COAX products - Modulight

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Cable televisionHybrid Fibre Coax (HFC), that incorporates bothfiber optic transmission components and coppercoaxial transmission components is a way ofdelivering video, voice telephony, data, and otherinteractive services over coaxial and fiber opticcables.The HFC network (figure) consists of networkinterface units, fiber nodes, distribution center,and head-end office. The network allows installationof an optical fiber from the cable head-end toserve the distribution center and particular fibernode, in which the optical signal is converted toelectrical signals. The electrical signal is redistributedusing coaxial cable to the subscriber’spremises, where network interface units distributethe signal to different devices. Such network withreturn channel, offers the subscriber a cost-effectiveservice upon demand with high speed.In CATV, for which HFC was originally designed,the AM-modulated data is setting strict requirementsfor the network linearity and noise properties.This requirement on the other hand favoursthe fiber optic transmission path, but at the sametime places stringent requirements on the fiberoptic transmitter i.e. laser module linearity andnoise properties.The relative intensity noise (RIN) is playing a keyrole in Carrier-to-Noise (CNR) performance of thefiber optic link, especially in short transmissiondistances at 1310nm. The RIN of Modulight’spigtailed laser module series designed specificallyfor analogue applications is of the order of150dBc/Hz and 145dBc/Hz, for Distributed Feedbackand Fabry-Perot lasers, respectively.In addition, the analog video signal is also quitesensitive to nonlinearity in the form of intermodulationdistortion. The distortion spectrum containsmany discrete lines deteriorating sensitive analogsignals. Very tight linearity criteria are used indesigning the HFC systems and extra attentionis paid for the optical transmitter distortion, butalso for distortion of the RF cascade. Modulight’spigtailed laser module series designed specificallyfor analogue applications is characterized againstthe stringent intermodulation distortion requirementsof the CATV transmission networks.12
Value adding solutions to optical applicationsML-COAX-1310-FP-2G5-21310 nm 2.5 Gbps Coaxial Fiber Pigtailed FP LaserApplicationsFeatures• High speed optical fiber communication • Low threshold current• Short and intermediate reach• Narrow spectral linewidth• SONET OC-48 systems• Low voltage and differential resistance• SDH STM-16 systems• Un-cooled MQW active region laser diode• Reliable single transverse mode emission• Monitor photodiode at rear mirror• 4-pin coaxial package with SM pigtail• With and without optical isolatorCOAX productsElectro-Optical CharacteristicsParameter Symbol Min Typ Max Unit Test ConditionThreshold Current Ith - 11 18 mA 25°COperating Current Iop - 35 45 mA 25°C, Pf=3mW50 70 mA 85°C, Pf=3mWOptical Output Pf - 2 3 mW 25°C, Iop=Ith+26mAOperating Voltage Vop - 1.2 1.5 V 25°C, Iop=Ith+26mASlope Efficiency η 0.08 0.12 - W/A 25°CPeak Wavelength λ 1270 1310 1340 nm 0°C-85°C, Pf=3mWSpectral Width (RMS) λ - 0.85 2 nm 25°C, Pf=3mWTemperature shift or wavelenght λ/T - 0.46 - nm/K 0°C-85°C, Pf=3mWMonitor Current lm 0.4 0.8 mA 25°C, Pf=3mWMonitor Dark Current lmd - - 1100 nA VRPD=10VAbsolute Maximum RatingsParameter Symbol Limit Values UnitMin MaxOptical Output Pf 4 mWLD Reverse Voltage Vrld2 2 VPD Reverse Voltage Vrpd 10 VOperating Temperature Topr -20 85 °CStorage Temperature Tstg -40 85 °CSoldering Temperature Tsol 260 °C13
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