include a BNC connector with a removable calibration module. The /DB suffix indicates a DB15-style calibration module that is directly compatible with Newport’s current power meters. Models with the /CM suffix, which include a legacy round 8-pin mini-DIN module and the BNC connector models, 818-xx, are no longer available. For older instruments that require no calibration module (BNC), we recommend that customers purchase 818-xx/DB and simply remove the DB15 calibration module. Please order the 818-SCAL-OPT when only a new calibration module is needed for the 818 Series photodiode detectors, without the need to recalibrate the detector.

Additional Functionality with BNC Connector

The BNC connector extends the functionality of the 818 Series photodiode sensors. It enables direct connection to an ammeter or lock-in amplifier. It also allows the detector output to be viewed on an oscilloscope after first connecting it to a current-to-voltage preamplifier, such as Newport's model 70710. Furthermore, the cable length can be extended by connecting another BNC cable.