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Huawei OptiX BWS 1600G. Technical Description - part 2

1 Overview

OptiX OSN 9500

160 channels

32 channels

Backbone Layer

OptiX BWS 320G

OptiX Metro 6100

OptiX Metro 3100

OptiX Metro 6100

OptiX 10G

32 channels

STM-16

STM-64

Convergence Layer

OptiX 2500+

OptiX Metro 6100

OptiX 10G

OptiX Metro 1000

OptiX 155/622

OptiX 2500+

STM-4/1

OptiX 155/622

STM-4

STM-16

STM-4/1

Access Layer

OptiX Metro 1000

STM-4/1

OptiX Metro 3100

OptiX Metro 500

Figure 1-1 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/demultiplexer

Erbium-doped optical fibre amplifier

Raman amplifier

Channel equalisation technology

SuperWDM technology

Dispersion compensation technology

Universal and centralised network management system

Figure 1-2 shows the appearance of the OptiX BWS 1600G cabinet.

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1 Overview

Figure 1-2 Appearance of the OptiX BWS 1600G

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1 Overview

1.2 Types of the OptiX BWS 1600G

Classification of System Types

To meet the requirements of different areas, users and investing environments, the

OptiX BWS 1600G is available in six types:

OptiX BWS 1600G-I

OptiX BWS 1600G-II

OptiX BWS 1600G-III

OptiX BWS 1600G-IV

OptiX BWS 1600G-V

OptiX BWS 1600G-VI

In later sections, 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.

Characteristics of Each System Type

Table 1-1 shows the characteristics of the six system types.

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1 Overview

Table 1-1 Characteristics of system types

Type

III

Item

Maximum capacity

1600

800

400

100

400

100

(Gbit/s)

Working

C-band and

C-EVEN and

C-band

C-EVEN (Note 1)

L-ODD

C-EVEN (Note 1)

wavelength band

L-band

L-ODD (Note 1)

(Note 1)

Channel spacing

100

200

(GHz)

Maximum number

160

of channels

Maximum accessing

2.5

rate (Gbit/s)

Transmission

360

560

1600/1120

2000 (Note 3)

400

640

200/230 (Note 7)

distance without

(Note 5)

REG (km) (Note 2)

Per-channel output

4/1 (Note 6)

4/1/0 (Note 4)

power of amplifier

(dBm)

Fibre type

G.652/G.655

G.652/G.653/G.6

G.653

G.652/G.655

Clock protection

Supported

Not

Not supported

Not

Not supported

function

supported

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1 Overview

Type

III

Item

Accessing service

SDH/SONET

SDH/SONET/P

SDH/SONET

SDH/SONET/PO

SDH/SON

SDH/SONET/POS

type

/POS/GE/10

OS/GE/10GE

/POS/GE/10

S/GE/10GE/arbit

ET/POS/G

/GE/arbitrary

/GE/10GE/arbitrar

GE/arbitrary

rary service at a

E/10GE

service at a rate of

y service at a rate of

service at a

rate of 34 Mbit/s

34 Mbit/s - 2.5

rate of 34

- 2.5 Gbit/s

Gbit/s

Mbit/s - 2.5

Gbit/s

Maximum numbers

160

of add/drop

channels(Note 8)

Dispersion

Required

Not required

Required

compensation

Note 1: C-EVEN indicates even channels (40 channels in total) in C-band and the L-ODD indicates odd channels (40 channels in total) in L-band.

Note 2: The data in the above table is for system without adopting the Raman amplification technology. If the technology is adopted, the longer transmission distance without any REG

will be supported. Here the distance is computed out with an attenuation coefficient of 0.275 dB/km.

Note 3: With technologies such as FEC, SuperWDM and optical equilibrium being applied, the transmission distance without any REG reaches up to 2000 km in the type III systems.

Note 4: Per-channel output optical power of the optical amplifier in the type III system is 4 dBm on G.652/G.655 fibre, and 1 dBm or 0 dBm on G.653 fibre.

Note 5: The data is for particular fibre and line code. The distance of 1600 km is for G.652 fibre with return to zero (RZ) encoding and 1120 km for G.655 fibre with RZ encoding.

