FTLX6611MCC and FTLX6614MCC T-XFP Product Specification – July 2011

F i n i s a r

© Finisar Corporation 2011

1134335 Rev A01

Page 10

Upon a power up, the module will go to a default wavelength (Finisar default channel is

1549.716nm) or the last channel set by the host. If Tx_DIS is asserted upon power up, the

laser will be disabled and the set wavelength will be cleared. Once the Tx_DIS is de-

asserted, the firmware will maintain the laser in an off state until the host sets the desired

ITU channel. If the module is powered-down before the ITU channel was set and

TX_DIS de-asserted, the module will re-start at the default channel. See the following

startup channel flowchart.

Flow Chart of Startup Channel

A desired wavelength can be commanded by the user by writing into Bytes 72 (MSB)

and 73 (LSB). Wavelength control command:

Address

Bit

Name

Description

72 (MSB) & 73

(LSB)

All

Wavelength Set

User input of Wavelength set point (in

units of 50 pm)

74 (MSB) & 75

(LSB)

All

Wavelength

Error

Monitor of Current Wavelength Error (in

units of 5 pm)

Thus for instance a target wavelength of 1556.55 nm would correspond to 79h (MSB)

written to Byte address 72 and 9Bh (LSB) written to Byte address 73. Alternatively a

desired frequency channel can be commanded by the user by writing into Bytes 112

(MSB) and 113 (LSB).