The PROMAX EF970 Basic Fiber Optic Communications Training System trainer is an innovative system designed for training, demonstration and experimentation with the Fibre Optics communication systems, the phenomenon related to light and the principles of transmission through Optical Fibres; as well as the latest tendencies like LASER and WDM (wavelength multiplexing).

Emitter Kit: 8 Inputs

The instrument possesses eight selectionable inputs. The input signal may be selected, either channel 1 (CH 1) or channel 2 (CH 2), the same input may also be used for both channels.

1 - LF generator: sinusoidal, triangular or square (internal) signal

2 - DC analog input (75 Ohm) (external)

3 - AC analog input (75 Ohm) (external)

4 - Microphone (monophonic) (external)

5 - Digital input (External)

6 - Inverted digital input (External)

7 - Digital input permanently on "1" (internal)

8 - Digital switch "1" / "0", using the TL1 key (internal)

Channels 1 and 2

The emitter kit consists of 2 independent channels (channel 1 and channel 2) that enable signals to be transmitted from any optical input and control the amplification of the input signal level. Includes channel overload or saturation indicator.

LF Generator (Square, Triangular, Sinusoidal)

The LF generator possesses four control buttons to select the wave form (square, triangular or sinusoidal) and the frequency.

Milliammeter

The emitter kit consists of a digital milliammeter showing the polarisation current flowing through the chosen photoemitter. The channel to be measured is selected with the "A METER CH1/CH2" button.

Optical Outputs

The emitter kit has five cyclically selectable photo-emitters. Two photo-emitters may be activated at the same time for the WDM application. The photo-emitters have a protection circuit to limit optical power.

Laser Feedback

The nature of the LASER means that its optical power may be influenced by external factors such as temperature, ageing, etc. The feedback circuit is able to maintain a stable and unalterable optical power no matter what the external conditions are. The system can operate with the feedback circuit ON or OFF so to test its efficiency and the problems caused by its disconnection and/or malfunction.

Receiver

The receiver kit principally consists of two independent blocks (except for the input circuits: photo-detectors and switches), one for the signal and the other for measuring. The signal block contains two channels, also independent, one for receiving analog signals and the other for digital signals. The measuring block contains the power meter, enabling operation in four different modes: analog, digital, 1 kHz and DC.

Optical Inputs

The receiver has two incorporated photo-detectors and an external photo-detector (optional) that connects to the "EXT. SENSOR" input by a coaxial cable (optional).

Analog Channel Signal Block

The analog channel has a gain of 40 dB, using two 20 dB amplifier stages. The signal block possesses a switch to select the type of coupling, DC or AC, applied to the first amplifier input and to the analog channel output section. The audio section consists of an independently-adjustable low-pass for regulating the level of the signal applied to the internal speaker or headphones.

Digital Channel Signal Block

The signal entering the digital channel follows a series of filtering and amplification processes for subsequent comparison with a reference level. The amplitude of the channel output may be selected as either TTL level or RS-232 level.

Optical Power Meter

This block performs the absolute or relative measurement of the received optical power. The optical meter possesses four measuring modes, selected by the user:

1 - ANALOG (monitoring mode)

2 - DIGITAL (monitoring mode)

3 - 1 kHz (precision mode, for measuring the 1 kHz component)

4 - DC (precision mode)

The resolution of the power meter in the monitoring modes is 0.1 dB, and 0.01 dB in the precision modes.