Note 6: The type II C800G system provides two types of amplifiers. The output optical power of one type is 23 dBm, and that of the other type is 20 dBm.

Note 7: The 200 km refers to the LHP system and 230 km refers to ROPA system with a fiber attenuation coefficient of 0.275 dB/km.

Note 8: The maximum numbers of add/drop channels refer to the channels added/dropped in OADM stations by back to back OTMs. Besides, with the dynamic wavelength control

(DWC) board, the system can block or pass through channels of any wavelengths. The channels are added/dropped dynamically. This is how the OptiX 1600G forms a dynamic ROADM

that can be restructured.

By system channel spacing, the OptiX BWS 1600G system can be divided into three categories: 50 GHz channel spacing

system, 100 GHz channel spacing system and 200 GHz channel spacing system. Refer to Table 1-1.

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1 Overview

1.3 Features

Huge Transmission Capacity

Transmission 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 with

2.5 Gbit/s or 10 Gbit/s.

Long Haul Transmission

When 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 Access

The OptiX BWS 1600G accesses the following service types:

Standard SDH: STM-1/4/16/64

Standard synchronous optical network (SONET): OC-3/12/48/192

Standard SDH concatenated payload: VC-4-4c/16c/64c

Standard SONET concatenated payload: STS-3c/12c/48c/192c

ETHERNET: Gigabit Ethernet (GE), 10GE

Other 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)

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1 Overview

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.

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1 Overview

1.4 Characteristics

1.4.1 Service Characteristics

Low-Speed Service Aggregation

The OptiX BWS 1600G supports the aggregation of low-speed services. It can:

Multiplex two channels of GE signals into one channel of STM-16 signal.

Multiplex two channels of GE signals into one channel of OTU1 signal.

Multiplex eight channels of FC100 signals into one channel of OTU2 signal.

Multiplex eight channels of GE signals into one channel of OTU2 signal.

Multiplex four channels of STM-16 signals into one channel of OTU2 signal.

Multiplex four channels of FC200 signals into one channel of OTU2 signal.

High-quality Clock Transmission

The OptiX BWS 1600G offers a new solution for the transmission of synchronous

clock. Its optical supervisory channel provides three clock transmission channels

operating at 2.048 Mbit/s. The clock signals can be added/dropped or just pass

through at any station.

Scalable Optical Add/Drop and Multiplexing Technology

The OptiX BWS 1600G system can add/drop 32 channels at most by cascading

optical add/drop multiplexing boards.

1.4.2 Technical Characteristics

Forward Error Correction

The OTU uses FEC and AFEC (advanced FEC) technologies to:

Decrease the requirements on the receiver optical signal-to-noise ratio

(OSNR), to stretch the span of optical amplification sections or optical

regeneration sections.

Decrease the bit error ratio (BER) in the line transmission, to improve the

quality of service (QoS) of DWDM networks.

AFEC is a new error correction technique that adopts two-level encoding. It has

increase in encoding gain, and can equally distribute burst errors. AFEC is more

powerful than FEC.

Tunable Wavelengths

The OptiX BWS 1600G supports tunable wavelengths. It adopts 10 Gbit/s and 2.5

Gbit/s OTUs that support tunable wavelengths, such as the LWF and the LWC1.

The 10 Gbit/s OTU supports tunable wavelengths in up to 80 channels with 50 GHz

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1 Overview

spacing. The 2.5 Gbit/s OTU supports tunable wavelengths in up to 40 channels

with 100 GHz spacing. Besides function as service boards, the tunable wavelength

OTUs also function as spare parts to substitute OTUs of different wavelengths. This

reduces the amount of OTUs and lowers the cost.

Mature EDFA Technology

The OptiX BWS 1600G uses mature erbium-doped fibre amplifier (EDFA)

technology for the amplification of C-band and L-band signals, and the implement

of long haul transmission without REG. EDFA adopts gain locking technology and

transient control technology to make the gain of each channel independent of the

number of channels. Bit error bursts in the existing channels are also avoided

during adding or dropping channels.

Advanced Raman Amplification Technology

Besides the EDFA amplification, the system also supports Raman fibre

amplification. The hybrid application of the Raman and EDFA achieves broad gain

bandwidth and low system noise, and reduces the interference of non-linearity on

the system, which thus greatly stretches the transmission distance.

