{"id":2342,"date":"2023-02-08T15:48:01","date_gmt":"2023-02-08T07:48:01","guid":{"rendered":"https:\/\/www.premlink.net\/?post_type=product&p=2342"},"modified":"2026-03-26T14:59:13","modified_gmt":"2026-03-26T06:59:13","slug":"emetteur-optique-a-modulation-externe","status":"publish","type":"product","link":"https:\/\/www.premlink.net\/fr\/product\/external-modulation-optical-transmitter\/","title":{"rendered":"PL1550G \u00c9metteur optique \u00e0 modulation externe 1550nm (Type Low Cost)"},"content":{"rendered":"

Product Overview<\/h2>\n

The 1550nm external modulation optical transmitter is designed primarily 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 bandwidth of 1550 nm and depend on 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

PL1550G External Modulation Optical Transmitter has a bandwidth of 47MHz to 1002MHz and uses an imported low-noise DFB laser with a high linear LiNbO3 external modulator. An excellent pre-distortion circuit ensures the best CTB and CSO when the CNR is of high level. PL1550G 1550nm External Modulation Optical Transmitter (Low Cost Type ) 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<\/a><\/td>\n<\/tr>\n
Output Port<\/td>\n\/<\/td>\n1\/2<\/td>\n<\/td>\n<\/tr>\n
Output Power per Port<\/td>\ndBm<\/td>\n7\/8\/9\/10<\/td>\n1dBm\/step, max 2*5dBm<\/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\u226552.0<\/td>\nTX to RX directly, Rx 0dBm, PAL-D\/59CH<\/td>\n<\/tr>\n
CNR2<\/sup><\/td>\ndB<\/td>\n\u226550.0<\/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

PL1550T 1550nm external modulation optical transmitter is made up of an external modulator, DFB laser, laser control circuit, optical modulator, modulation control circuit, microprocessor, pre-distortion circuit, photodetector, RF signal attenuator, amplifier, power supply, and other components.<\/p>\n

Welcome to enquiry our PL1550G 1550nm External Modulation Optical Transmitter<\/p>\n

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PL1550G: Cost Effective 1550nm External Modulation Optical Transmitter<\/h2>\n

The high-performance solution for long-haul HFC trunks and large-scale optical distribution, engineered to overcome fiber dispersion and non-linear distortion.<\/p>\n

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  • Advanced LiNbO3 External Modulation:<\/strong> This external modulation optical transmitter<\/strong> utilizes a high-linearity LiNbO3 (Lithium Niobate)<\/strong> modulator and imported low-noise DFB laser, enabling high-speed data and video transmission over 65km without chirp-induced distortion.<\/li>\n
  • Adjustable SBS Suppression:<\/strong> Features a sophisticated SBS (Stimulated Brillouin Scattering)<\/strong> control circuit, adjustable from 13dBm to 19dBm<\/strong> (0.1dBm steps), allowing for maximum optical power launch into long fiber spans and EDFAs.<\/li>\n
  • Precision Non-linearity Pre-distortion:<\/strong> Integrated with a proprietary pre-distortion circuit<\/strong>, the PL1550G maintains exceptional CTB and CSO (\u226565dB)<\/strong> levels even when operating at high CNR, ensuring broadcast-quality signal delivery.<\/li>\n
  • Dual-Mode OMI & AGC:<\/strong> Supports flexible OMI (Optical Modulation Index)<\/strong> adjustment and Automatic Gain Control (AGC) to maintain a stable modulation depth across varying RF input levels from 75 to 85 dB\u00b5V.<\/li>\n
  • Mission-Critical Reliability:<\/strong> Built with a 19″ 1U rack-mount housing featuring 1+1 hot-swappable dual power supplies<\/strong> and an intelligent temperature control system to guarantee 24\/7 network uptime.<\/li>\n<\/ul>\n<\/div>\n
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    Technical FAQ: External Modulation Optical Transmitter<\/h2>\n
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    Q1: Why is external modulation required for long-distance CATV links?<\/h3>\n

    A:<\/strong> Unlike direct modulation, an external modulation optical transmitter<\/strong> separates the laser source from the signal modulation process. This eliminates the “chirp” effect (frequency dither), which causes severe dispersion-related distortion over long fiber distances (typically >20km), making it the only choice for trunk line transmission.<\/p>\n<\/div>\n

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    Q2: What is the significance of the 13~19 dBm SBS adjustment?<\/h3>\n

    A:<\/strong> SBS limits the amount of optical power that can be launched into a fiber before causing massive noise. The PL1550G<\/strong> allows engineers to precisely tune the SBS threshold<\/strong> up to 19dBm, enabling the use of high-power EDFAs and extending the reach of the optical link without degrading the CNR (Carrier-to-Noise Ratio).<\/p>\n<\/div>\n

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    Q3: How can I manage the transmitter status remotely?<\/h3>\n

    A:<\/strong> The PL1550G is equipped with a standard RJ45 network interface supporting SNMP and WEB GUI<\/strong>. Operators can monitor laser bias current, cooling fan status, SBS levels, and RF power in real-time, receiving automated alerts for any parameters that fall outside of pre-set safety thresholds.<\/p>\n<\/div>\n<\/div>\n