Huawei Optix Bws 1600g DWDM Optical Transmission Equipment for Backbone Networking

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Huawei OptiX BWS 1600G Overview
The OptiX BWS 1600G Backbone DWDM Optical Transmission System, the OptiX BWS 1600G for short, is a large capacity and long haul backbone transmission product. It is designed in line with the present conditions and the future development of optical networks, with inherited flexible configuration and good compatibility of OptiX series. With the modular design that enables rich configurations and flexible protection features, the OptiX BWS 1600G plays a leading role in a transmission network. The access capacity of an optical fibre can be smoothly expanded from 10 Gbit/s to 1600 Gbit/s (160 × 10 Gbit/s). During the expansion, there is no need to shut off the equipment or interrupt the service. Just insert new hardware or add new nodes. The OptiX BWS 1600G system can be deployed in point-to-point, linear and ring networks. Being a backbone layer of the network, it connects main cities to carry heavy traffic of optical switching equipment, metropolitan area network (MAN) DWDM equipment, SDH equipment or router. That is providing large capacity transmission channel for services and network outlets. The position of an OptiX BWS 1600G system in a network is shown in Figure 1.


Figure 1 OptiX BWS 1600G in a transmission network
The OptiX BWS 1600G transmits the unidirectional services over a single fibre, that is, a bi-directional transmission is achieved by two optical fibres, of which one is for transmitting and the other for receiving.

The OptiX BWS 1600G is highly reliable in performance and flexible in networking by using:
 Reliable multiplexer/demultiplexerErbium-doped optical fibre amplifierRaman amplifierChannel equalisation technologySuperWDM technologyDispersion compensation technologyUniversal and centralised network management system 
Figure 2 shows the appearance of the OptiX BWS 1600G cabinet
Figure 2 Appearance of the OptiX BWS 1600GClassification of System TypesTo meet the requirements of different areas, users and investing environments, the OptiX BWS 1600G is available in six types:
 OptiX BWS 1600G-IOptiX BWS 1600G-IIOptiX BWS 1600G-IIIOptiX BWS 1600G-IVOptiX BWS 1600G-VOptiX BWS 1600G-VI
The OptiX BWS 1600G-I is referred to as the type I system for short, and other types are the type II, type III, type IV, type V and type VI systems. If there is no type identity, for example, the OptiX BWS 1600G, it refers to all system types.

 FeaturesHuge Transmission CapacityTransmission capacity of the type I system can be upgraded up to 1600 Gbit/s by adding modules of 400 Gbit/s capacity. In a module of 400 Gbit/s capacity, the capacity can get increments with 10 Gbit/s.Transmission capacity of the type II system can be upgraded from 400 Gbit/s to 800 Gbit/s. In a module of 400 Gbit/s capacity, the capacity can get increments with 10 Gbit/s.Maximum transmission capacity of the type III/IV system is 400 Gbit/s. In a module of 400 Gbit/s capacity, the capacity can get increments with 10 Gbit/s.Maximum transmission capacity of the type V system is 40 × 2.5 Gbit/s. In the module, the capacity can get increments with 2.5 Gbit/s.The type VI system, a long hop application, is classified as 10-channel system and 40-channel system. In the module, the capacity can get increments with2.5 Gbit/s or 10 Gbit/s.
 Long Haul TransmissionWhen forward error correction (FEC) technology is used, the system allows an attenuation of 10 % 22 dB for transmission without REG.When technologies such as FEC, SuperWDM and optical equilibrium are used, the system allows an attenuation of 25 % 22 dB for transmission without an REG.When FEC and optical amplification technologies are used, the system allows an attenuation of 56 dB in long hop application. Upon this result, the remote optical pumping amplifier (ROPA) technology can extend long hop transmission up to 64 dB attenuation. Abundant Service AccessThe OptiX BWS 1600G accesses the following service types:
 Standard SDH: STM-1/4/16/64Standard synchronous optical network (SONET): OC-3/12/48/192Standard SDH concatenated payload: VC-4-4c/16c/64cStandard SONET concatenated payload: STS-3c/12c/48c/192cETHERNET: Gigabit Ethernet (GE), 10GEOther service: Services at the rate ranging from 34 Mbit/s to 2.5 Gbit/s, such as enterprise system connection (ESCON), fibre connection (FICON), fibre channel (FC), fibre distributed data interface (FDDI) and PDH (34 Mbit/s, 45 Mbit/s or 140 Mbit/s)
The type I and type IV systems only access SDH, SONET, GE, 10GE, FC100 and POS services at 2.5 Gbit/s and 10 Gbit/s. The type II, type III, and type VI systems access all the services listed above. The type V system can access the services only at 2.5 Gbit/s and below.
 Supervisory Channel and Clock Transmission Channels
The optical supervisory channel (OSC) mainly carries orderwire and network management information. The OptiX BWS 1600G transmits supervisory signals at 1510 nm or 1625 nm, with the rate of 2.048 Mbit/s. The electric supervisory channel (ESC) does not demand the configuration of optical supervisory channel units. In this mode, the optical transponder unit (OTU) multiplexes the supervisory information into the service channel for transmission. The OptiX BWS 1600G also provides three clock transmission channels with high quality in each transmission direction, each at a rate of 2.048 Mbit/s. The three channels are embedded into the OSC.Integrated System and Open System Compatibility
There are two types of DWDM systems: integrated DWDM system and open DWDM system. The open DWDM system is configured with OTUs to convert non-standard wavelengths into ITU-T G.694.1-compliant wavelength. The integrated DWDM system does not need the OTUs when its client side equipment (for example, SDH equipment) has ITU-T G.694.1-compliant optical transmitter interfaces. The OptiX BWS 1600G achieves the combination of open and integrated systems. Centralised Intelligent Network Management
The OptiX BWS 1600G can be managed by the centralised NM due to its excellent interconnectivity with other Huawei products.Functional Units
This section describes the basic functional units (boards) of the OptiX BWS 1600G system. According to their functions, the boards can be categorized as:
 Optical transponder unitOptical multiplexer/demultiplexer and add/drop multiplexerOptical amplifier unitOptical supervisory channel and timing transporting unitPerformance monitoring and adjustment unitOptical fibre automatic monitoring unit (optional, not depicted in Figure 3)Protection unit (optional, not depicted in Figure 3)System control and communication unit (not depicted in Figure 3)
Figure 3 shows the positions of the boards in the system, illustrating only the unidirectional signal flow.


