Fiber Optical Transceiver 100G QSFP28 ZR4 LWDM operats at 1310nm over single-mode fiber, it provides a remarkable 40km reach. This allows for seamless connectivity between different nodes within city, such as data centers, corporate offices, and government institutions. The LWDM technology multiplexes wavelengths, enhancing bandwidth utilization. The qsfp28 transceiver can handle the simultaneous transmission of high-definition surveillance footage, public transportation data, and e-government services information. Its compatibility with the QSFP28 form factor simplifies installation and integration into existing MAN infrastructure, making it an essential component for upgrading urban network capabilities.