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As fiber optic system becomes more and more common and has increasingly sophisticated, optical power measuring, the most basic actions for the fiber optic testing process, will also grow more and more complex. To make reliable measurements, people must consider the characteristics and interactions of optical power meter, fiber optic light source, detector types, attenuation, back
reflection, interference, and beam divergence.

Optical Power Meter Measurement

An optical power meter is used to measure the absolute optical power or the relative length of optical fiber optical power loss. Through the measurement of the absolute power of the transmitting end optical network, a power meter to be able to evaluate the performance of the light end equipment. The basic assumption for optical power measurement is the at the meter output reading is
directly proportional to the optical input power. This proportionality property is defined as linearity, and the departure from this direct proportionality is defined as nonlinearity.

Optical Light Source
Optical measurements can be made with a wide variety of light sources. Fiber optic light sources are designed to cover a variety of wavelength ranges to suit all optical testing needs, Light sources are offered in a variety of types including LED, halogen and laser. With the combination of a power meter and stabilized light source, it is possible to measure the connection loss, test continuity and help evaluate the transmission quality of fiber link. Optical Multimeter jor fiber optic multi meter integrates both an optical power meter module and an optical light source module and can perform closed-loop tests by using both modules, and can also work individually.

Optical metering system
Typical optical power measurement system consists of a detector and a display unit that calculates the optical power or energy represented by the electrical signal. The measurements are displayed or stored in convenient formats, such as analog or digital output, or entries in a data-collection file.
The optical detector, which converts an optical signal into an electrical signal, The most common types of optical-signal detectors are photodiodes, thermopiles, and pyroelectric detectors.
Photodiodes use the photon’s energy to create an electron-hole pair, Thermopile detectors are used for high-power laser sources, up to tens of kilowatts of optical power. Pyroelectric sensors are popular for pulsed laser sources. Among these detector types, photodiode sensors are the most widely used.

Light source back inflection
Accurately measuring a modulated or a pulsed light is very difficult as well as the CW (Light source back inflection) light source. When making peak-to-peak measurements, since waveforms can be greatly distorted. Rather tan reading directly from the detector. It is better to record the raw data, and than process it with digital filtering or statistical averaging with the fact of the limitations of the detector’s response time, and the speed of the meter’s circuitry.

To sum up, optical power measurement involved in the application of optical power meter, a stable fiber optic light source as well as the good understanding of the optical setup, the choice of detector types, detector saturation and noise, attenuation.

Fiberstore supplies a variety of cctv tests. Our range of quality CCTV Multifunction Testers are a must for every CCTV installer. They are cheap and enable you to set up and test your CCTV installations easily. CCTV testers minimize your commissioning cost and increasing your competitiveness. It’s an excellent helper and partner for the installer in project case.

Fiberstore stocks seven different models of hand-held test monitors, which are ideal devices for installers and field technicians to test video, PTZ functions, and status of UTP cables conveniently and efficiently.

Major Features of CCTV Tester:

LCD Video Monitor PAL or NTSC;

Video Signal Generator;

PTZ Controller for Camera;

PTZ Protocol Tester;

Cat 5 Cable Tester;

Rechargeable Batteries with Charger;

Additional Features (P/N E9010T Only);

IRE Signal Voltage Measurement;

Sunshade/Screen Protector;

7 Color Bar Video Signal Generator;

Multimeter function ( Volts AC, Volts DC and Resistance);

12VDC out for powering camera to make testing easier.

The STest-894 cctv camera tester with multimeter is developed for the On-Site installation and maintenance of video monitoring system. It can be used for displaying video, controlling PTZ, DC12V1A power for camera, Audio input test, generating images, capturing data of RS485 and testing LAN cable etc. Its functions, easy operation, and portability makes it simple for the CCTV technician to install and maintain CCTV system, improving work efficiency and get the labor cost down.

Another featured product in this line is the 7 Inch Industrial Panel PC with WinCE 5.0 featuring standard communication interfaces including Gigabit Ethernet and isolated RS232/RS485 serial ports, which can connect to industrial automation PLC, DCS, SCADA and PAC systems for production and factory automation applications. This family also includes 9 Channel Real Time Color Video Multiplexer which can be widely used in security monitoring, highway monitoring, toll station video surveillance system, industrial closed circuit television surveillance and high quality video conferencing and 4 Channel Color Video Quad Processor which provides high-quality split screen output for real-time multiple video channel display, live monitoring or recording purpose.

CCTV Tester PRO is developed for the installation and maintenance of video monitoring system. It can be used for displaying video, controlling PTZ, generating images, capturing data of RS485 and testing LAN cable etc. Its functions, easy operation, and convenient portability enable it simple for the contractor to install and maintain the video camera, promote working efficiency and cost-down the expenditure of the project.

CCTV Tester Application:

CCTV system installation and maintenance;

All in one camera testing;

The CCTV transmitting channel testing;

PTZ controller;

Lan cable testing.

Fiberstore is a global leader in research, development and manufacturing of high performance telecommunication fiber testers and fiber tools.

In the fiber optic network systems, that is the true that the power level of an optical signal, either in free space or in an optical fiber are not always the same. For example, for fiber optic receivers, too much light can overload it and degrade the bit error ratio. In order to achieve the best bit error ratio, the light power must be reduced, this time an optical attenuator is need to balance the power of the light by reducing the higher power and fit for the fluent signal transmissions between different devices.