              Figure 3 Positions of the boards in the systemTypical ConfigurationType I SystemIn full configuration, an open OTM of the type I system needs six cabinets and 17 subracks, while an integrated OTM needs two cabinets and six subracks. The configuration of OTM is based on the system capacity and upgrading mode. Typically, the type I system adopts the smooth expansion by adding the C-EVEN module, C-ODD module, L-EVEN module, and then L-ODD module. Each module has a maximum capacity of 400 Gbit/s (40 channels) and smooth expansion from 1 channel to 40 channels can be enabled within each module. Figure 4 shows the typical C-band 800 Gbit/s OTM configuration and Figure 3-6 shows the typical L-band 800 Gbit/s OTM configuration.


Figure 4 Configuration of the C-band 800 Gbit/s OTM (type I system)


Figure 5 Configuration of the L-band 800 Gbit/s OTM (type I system)
W Note
If the system provides the line protection function, the OLP01 board needs to be configured. In this case, the Raman amplifier unit cannot be used.
If OTUs need centralised power protection, a PBU board must be configured in slot 1 of the subrack holding OTUs and all OTUs are placed from left to right.Type II SystemThe type II system supports C+L 800G and C 800G. The configuration of C+L OTM can be upgraded from the initial C-band 400G to C+L 800G. See Figure 6.

Figure 6 Configuration of the C+L 800 Gbit/s OTM (type II system)
If OTUs need centralised power protection, a PBU board must be installed in slot 1 of the subrack holding OTUs.

C band OTM supports service expansion form 1 to 80 channels. The typical configuration of the C band 800G OTM is shown in Figure 7.

Figure 7 Configuration of the C band 800 Gbit/s OTM (type II system)Type III, IV and V Systems
Figure 7 shows the configuration of the OTM of the type III system (C-EVEN 400 Gbit/s). The configuration of the L-ODD 400G OTM of the type IV system is similar to that of the type III system, except the boards are in L-ODD band. The configuration of the C-EVEN OTM of the type V system is similar to that of the type III system, but the OTU it uses is no more than 2.5 Gbit/s and no DCM is needed. If the system provides the line protection function, the OLP01 board needs to be configured. In this case, the Raman amplifier unit cannot be used. If OTUs need centralised power protection, a PBU board must be installed in slot 1 of the subrack holding OTUs.

Figure 8 Configuration of the 400 Gbit/s OTM (type III system)Type VI System
Being an LHP, the type VI system provides 10-channel and 40-channel application, which has similar configuration, except the number of OTUs. Figure 9 shows the configuration of the 10-channel system.


Figure 9 Configuration of the 10-channel OTM (type VI system)
The OTM of the type VI system is configured with a high booster amplifier (HBA) at the transmit end and two optical amplifier units (OAU) at the receive end.