Unique SuperWDM Technology

By using the RZ encoding and unique phase modulation technology, the OptiX

BWS 1600G is able to effectively suppress the non-linear impairments in

transmission and improve the noise tolerance capability. With the SuperWDM

technology, the OptiX BWS 1600G achieves ultra long haul application in the

absence of Raman amplifiers.

Jitter Suppression

Due to advanced jitter suppression and clock extraction technology is adopted, the

jitter performance of the OptiX BWS 1600G is better than the requirements defined

by ITU-T Recommendations related to DWDM. OTUs of the system also check B1

and B2 bit errors, and extract J0 bytes. Thus when accessing the SDH equipment,

the system can quickly detect whether the bit error occurred to the SDH section or

the optical path. This function is of critical importance when the OptiX BWS

1600G system accesses the SDH equipment of different vendors.

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1 Overview

1.4.3 Intelligent Adjustment

Automatic Level Control

The system applies automatic level control (ALC) function to control the power

along the link, thereby ensuring the normal laser level in the optical fibre. The ALC

function keeps the optical signal at normal level and prevents the input and the

output power of the downstream optical amplifiers from declining. This improves

the quality of the transmission signals.

Intelligent Power Adjustment

The intelligent power adjustment (IPA) protects the human body from the exposure

to the laser, which can be emitted from an open interface or fibre cracks. If there is

a leakage of optical power, the system will reduce the power to that lower than the

safe threshold.

Automatic Power Equilibrium

In long haul transmission, the non-flatness of per-channel OSNR at the receiving

end becomes a serious issue. With the automatic power equilibrium (APE) function,

the OptiX BWS 1600G can automatically adjust the launched optical power of each

channel, thus achieving power equilibrium at the receiving end and improving the

OSNR. The APE is well suited for the applications with many spans.

Intelligent Environment Temperature Monitoring System

The OptiX BWS 1600G is designed with intelligent system for environment

temperature monitoring, reporting and alarming. This ensures the normal running

of the system under a stable temperature.

1.4.4 Automatic Monitoring

Optical Fibre Line Automatic Monitoring Function

The OptiX BWS 1600G offers an optical fibre line automatic monitoring system

(OAMS) to alert the aging of a fibre, alarm the fibre fault and locate the fault. The

OAMS is a built-in system, which is optional for ordering.

In-Service Optical Performance Monitoring

There are optical monitoring interfaces on multiplexer/demultiplexer, optical

amplifier, and so on. Optical spectrum analyser or multi-wavelength meter can be

connected to these monitoring interfaces, to measure performance parameters at

reference points while not interrupting the service.

These monitoring interfaces can also connect to built-in optical multi-channel

spectrum analyser unit (MCA) by using optical fibres. With the help of an MCA,

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1 Overview

optical spectral features including the optical power, central wavelength and OSNR

can be observed from a network management system (NM).

1.4.5 Reliabilty

Perfect Protection Mechanism

The OptiX BWS 1600G provides a perfect protection mechanism, including optical

channel protection, optical line protection and equipment level unit protection.

The system clock is protected by the 1+1 backup of clock units.

Automatic Laser Shutdown

For an OTU, if ALS is enabled, the OTU board will shut down the laser on the

WDM side to avoid the laser injury to the human body when there is no optical

power received on the client side.

Also, when there is no optical power received on the line side, the OTU board will

shut down the laser on the client side to avoid the laser injury to the human body.

But if ESC is performed, ALS function must be disabled because the supervisory

information has been multiplexed into the transmitting channel by the OTU

boards.

For more details, refer to section 2.3.2 "Configuring the WDM Interface

Attributes of a Board" in OptiX BWS 1 600G Configuration Guide.

Reliable Power Backup

The power supply system of the OptiX BWS 1600G is fed with two DC inputs (for

mutual backup). The power supply of key units is protected by 1+1 hot backup. The

power of OTU boards is protected by a common protection power feed.

Perfect Optical Fibre Management Function

The OptiX BWS 1600G fully considers the demands for fibre management.

Various cabling channels and fibre storage units are available to ease the fibre

management in the cabinet and between the cabinets.

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