Data Sheet

7

- GND / GND-TEC:

Ground reference pin and package potential. All voltages are referred to this node.

- V

CC:

General positive power supply of the module. Typical value : + 5.0 V.

- V

TEC:

TEC (Thermo-Electrical Cooler) supply. Typical value + 3.3 V.

- DATAP / DATAN (Data inputs):

NRZ data input, internally AC coupled with 50 ohm internal termination. A logical "1" of D is related to a light on state on the optical fibre.

Data line is retimed at the input of the module by the input clock signal when the function is selected.

In case of operation in the transparent mode of the transmitter no internal signal regeneration function is provided.

Input impedance: 50 V typical.

- CLKP / CLKN (Clock inputs):

Clock inputs internally AC coupled with 50 ohm internal termination. The rising edge of the clock+ signal must be central to the

steady state of the data pattern.

Input impedance: 50 V typical.

- TXDIS (TX disable input):

Under shutdown condition the output power should be low enough so that any receiver, in minimum span condition,

will generate an LPA (Loss of Power Alarm).

When TXDIS is high the TX module is disabled (no optical output power).

When TXDIS is low (or open) the TX module is in the operating condition.

TTL compatible input. Input includes pull down resistance of 100 kV typical.

- CSEL (Selection of data input clocking mode - future enhanced feature):

When CSEL is high the module operates in the non clocked mode, this is the supported operational mode for the MT10EW.

TLL compatible input. Pull down resistance of 100 kV typically.

- LDA (Laser degradation alarm):

Digital alarm indicating that the laser is degraded. LDA activation

The active level is a low level.

The alarm shall not be activated in shutdown condition.

TTL compatible output.

- LTDA (Laser temperature degraded alarm):

Alarm indicating when the laser temperature exceeds the recommended operational limits. LTDA activation T

hysteresis +/-0.5°C.

The active level is a high level.

TTL compatible output.

- PWR_MON (Back Facet Monitor):

Laser back facet monitor derived voltage. This monitor produces a scaled varying analogue voltage that tracks the transmitted

optical output power.

Output impedance < 10 V typically.

- NUC:

No user connection, this pin can be tied to any static potential within the operating supply range.

- I2C & GUI interface (future enhanced feature):

The module includes an I2C interface bus which enables the user to interogate the module alarms and monitors using a host controller.

- Wavelength drift alarm (future enhanced feature):

An option exist to provide a wavelength drift alarm using the LTDA alarm port, which activates when the laser wavelength

exceeds +/-30pm of the SOL (start of life) value.

Instructions for use