Category: FAQs

HTF Dispersion Compensation Module  is used to compensate the accumulated dispersion in the single-mode fiber, and the dispersion coefficient is used to characterize the dispersion value. Regular SMF is around +16~17 ps/(nm*km) at 1550nm.   To properly manage this, the DCM is built using a special type of dispersion compensating fiber inside the module that has… Continue reading What is dispersion coefficient range?

Alien lambda (alien wavelength) is a technology in which an “alien wavelength” operator can be directly connected to the DWDM system from the client’s device to increase the throughput capacity of existing DWDM networks or launch an encryption service. Why we need Alien lambda? your transmission service volume suddenly grows, you need to build connections between… Continue reading What is Alien lambda in DWDM system?

With the application of long-distance systems becoming more and more extensive, HTF self-developed middle stage access (MSA) EDFA, middle stage access (MSA) EDFA can effectively solve the insertion loss caused by DCM and OADM, offset the DCM and OADM. The resulting insertion loss reduces the additional degradation of the system OSNR. Middle stage access (MSA) EDFA models… Continue reading What is Middle Stage Access EDFA Optical Amplifier?

Many model options serve all the traditional amplifier applications in an extended optical link:BA booster amplifier , LA in-line amplifier, and PA pre-amplifier. A BA booster amplifier operates at the transmission side of the link. It features high input power, high output power, and medium optical Gain . Boosters are designed to amplify aggregated optical… Continue reading What is BA LA PA in DWDM system?

1Q: We are testing a Cisco N540-24Q8L2DD-SYS with 3rd party QSFP-100G-ZR4-S modules. Apparently, the Cisco IOS XR doesn‘t support a QSFP-100G-ZR4-S yet, so these are coded as QSFP-100G-ELR4 to be recognized by the Cisco IOS. They appear to work fine at 80KM. Are your QSFP-100G-ZR4-S modules coded thise way? A: Our QSFP-100G-ZR4-S uses 100G ER4 codes and… Continue reading 6 frequently asked questions on QSFP-100G-ZR4-S

(1) Achieve 100G speeds up to 80km with low-cost QSFP28 without costly open-line systems. (2) Dramatically reduce the cost of your 100G connections with the first ZR4 on the market. (3) Revolutionize your backhaul and distribution of service network. (4) Compatible with the full catalog of OEM switches and routers. (5) Expert support standing by to spec,… Continue reading Why we need 100G QSFP28 ZR4 80KM?

1. Interface Rate Before selecting the rate of an optical module, you need to confirm the rate supported by the switch port, and then select the rate of the optical module based on the rate supported by the switch. The rates of optical modules can be FE(155M), GE(1.25G), 10GE, 25GE, 40GE, 100GE, or 400GE. In… Continue reading 8 Tips help you quickly buy SFP QSFP28 optical module

What would you do if your network capacity can not meet your requirement? Will you put more fibers or update your system? In fact, these two methods are not very recommendable. Why? As your fiber cabling infrastructure is limited for adding fibers and high cost is required for upgrading system, these two methods are unworkable… Continue reading Dual-Fiber or Single-Fiber CWDM Mux Demux for Higher Capacity Need?

As the development of 100G Ethernet becomes a trend, the demand for 100G optical modules is increasing, and today 100G optical modules represent a significant portion of the network construction cost. Three solutions have emerged in the 100G 80km DCI space, namely 100G coherent, 100G PAM4 DWDM and 100G QSFP28 ZR4. 100G QSFP28 ZR4 Introduction… Continue reading 100G QSFP28 ZR4, The best choice for 100G long haul Data Center Interconnection

Dense Wavelength Division Multiplexing(DWDM) systems are an important part of modern long-haul backbone networks and metropolitan networks. In long-haul transmission applications, fiber attenuation and dispersion are the main factors affecting optical signal transmission, so active devices such as Erbium Doped Fiber Amplifier (EDFA) and Dispersion Compensator (DCM) are commonly used in Dense Wavelength Division Multiplexing (DWDM)… Continue reading Do you know the EDFA and DCM in DWDM system