Quality Assurance and Test Center

Quality at Huihong Technologies is a process that runs from material procurement to final packing, not a single inspection at the end of the line. Every optical transceiver and every fiber cable assembly we ship has passed through a documented chain of controls: verified incoming components, a standardized production floor, 100% performance testing and reliability screening. This page shows how that program works inside our Shenzhen facility.

Standardized Production Line

SMT placement and reflow line for transceiver PCBA production

Transceiver boards are built on a standardized SMT line with automated solder paste printing, high-speed pick-and-place and controlled-profile reflow soldering. Cable assembly follows documented termination procedures with polishing, curing and geometry control at every station. A dust-controlled environment, anti-static flooring and mandatory ESD clothing keep the production floor within the limits that optical components require.

Incoming Quality Control

Microscope inspection of incoming TOSA / ROSA subassemblies

Optical subassemblies decide the performance ceiling of a finished module, so incoming QC treats them accordingly. TOSA, ROSA and BOSA lots are sampled and inspected under stereo microscopes for die placement, wire bonding quality and window cleanliness, and verified against the supplier data before they are released to production. Ferrules, connector housings and cable drums pass dimensional and material checks. Lots that fail are returned, not reworked.

Optical Power and Wavelength Test

Spectrum analysis and optical power verification at 1310 nm

Every transceiver is measured for transmit optical power and center wavelength against its specification window. Spectrum analyzers confirm the wavelength sits inside the ITU grid or the standards-defined range for the product type, while calibrated power meters verify output power at every port. Units outside tolerance are pulled from the line automatically.

Eye Diagram and Bit Error Rate Test

25.78125 GBd eye diagram with compliance mask and BER verification

High-speed modules are verified on sampling oscilloscopes and bit error rate testers. The eye diagram is checked against the compliance mask for the relevant standard, with rise time, fall time, jitter and extinction ratio recorded per unit. BER testing runs the module at full line rate to confirm error-free operation well below the 1E-12 threshold that network equipment expects.

Temperature Cycling and Burn-In Reliability

Temperature cycling between -40°C and +85°C

Reliability is proven by stress, not assumed. Modules go through temperature cycling between -40°C and +85°C with full traffic running, followed by powered burn-in on dedicated aging racks. Every unit on the rack is monitored, and only modules that complete the cycle with stable optical performance move forward to packing. This screening catches early-life failures before a product ever reaches a customer site.

Fiber Cable Assembly Testing

IL / RL verification of a single-mode patch cord

Patch cords, pigtails and trunk assemblies are tested connector by connector. Insertion loss and return loss are measured at 1310 nm and 1550 nm for single-mode assemblies and at 850 nm and 1300 nm for multimode, against grade limits stated on the product page. End-face geometry and cleanliness are verified by interferometry and video microscope inspection to IEC 61300-3-35 criteria before any connector is bagged.

Compatibility Testing

Switch racks used for on-site compatibility verification

Compatible transceivers are tested in real host equipment, not just on instruments. Our test center keeps racks of switches from Cisco, Juniper, Arista, Mellanox, H3C, Huawei and other mainstream vendors. Each coded module is plugged into the target platform, where we verify recognition, DDM reading accuracy, link stability under traffic and behavior across reboots. The coding of every compatible product is validated against the vendor and model it is ordered for.

Test reports for a specific product or lot are available on request. Send the part number through the contact form and the QC department will provide the corresponding records.