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OPMs typically report the power either on a watts scale covering picowatts to milliwatts, or in decibel-milliwatts (dBm), which is the logarithmic ratio of the measured power to the reference value of one milliwatt.

OPMs come in various form factors. The optical sensor is either part of an internal detector circuit or housed in an external optical head for flexible positioning.

In this guide, you got an overview of optical power meters and their internals. Today's fastest petabyte-scale data networks wouldn't be possible without optical fibers. Photonics is revolutionizing other sectors as well, from avionics to health care, from quantum photonics to AI/ML.

The 8162xCand 8162xB families offer a variety of optical heads for flexible positioning and interchangeable connectivity with the N774xC meters.

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Such high-speed connections are needed for a variety of connections, from backplane interconnects to the connections between processors and accelerators like graphical processing units (GPUs) and field-programmable gate arrays (FPGAs). These accelerators are used for a variety of modern tasks like artificial intelligence inference and high-frequency trading.

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Modern high-speed networks run on optical fiber because of its incredible speed and virtually unlimited capacity. Optical power meters are a key element in the optimization and maintenance of such optical networks and of their components.

Whatever industry you're in, Keysight is your reliable test and measurement vendor. We also provide expert-level, accredited calibration services for your optical power meters of any brand.

The sensor is the most critical component. It converts the incident light energy into an electrical signal. Different types of sensors are available depending on their working principles as described below.

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Modern telecommunication core networks, both wired and wireless, are optical fiber networks because of their superb speed and capacity. Even the undersea cables connecting continents are part of the optical network.

An optical power meter (OPM) measures the power levels of light signals in devices that transmit data or power using light.

At Keysight, we offer you a wide range of standalone as well as modular optical power meters and related test equipment for optical power measurement applications. Let's look at some of our key products.

An OTDR contains an optical power meter as an internal component for testing power between two points. A typical OTDR schematic is shown below.

An OTDR is an advanced fiber optic tester that can measure optical loss between any two points in a fiber or optical assembly. You can use it to detect fiber breakages, loose connections, faulty or dirty connectors or couplers, and other problems as shown in this OTDR trace of power in decibels (dB) against distance.

Optical power meters can measure the power of both single-mode and multimode fibers. In single-mode fiber, the rays travel down its entire length without any internal reflection at all. In multimode fiber, multiple rays enter at different angles and possibly have different wavelengths as well.

Avionics and defense systems rely on optical fiber for speed and bandwidth. The high level of reliability and redundancy in these systems requires heavy use of OPMs for testing and maintenance.

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Modern data centers and cloud computing services require 400G, 800G, and even 1.6T ethernet to keep up with the bandwidth demands of their exponentially growing customer base.

For the characterization of fiber optic components, an OPM is combined with a light source, typically a laser with a wavelength equivalent to the use case of the component under test.

Additionally, engineers must ensure that all these techniques conform to tight power loss budgets and signal-to-noise tolerances using high-precision test and measurement devices like optical power meters, tunable laser sources, polarization synthesizers, and optical time domain reflectometers.

Closely related are the sensor's and meter's spectral responsivity curve, which shows the responsivity of the sensor at each wavelength. Responsivity is the ratio of the generated current or voltage at the sensor per watt of incident optical power. The spectral responsivity curve tells you the wavelength range where the sensor and meter show linearity, i.e., their reading is linearly proportional to the actual input energy.

Additionally, the total uncertainty is determined by other factors, including sensor uniformity, active area of the sensor, linearity, and temperature. Accounting for them, uncertainty can go as high as 5%-6%.

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An optical loss test set (OLTS) compares power levels with and without a fiber link to determine the link's net power loss. The fiber link may be a simple fiber or an assembly of fibers, splices, fusion splicers, connectors, attenuators, and other optical devices.

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A typical OPM is calibrated to be linear in the 10 dBm (10 milliwatt) to -50 dBm (10 nanowatt) range. In this range, a change in the actual power results in a linearly proportional change in the measured power.

You can use an OPM independently to measure the power level of a fiber optic signal. It essentially measures the instantaneous total energy of all the photons coming out of a fiber optic cable.

However, OPMs may also be displayless, or modular platforms meant for high-throughout measurements of multiple fibers or multiple ports. They just collect and stream the data from all channels to an attached computer.

Typical bench-top and handheld optical power meters support one or two detectors or optical heads. High-end multi-port meters support up to eight or more detectors or optical heads. Some rack-mounted meters support hundreds of ports.

Thermopile sensors absorb light and heat up to generate a temperature difference between two thermocouple surfaces. This temperature difference between two dissimilar metals generates a proportional voltage.

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The Lightwave Solution Platform offers expandable optical mainframes like the 8164B that accept specialized modules like sensors and loss detectors.

The term "optical power meter" may sound generic, but in popular usage, it specifically implies a fiber optic power meter. For light power measurements outside the field of fiber optics, alternative terms like light meter, laser power meter, and photometer are more common.

For simple everyday testing of cables, OTDR is often used along with a Visual Fault Locator (VFL). The OTDR measures the distance to problem points while the VFL enables visual checking and verification.

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In contrast, an optical head is a detector available as a separate external attachment for flexible positioning. You can easily detach an optical head and replace it with another better suited to the light source or fiber being tested.

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High-sensitivity meters may range from as low as -110 dBm to as high as +30 dBm but typically only for single-mode fiber testing.

To test its net loss, connect a suitable OLS to one end of the link and the power meter to the other end. Set the meter to the same wavelength as the OLS and measure the power.

A detector houses the sensor and its related filtering and processing circuitry. It's typically an internal component of the OPM.

In many markets, even the last-mile broadband access networks use technologies like fiber-to-the-home (FTTH) and fiber-to-the-X (FTTX) for high-speed internet. Fiber is even replacing ethernet inside our homes and offices around the world.

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A sensor amplifier circuit boosts the electrical signal from the sensor for reliable detection and measurement. Since sensor response is very sensitive to the input signal's wavelength, the amplifier should be carefully calibrated to boost the signal to a level based on the wavelength.

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A light source is an instrument that emits light signals with different characteristics like wavelengths, power levels, or timings. The light is emitted by light-emitting diodes (LEDs) or lasers. A light source can be of many types depending on the characteristics of its light emissions and testing purpose:

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You typically combine OPMs with other fiber optic test instruments, but they are sometimes used independently as well. We review both types of applications below.

All these fiber networks use optical power meters and related instruments for their testing. For example, last-mile passive optical networks (PONs) are tested using special handheld optical power meters called PON power meters.

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Dynamic range is the ratio of the highest power to the lowest power. A high dynamic range enables many applications. For example, if there is a problem like a connector fault or a break in the cable, it can cause the optical power to drop very low. An OTDR with a high-dynamic range OPM can detect and troubleshoot these problems.

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