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Inline Amplifier (ILA)

 

The ILA module is a standard service module that fits into a single slot of a BTI7800 Series chassis. It provides unidirectional DWDM C-band amplification and tilt control. All ports are accessible from the front of the module.

The L1 port connects to the network span. The C1 port connects to other local ROADM elements that together provide the overall ROADM nodal functionality. The EXP port provides access to the EXP-band wavelengths in the expanded range, and can be used to connect to OTDR equipment. The MON port allows you to monitor the output of the amplification stage for signals coming in from the L1 port, and for signals launching from the L1 port. The PRE port connects externally to the PRE module in the PRE slot. The PRE slot accepts the CFP2-format PRE module, which provides supplementary amplification of the incoming line signal.

The main functional blocks of the ILA module are shown in Figure 1.

Figure 1: ILA Block Diagram
ILA Block Diagram

The Amplification block compensates for incoming span losses in the composite C-band signal.

The PRE module provides supplementary amplification when desired. The module has a CFP2-based form factor, and is inserted in the PRE slot of the ROADM host module. The PRE module has an external optics port that connects to the PRE port of the host module.

The Output Control block multiplexes and launches the signal (C-band, EXP-band, OSC) out the line port.

OSC is supported on the 1511nm wavelength on the L1 port, and on the 1310nm wavelength on the C1 port (and EXP).

Figure 2 shows the signal flow through the ILA module.

Figure 2: ILA Signal Flow
ILA Signal Flow

C-Band

In the line-in direction, the incoming C-band channels from the L1 port are diverted out the PRE port to the PRE module for pre-amplification, and then passed back in the PRE port. The decision to send the C-band channels to the PRE module is under operator control. Next, the C-band channels are passed through the main amplification stage and sent out the C1 port.

In the line-out direction, the incoming C-band channels from the C1 port are multiplexed with the OSC and with the EXP-band channels from the EXP port, and transmitted out the L1 port.

EXP-Band

The EXP-band channels carry wavelengths in the expanded DWDM range, and can be used for OTDR test equipment. These channels are not amplified by the ILA module.

In the line-in direction, the incoming EXP-band channels from the L1 port are immediately diverted out the EXP port for external processing (such as by an OTDR). The EXP-band channels are passed back in the EXP port and multiplexed with the C-band and OSC signals and transmitted out the L1 port.

OSC

The OSC carries ROADM and management communications signals between ROADM elements and nodes.

On the L1 port, the OSC is carried on the 1511nm wavelength, and on the C1, C2, and EXP ports, the OSC is carried on the 1310nm wavelength.

Monitoring Points

The ILA module provides diagnostic equipment (connected to the MON port) monitoring access to internal blocks.

In the line-in direction, the monitoring point is immediately after the main amplification stage. In the line-out direction, the monitoring point is after the C-band channels and OSC have been multiplexed together.

ILA Specifications

Table 1: ILA (BT8A78AMPL) Specifications

Parameters

Range

Physical

Width

29 mm

Height

322 mm

Depth

280 mm

Maximum number of modules supported

A maximum of 2 ILA modules is supported in a single or multi-chassis BTI7800 system.

The other slots in the system can be populated with other BTI7800 modules but cannot be populated with ROADM or ILA modules. ROADM and ILA modules cannot co-exist in the same system.

Environmental

Temperature and Humidity

See Site Requirements.

Power Consumption

Typical: 50 W

Maximum: 55 W

Optical

Minimum

Typical

Maximum

Central Wavelengths (C-Band)

1528.77 nm

 

1566.72 nm

Number of channels (50-GHz spacing)

  

96 channels

Supported Span Loss (line port, without PRE)

  

23 dB

Supported Span Loss (line port, with PRE)

21 dB

 

33 dB

Monitor In Port Loss1

18.3 dB

 

21.9 dB

Monitor Out Port Loss2

18.3 dB

 

21.9 dB

L1 Composite Input Signal Power

-23.0 dBm

 

11.1 dBm

C1 Composite Output Signal Power

1.7 dBm

 

22.8 dBm

Wavelength (OSC, Line Port)

1504.5 nm

1511.0 nm

1517.5 nm

Wavelength (OSC, Client Ports)

1266 nm

1310 nm

1360 nm

Wavelengths (EXP-Band)

1576.2 nm

 

1640.0 nm

Automatic Power Shut Down (APSD)

Client and line ports

Fiber Type

SMF-28 or equivalent

Connector

LC/UPC

CFP2

See PRE Specifications.

