ORA

ORA-C-450-FG, a 1RU optical amplifier is based on Raman amplification. It consists of dual pump around 1450nm with ~450 mW optical power such that when used in single mode fiber, a typical gain of ~ 10dB in counter propagating mode can be achieved with very low effective noise figure. This enables longer reach spans for high loss networks. It can be housed in a stand-alone 1 RU 19’’ sub-rack. The ORA-C-450-FG has redundant -48V DC power supply unit.

This unit can be interfaced to Element Management Software (EMS) as standalone unit or integrated through the product using the RJ45 NMS port.

Front panel

The following figure shows the front panel of ORA-C-450-FG card.

Power specifications

ORA-C-450-FG - Power Specifications

Visual indicator details

The visual indicators on the ORA-C-450-FG card has two LEDs - the Sts (Status) LED indicate the status of the card and the Act (Active) LED indicates whether the card is active or not.

ORA-C-450-FG - Active and status LEDs indications

LAN interface

The LAN Interface provides a CSMA/CD based LAN transceiver of an Ethernet link. This is available as an RJ-45 connector. The Ethernet address is available in the non-volatile memory on the OAM card.

The LAN interface physical layer is completely implemented in hardware. The physical layer device provides clock recovery, bit timing, equalization and a ‘Jabber’ circuit. The Media Access Control (MAC) function is implemented in software available as part of the microcontroller. ‘Jabber’ circuitry ensures that the transmitter does not hold up the interface for more than a full frame of data.

Two LEDs are used to indicate link status of the connector. The LAN interface is associated with two LEDs, Green and Amber.

LAN interface can be connected directly to the Element Management Software (EMS) and can be connected to the available NMS port on the product.

ORA-C-450-FG - LED status and their significance

External alarms interface

The ORA-C-450-FG card provides seven external alarm outputs.

ORA-C-450-FG can export 7 alarm signals to the system via the maintenance interface. These alarm signals are Power Supply Alarm, Signal Power Alarm, Output Power Alarm, Pump Current Alarm, Pump Temperature Alarm, Module Temperature Alarm, and Fan Alarm.

Operating modes

ORA-C-450-FG has a typical Raman gain of ~10dB at the C band in the transmission optical fiber by using optical pump power of 450mW.

Fixed Gain ORA Card Types

There are two operating modes supported as follows:

• Automatic Gain control mode: In this mode, the ORA is operated at the designed flat gain. Gain feed-back controller is active in this mode. This mode enables to add the new channels without affecting the existing channel power.
• Maximum Power control mode: In this mode, the ORA is set to operate at the maximum pump power.

ORA-C-450-FG is used for optical amplification in the POTP and DWDM configuration of the product.

In general, ORA-C-450-FG is followed by the OFA cards to boost the incoming signal strength so that the receive power will be adequate.

Typical specifications

Typical specifications of the Raman amplifier are as follows:

• Unit supports APR functionality.
• Supports C-band DWDM amplification.
• Output monitor port of with 1 % tap.
• Support for AGC mode and optional maximum pump power operating modes.
• Supports NMS port.
• Supports hardware alarm interface for alarms.
• Supports redundancy on -48V input supply voltage.
• Meet Class 1M safety requirements.

The following table summarizes the different parameters and its typical values:

ORA unit parameters and typical values