The working principle of the fiber optic attenuator can be compared to a sunglass, which absorbs the extra light energy and protect you eyes from being dazzled. Attenuators typically have a working wavelength range (usually from 1310 to 1550nm) in which they absorb the light energy equally. An important characteristic of a good fiber attenuator is that they should not reflect the light instead, they should absorb the extra light without being damaged. Since the light power used in fiber optic communications are fairly low, they usually can be absorbed without noticeable damage to the attenuator itself.

Fiber optic attenuators are used for reducing the power of the light in the fiber optic network. two types fiber optic attenuators, fixed value fiber optic attenuator refer to the attenuator that can reduce the power of fiber light at a fixed value loss, for example, 2dB. Their applications include telecommunication networks, optical fiber test facility, LAN and CATV systems. Fixed value fiber optic attenuators are composed of four groups: Fixed-Plug in type, fixed adapter Type attenuator, fixed In-line type attenuator, and Fixed Hybrid Adapter type. While adjustable fiber optic attenuator refer to the attenuator that can generate an adjustable Loss to the fiber optic link, they are general used for testing and measurement, but they also have a wide usage in EDFA for equalizing the light power among different channels. Variable Fiber optic attenuators are composed of three groups: Variable plug-in type, Variable adapter type, Variable In-line type and Manual VOA type.

The attenuators can be female to female which is called bulkhead fiber optic attenuator or male to female which is also called a plug fiber optic attenuator. Bulkhead and plug types are designed without cables; another type inline fiber optic attenuator is designed with a piece of fiber optic cable.Wide range variable & inline fiber optic attenuators .the inline fiber optic attenuators are with more accurate attenuation compared with traditional connector type fiber optic attenuators. Variable in-line Optical attenuators are often used with an optical power meter in the optic amplifier systems to balance the gain across the different operating wavelengths.

A wide range of fiber optic attenuators are supplied at ingellen.com which includes LC, SC, and ST, FC, MU, E2000, Fixed Adaptor Type Attenuators, Fixed In Line Type Attenuators, Variable Attenuator Instrument and Variable attenuators. Our fiber optic attenuators are manufactured according to international standard and are compartible with the fiber optic products currently available in the international market.

The optical attenuator is an essential component where optical signal levels need to be adjusted over a wide range of powers. To make the reliable measurements, one must consider the characteristics interactions of fiber optic light source.  Optical light sources are used with the fiber optic power meter to test the fiber system loss, which can offered in a variety of types including LED, halogen and laser. With the optical attenuator and optical power meter calibration system, the attenuation can be easily modified to any level required for telecom and CATV network.

A fiber media converter connects standard optical interfaces with electrical interfaces; links single mode fibers with multimode fiber cables; adapts dissimilar data rates; and converts different transmission protocols. It is a cost- effective solution for those who want to buy switches to use with fiber but they are too expensive, they can easily buy ordinary switches and use fiber media converters to achieve their fiber network.

Media converter types range from small standalone devices and PC card converters to high port-density chassis systems that offer many advanced features for network management. Options exist for many distances to suit the needs of a particular Ethernet to fiber application. And, fiber interface connectors can be dual ST, dual SC, dual LC or single SC type.

The most common type of Ethernet Fiber Converter is a standalone device (managed or unmanaged) with its own power adapter. They convert fixed speed Fast Ethernet, Gigabit or rate converting 10/100/1000 UTP links to 100Base-FX or 1000Base-X fiber connections. When large density media converters are required, chassis-based systems are also available. These rack mountable units can house up to 19 managed or unmanaged media converter modules providing redundant power for AC and 48v DC environments.

Fiber media converters support many different data communication protocols including Ethernet, Fast Ethernet, Gigabit Ethernet, T1/E1/J1, DS3/E3, as well as multiple cabling types such as coax, twisted pair, multi-mode and single-mode fiber optics. They are important in interconnecting fiber optic cabling-based systems with existing copper-based, structured cabling systems.

Fiber media converters can connect different local area network (LAN) media, modifying duplex and speed settings. Switching media converters can connect legacy 10BASE-T network segments to more recent 100BASE-TX or 100BASE-FX Fast Ethernet infrastructure. For example, existing half-duplex hubs can be connected to 100BASE-TX Fast Ethernet network segments over 100BASE-FX fiber.

When expanding the reach of the LAN to span multiple locations, media converters are useful in connecting multiple LANs to form one large campus area network that spans over a limited geographic area. As premises networks are primarily copper-based, media converters can extend the reach of the LAN over single-mode fiber up to 160 kilometers with 1550 nm optics.

On some devices, Simple Network Management Protocol (SNMP) enables proactive management of link status, monitoring chassis environmental statistics and sending traps to network managers in the event of a fiber break or even link loss on the copper port.

Other benefits of media conversion include providing a gradual migration path from copper to fiber. Fiber connections can reduce electromagnetic interference.

Fiber media converters are used in networking more and more often currently. Different from tranditional media converters, Fiber Media Converter is definitely an optical converter designed for the fiber optic area. The development of fiber optic media converter increases with a sharp in demand for network capacity, the type like Gigabit Ethernet Converter and complexity of optical media converter are developed at an alarming rate.