Category: FAQs

Why do I need DCM in DWDM link? Dispersion is a fiber based physical effect that spreads the optical pulse while it travels down the optical fiber. This effcet worsens the signal quality and thus limits the maximum distance you can achieve with your optical system. In order to counter this efef ct, DCM (Dispersion Compensation Modules)… Continue reading Why do I need DCM in DWDM link?

Can we add add EDFA to the single fiber DWDM solution？   Yes, EDFA modules can be added to the single fiber solution, but they should be used with Red/Blue C Band Filter.    Since the EDFA can only amplify signals from one direction, in single fiber application, the Red/Blue C Band Filter should be… Continue reading Can we add add EDFA to the single fiber DWDM solution？

0G coherent optical modules are mainly used for line-side optical transmission in 100G wavelength division systems. Compared with other line-side optical modules, they have good OSNR performance, sensitivity, dispersion tolerance, and DGD tolerance. DWDM technology using coherent modules is widely used in 100G metropolitan area networks to meet high-capacity and long-haul requirements.   HTF will… Continue reading Why use 100G Coherent Optical Module?

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