{"id":2233,"date":"2023-02-02T15:54:47","date_gmt":"2023-02-02T07:54:47","guid":{"rendered":"https:\/\/www.premlink.net\/?post_type=product&p=2233"},"modified":"2026-03-26T15:28:32","modified_gmt":"2026-03-26T07:28:32","slug":"%d0%be%d0%bf%d1%82%d0%b8%d1%87%d0%b5%d1%81%d0%ba%d0%b8%d0%b9-%d0%bf%d0%b5%d1%80%d0%b5%d0%b4%d0%b0%d1%82%d1%87%d0%b8%d0%ba-%d1%81-%d0%b2%d0%bd%d0%b5%d1%88%d0%bd%d0%b5%d0%b9-%d0%bc%d0%be%d0%b4%d1%83-2","status":"publish","type":"product","link":"https:\/\/www.premlink.net\/ru\/product\/externally-modulated-optical-transmitter\/","title":{"rendered":"PL1550T 1550 \u043d\u043c \u043e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u0447\u0438\u043a \u0441 \u0432\u043d\u0435\u0448\u043d\u0435\u0439 \u043c\u043e\u0434\u0443\u043b\u044f\u0446\u0438\u0435\u0439"},"content":{"rendered":"

Product Overview<\/h2>\n

The 1550nm externally modulated optical transmitter is designed exclusively for fiber optic communication. Its major function is to transform electrical signals into optical signals and transmit them across optical fiber. Externally modulated optical transmitters have a working wavelength of 1550 nm and employ external modulation technology, which means they use an external modulator to change the intensity or other properties of an optical signal in order to send an electrical signal. External modulation technology is more adaptable and efficient than direct modulation technology, making it suited for long-distance and high-speed data transfer.<\/p>\n

PL1550T Externally Modulated Optical Transmitter combines a high linear LiNbO3 external modulator with an imported low-noise DFB laser. When the CNR is high, the optimal CTB and CSO are guaranteed by an excellent pre-distortion circuit. PL1550T 1550nm Externally Modulated Optical Transmitter has excellent performance that is the ideal choice for long-distance transmission and large area covered local networks.<\/p>\n

Specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/b><\/strong><\/td>\nUnit<\/b><\/strong><\/td>\nValue<\/b><\/strong><\/td>\nRemark<\/b><\/strong><\/td>\n<\/tr>\n
Operating Wavelength<\/td>\nnm<\/td>\n1540~1563<\/td>\nCompatible with ITU wavelength<\/td>\n<\/tr>\n
Output Ports<\/td>\n\/<\/td>\n2<\/td>\n<\/td>\n<\/tr>\n
Output Power per Port<\/td>\ndBm<\/td>\n7\/8\/9\/10<\/td>\n1dBm\/step<\/td>\n<\/tr>\n
Laser Linewidth<\/td>\nMHz<\/td>\n0.35<\/td>\n<\/td>\n<\/tr>\n
SMSR<\/td>\ndB<\/td>\n45~50<\/td>\n<\/td>\n<\/tr>\n
RIN<\/td>\ndB\/Hz<\/td>\n-160<\/td>\nRIN\u00a0(20~1002MHz)<\/td>\n<\/tr>\n
Optical Return Loss<\/td>\ndB<\/td>\n50<\/td>\n<\/td>\n<\/tr>\n
Fiber Connector<\/td>\n\/<\/td>\nSC\/APC<\/td>\nFC\/APC, LC\/APC\u00a0optional<\/td>\n<\/tr>\n
Operating Bandwidth<\/td>\nMHz<\/td>\n47~1002<\/td>\n<\/td>\n<\/tr>\n
Input Level<\/td>\ndB\u03bcV<\/td>\n75~85<\/td>\nAGC<\/td>\n<\/tr>\n
Flatness<\/td>\ndB<\/td>\n\u00b10.75<\/td>\n47~1002MHz<\/td>\n<\/tr>\n
Return Loss<\/td>\ndB<\/td>\n16<\/td>\n<\/td>\n<\/tr>\n
Input Impedance<\/td>\n\u03a9<\/td>\n75<\/td>\n<\/td>\n<\/tr>\n
RF connector<\/td>\n\/<\/td>\nF\u00a0type<\/td>\n<\/td>\n<\/tr>\n
CNR1<\/sup><\/td>\ndB<\/td>\n\u226553.0<\/td>\nTX to RX directly, Rx 0dBm, PAL-D\/59CH<\/td>\n<\/tr>\n
CNR2<\/sup><\/td>\ndB<\/td>\n\u226551.0<\/td>\nFiber 65km,\u00a0Rx 0dBm,PAL-D\/59CH<\/td>\n<\/tr>\n
CTB<\/td>\ndB<\/td>\n\u226565<\/td>\n<\/td>\n<\/tr>\n
CSO<\/td>\ndB<\/td>\n\u226565<\/td>\n<\/td>\n<\/tr>\n
SBS Suppress<\/td>\ndBm<\/td>\n13~19<\/td>\n\u00a00.1dBm\/step<\/td>\n<\/tr>\n
Power Supply<\/td>\nVac<\/td>\n90~265<\/td>\n<\/td>\n<\/tr>\n
Vdc<\/td>\n-72~-36<\/td>\n<\/td>\n<\/tr>\n
Power Consumption<\/td>\nW<\/td>\n60<\/td>\nDual Power Supply, \u00a01+1 standby<\/td>\n<\/tr>\n
Operating Temperature<\/td>\n\u2103<\/td>\n-5~+65<\/td>\n<\/td>\n<\/tr>\n
Storage Temperature<\/td>\n\u2103<\/td>\n-40~+85<\/td>\n<\/td>\n<\/tr>\n
Operating Relative Humidity<\/td>\n%<\/td>\n5~95<\/td>\n<\/td>\n<\/tr>\n
Dimension<\/td>\nmm<\/td>\n440*483*44<\/td>\nD*W*H<\/td>\n<\/tr>\n
Weight<\/td>\nKg<\/td>\n7.4<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Welcome to enquiry our PL1550T 1550nm Externally Modulated Optical Transmitter<\/p>\n