LEDs

See Service Module LEDs.

Port LEDs

Active (Green)

The port is operating normally.

Fault (Amber)

A fault exists on the port.

1 Relative to C1 Out.

2 Relative to L1 Out.

ILA Latches

The ILA latches are similar to the UFM3 latches, and must be fully closed for proper module operation.

Figure 1 shows the top latch of the ILA in the open and closed positions.

Figure 3: Top Latch - ILA
Top Latch - ILA

The bottom latch on a (Figure 2) has an extendable handle that provides leverage when you open or close the latch.

Figure 4: Bottom Latch - ILA
Bottom Latch - ILA

Installing an ILA

Use this procedure to install an ILA module.

Prerequisites:

  • If you have pre-provisioned the module, ensure the module is administratively enabled. If the module is not administratively enabled, the module will not be acknowledged by the CMM. For information on how to enable the module, see the BTI7800 Software Configuration Guide.

  • If you have not pre-provisioned the module and you are relying on auto-provisioning, then the system will automatically provision and enable the module for you. You do not need to manually enable the module in this case.

Tools Required

  • Number 2 Phillips screwdriver

Note

Be familiar with the site, safety, and installation guidelines described in Module Installation and Removal Guidelines.

Note

Limits exist on the number of ILA modules you can install in a BTI7800 system. See ILA Specifications for more information.

  1. Remove the filler panel from the slot into which you are installing the module and store it in a safe place for future use.
  2. Remove the module from its antistatic bag, holding it by its edges and faceplate to prevent damage to the module circuitry.

    Visually inspect the module, including the pins and connectors that attach to the backplane, for signs of damage before installation.

  3. Insert the module.
    1. Ensure that all latches are in the open position and that the black handles are extended. See ILA Latches.

    2. Position the module.

      • BTI7814: Position the module vertically so that the faceplate is toward you and the latches are on the left side.

      • BTI7802: Position the module horizontally so that the faceplate is toward you and the latches are on the bottom.

    3. Align the module with the slot guides.

    4. Insert the module edges on the slot guides.

      Carefully slide the module until it connects to the backplane and push in firmly.

    5. Close the latches by moving both latches to the inward position and push in until they fully close.

      The latches are angled slightly outward from the faceplate when fully engaged.

    6. Retract the black handles.

  4. Gently tighten the faceplate thumbscrews. Use a screwdriver if necessary.

You have successfully completed this procedure.

Removing an ILA

Use this procedure to remove an ILA from a chassis.

Prerequisites:

  • Ensure the module is administratively disabled. When the module is administratively disabled, the hot-swap LED shows a solid blue. For information on how to disable the 96-Channel Amplifier, see the BTI7800 Software Configuration Guide.

Tools Required

  • Number 2 Phillips screwdriver

  • Antistatic bag

Note

Be familiar with the site, safety, and installation guidelines described in Module Installation and Removal Guidelines.

  1. Ensure the hot-swap LED is solid blue.
  2. Move fibers aside as needed to get clear access to the module.
  3. Disconnect the fibers to all ports.Caution

    When working with the Inline Amplifier modules, follow the safety procedures associated with equipment containing Laser Safety Hazard Level 1M. The Inline Amplifier supports Automatic Power Shut Down (APSD) on the client and line ports.

  4. Loosen the two faceplate thumbscrews located at the top and bottom of the module. They should spring out freely when fully loosened. Use a screwdriver if necessary.
  5. Extend the black handles on the latches to give you more leverage. See ILA Latches.
  6. Unseat the module by simultaneously moving both latches to the open position.
  7. Gently slide the module out of its slot and place it into the antistatic bag.
  8. Install a filler panel in the empty slot.

You have successfully completed this procedure.