Background

In today's highly developed network, mobile communication has become a hot technology with high development potential and wide market prospect in the contemporary communication field, and various vendors are continuously launching new technologies to quickly seize the dominant position. In order to expand network coverage and allow more users to better enjoy wireless services, operators are stepping up the construction of base stations. However, there are certain challenges in the construction of base stations.
● The huge number of base stations means high construction investment, site support, site lease and maintenance cost, and building more base stations means more capital expenditure and operation expenditure.
● The difficulty of choosing the site for base stations is a very important factor in addition to the current density of base stations, the general public's awareness of their own health and environmental protection is also a very important influence. Server room resources are necessary for station site resources, however, they are becoming more and more difficult to obtain; a large number of access server rooms in the existing network cannot meet the demand for server rooms for traditional-style network construction.
If a BBU pool places 10 BBUs, 60 cores of fiber optic cable will be used, which is not only astronomical in fiber optic cable investment, but also unbearable in pipe hole resources, and urban pipe resources are "hard to buy"!

H&T's passive coarse wavelength division is suitable for transmission between fiber resources, fiber optic cable laying difficulty, with low cost, zero power consumption, small volume, high performance characteristics. H&T's CWDM system transmission equipment can replace fiber optic cable laying, to enhance the bandwidth utilization at a lower cost, mainly for short and medium distance optical network construction, especially suitable for optical cable laying inconvenience, fiber resources and other needs to enhance the bandwidth utilization, providing users with a low-price, high-performance transmission solutions. CWDM technology can improve the security and service recovery capability of the network through the optical multiplexing segment protection and other functions.

Introduction of Passive Wavelength Division Network Solution
The following will be divided into 3 scenarios to introduce the application of passive WDM solutions.

Scenario 1: Point-to-point, double-star network

Description of network application scenarios.
● LTE macro station, indoor distribution.
● The distance between BBU and RRU sites is far >1KM.
● Support the distance between BBU and RRU in the range of 1~70KM.
● Scenarios where there is no condition for new fiber laying in areas with scarce fiber resources.
● As an emergency solution to solve the fiber problem temporarily due to the construction period.

Scenario 2: Multi-service integrated access, dual-star network




Description of network application scenario.
● Multi-service bearing
● Access to wireless sites such as GSM, TD, LTE, etc.
● Remote site service access such as PTN, IP MAN, etc.
● The scenario of unconditional new fiber laying in areas with scarce fiber resources.
● Temporary solution of fiber optic problem as an emergency solution due to the construction period.
● Using 1-core fiber to realize multi-service access at remote sites.

Scenario 3: Tunnel, room division, chain type network




Network application scenario description.
● Access to wireless sites of GSM, TD, LTE, etc.
● When BUU and RRU are serially grouped, such as in tunnel, indoor distribution, high-speed railway line, etc.
● Scenarios where there is no condition for new fiber laying in areas where fiber resources are scarce.
● Temporary solution of fiber optic problem as an emergency solution due to the construction period.
● Using 2-core fiber to realize multiple RRU access.
● Different wave numbers can be customized for landing at different sites on the chain according to actual needs.

Scenario 4: OLT uplink service bearing



Description of network application scenario.
● Scenario of unconditional new fiber laying in areas with scarce fiber resources.
● Temporary solution to the fiber problem as an emergency solution due to the construction period.
● Using 1-core fiber to realize point-to-point service access.
● Scarcity scenario of fiber optic cable between switch and OLT.

Solution advantages
● H&T Optoelectric passive coarse wavelength division products have many advantages such as low cost, low power consumption and small size, which is a low price and high performance transmission solution. Now passive coarse wavelength division products have been used in 4G LTE base station long-distance transmission.
● The color optical module can be applied to RRU/BBU equipment of ZTE, Huawei, Norwest, Bell, Ericsson and other mainstream manufacturers, and the power consumption meets the relevant requirements of wireless master equipment, and has complete interoperability and compatibility with SFP+ interface of base station equipment.
● Passive fiber extender can be upgraded smoothly and customized accordingly according to requirements, suitable for various installation scenarios: indoor 19-inch rack on, wall-mounted. Outdoor: wall-mounted, pole-holding, with IP55 waterproof and dustproof rating easy installation, plug-and-play, easy maintenance, easy fault location characteristics.
● No need for server room, greater reduction of network construction cost, saving the cost of laying optical cable, rational use of existing resources
● Energy saving and consumption reduction, no air conditioning, and greater reduction of energy consumption Passive power supply is not required, and the construction of supporting equipment is reduced.
● Optimized transmission, direct access to the convergence layer, optimized transmission structure, reduced time delay and reserved sufficient resources for later construction.
● Operation and maintenance, construction period, greater reduction of the construction period, to achieve rapid operation ● Lower operation and maintenance costs, less affected by the environment and supporting resources

H&T passive CWDM Mux/Demux

H&T passive DWDM Mux/Demux