New Products Optical Fiber Identifiers with ONU Detecting Function FID-30R/31R During construction or maintenance service for Fiber to the Home (FTTH) networks, an optical fiber identifier is used. Low bending loss optical fiber such as G657 are becoming more common on FTTH networks and have durability against strong bending stress. Low bending loss optical fibers and standard optical fibers are used in FTTH networks therefore the optical fiber identifier is required to have the performance to detect the signals in any kind of these fibers. A function to detect the connection of an Optical Network Unit (ONU) at home or office is required in order to prevent miss-cutting of live fibers. To fulfill these requirements, two new optical fiber identifiers FID-30R/31R have been developed. The product specifications are shown in Table 2 and an image of the FID-30R is shown in Fig. 7. FID-30R : with Power Meter FID-31R : without Power Meter Features 1. Improvement of detecting sensitivity The detecting sensitivity for signals has been improved by the optimization of a digital filter that extracts a particular frequency signal from the light signal in optical fiber. It has also achieved -96dBm leaked light signal detecting performance on a photodetector in turn making the highest sensitivity optical identifier in the world. As the result, the minimum detectable signal intensity have been improved to -37dBm from -21dBm on G657 optical fiber. The new optical fiber identifiers will provide the ability to work with low signal intensity situation such as a place far from base station or after splitters. 2. Combination of five functions There were two types of previous equipment. One had four functions, optical fiber identification, live fiber identification, signal direction identification and power meter, the other an ONU signal detection function only. The new optical fiber identifier FID-30R is equipped with all these functions in one package and can meet various types of work. Additionally the new optical fiber identifiers can detect not only GE-PON but also B-PON signals. 3. Function 3.1 Universal Clamp The universal clamp is shown in Fig.1 and Fig.2. It can clamp from 0.25mm coated fiber to 3mm jacketed fiber without exchanging the clamp. 3.2 Trigger lock function The new trigger lock function is to reduce the strain on an operator who has to pull the trigger for long time. This function can be selected using the trigger lock switch (ref. Fig.4) on the back of the grip. 3.3 Improvement of visibility The new optical fiber identifiers are equipped with a color LCD and backlight for improved visibility (ref. Fig.5). An operator can confirm the measuring results with the LED lights at the side of equipment (ref. Fig.6) even if they are working in the narrow space such as closure and cannot see the LCD screen. 3.4 Constant pressure retaining function The new optical fiber identifiers have a structure to keep constant pressure on the optical fiber in order to provide stable low insertion loss. Table 1. Comparison of detecting performance. Fujikura Technical Review, 2015 Items New model Conventional model Insertion loss (G.657) Less than 0.01 dB Less than 0.01 dB Detectable power (G.657) -37 dBm -21 dBm 51 3.5 Battery life Long time operation approximately 8 hours with two AA batteries has been achieved by a power saving design. 3.6 Firmware upgrade function Fujikura plans to develop firmware to adapt to various ONU signals. The new optical identifiers have a USB port to communicate with a PC. Customers can upgrade the firmware through our web site. New Products Optical Fiber Identifiers with ONU Detecting Function FID-30R/31R Fig. 1. 0.25 mm coated fiber in clamp. Fig. 2. 3mm jacketed fiber in clamp. Enable Disable Trigger lock switch 52 Fig. 3. Clamping with trigger lock. Fig. 4. Trigger lock switch. Fig. 5. Measurement result. Fig. 6. Identification work in splice closure. New Products Optical Fiber Identifiers Fig. 7. Appearance of new optical fiber identifier with ONU detecting function. with ONU Detecting Function FID-30R/31R Table 2. Specifications. Items Specifications Identification Fiber Type 0.25 /0.5mm coated fiber 2 to 12 ribbon fiber 1.1 to 3.0 mm jacketed fiber Detectable light Signal 270Hz / 1kHz / 2kHz modulated light CW or Traffic light Detectable Range 0 to -96 dBm 0 to -82 dBm Detectable light Signal 270Hz / 1kHz / 2kHz modulated light CW or Traffic light Detectable Range +10 to -60 dBm +10 to -40 dBm Power Meter Wavelength 1310 nm /1490 nm /1550 nm ONU signal Detection ONU detector Operating Range GE-PON Upper stream -7.5 GE-PON Down stream -25.5 to +6.2 dBm to +9.0 dBm Video signal Down stream -12.0 to +3.3 dBm B-PON Upper stream -5.5 B-PON Down stream -20.6 to +12.2 dBm to +4.0 dBm [Information] Engineering Department Precision Equipment Division Tel : +81 3 5606 1636 E-mail : [email protected] Fujikura Technical Review, 2015 53