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PL1550T: Premium 1550nm Externally Modulated Optical Transmitter for Trunk Lines<\/h2>\n

Engineered for high-fidelity, long-distance optical transmission, the PL1550T combines advanced LiNbO3 modulation with precise pre-distortion for superior CNR performance.<\/p>\n

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  • High-Linearity LiNbO3 Modulator:<\/strong> This externally modulated optical transmitter<\/strong> employs a world-class Lithium Niobate (LiNbO3)<\/strong> external modulator, eliminating laser chirp and ensuring crystal-clear signal delivery over 65km spans.<\/li>\n
  • Optimized SBS Control (13-19dBm):<\/strong> Features advanced Stimulated Brillouin Scattering (SBS)<\/strong> suppression, user-adjustable in 0.1dBm steps. This allows operators to maximize optical launch power into long-haul fiber without noise degradation.<\/li>\n
  • Exceptional Signal Metrics:<\/strong> Achieve a high CNR \u226553.0dB<\/strong> and excellent non-linearity specs (CTB\/CSO \u226565dB<\/strong>) thanks to the integrated high-performance pre-distortion circuit and low-noise DFB laser source.<\/li>\n
  • Intelligent Thermal Management:<\/strong> Designed for continuous headend operation with fully automatic temperature control and dual-fan cooling, extending the lifespan of critical optical components.<\/li>\n
  • Carrier-Grade Redundancy:<\/strong> Includes 1+1 hot-swappable dual power supplies<\/strong> (AC or DC) and comprehensive SNMP\/WEB management<\/strong> for real-time remote monitoring of all operational parameters.<\/li>\n<\/ul>\n<\/div>\n
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    Technical FAQ: Externally Modulated Optical Transmitter<\/h2>\n
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    Q1: What makes the PL1550T suitable for large-scale HFC local networks?<\/h3>\n

    A:<\/strong> The PL1550T externally modulated optical transmitter<\/strong> is designed to feed multiple high-power EDFAs. Its high CNR and adjustable OMI ensure that even after multiple stages of optical amplification and splitting, the end-of-line signal quality remains well within broadcast standards.<\/p>\n<\/div>\n

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    Q2: How does the SBS suppression impact long-distance fiber spans?<\/h3>\n

    A:<\/strong> In a 1550nm externally modulated transmitter<\/strong>, SBS can cause significant backscatter noise. By adjusting the SBS threshold up to 19dBm<\/strong>, the PL1550T allows you to push more light through the fiber, effectively increasing the reach of your trunk line without adding extra active nodes.<\/p>\n<\/div>\n

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    Q3: Can the OMI be fine-tuned for different network configurations?<\/h3>\n

    A:<\/strong> Yes. The PL1550T allows for precise OMI (Optical Modulation Index)<\/strong> adjustment. This flexibility is vital when balancing the RF input from various headend combiners to achieve the optimal trade-off between CNR and non-linear distortion (CSO\/CTB).<\/p>\n<\/div>\n<\/div>\n