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  • Setting K-Clock Delay
  • Switching Configurations
  • Operating a Variable Delay Line (VDL)

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  1. Reference Manuals
  2. SS-OCT Laser Engine

Advanced Laser Engine Features

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Last updated 2 years ago

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Setting K-Clock Delay

The k-clock delay can be adjusted depending on the length of the fiber used between the engine and the balanced receiver. The k-clock delay can be adjusted between 28.285 ns and 65.58 ns in 0.575 ns intervals (Refer to the section for detailed instructions on how to set the clock delay).

Selection of the appropriate delay is dependent on the length of fiber used between the balanced receiver and the Engine. An example detailed drawing of the system configuration is shown below.

The orange plus red path should be matched to the green path plus the electronic delay to achieve transform limited signal reconstruction. To best make use of the full electronic delay, it is best to match the red plus orange paths to the green path plus the mid electronic delay.

28 ns correspond to 8394 mm in air or 5721 mm in fiber. 64 ns correspond to 19186 mm in air or 13078 mm in fiber. Mid range is 9400 mm in fiber.

Example:

(Orange path + Red Path) - Green Path = 13083 mm - 2610 mm = 10473 mm in fiber.

10473 mm in fiber * 1.47 fiber refractive index = 15395 mm in air.

Dividing by speed of light in air: 15.395 m / (299 792 458 m / s) = 51.3 ns

The delay between the clock and the signal is 51.3 ns

Calculating the optical clock delay value that to be set: (51.3 – 28.3) / 0.575 = 40

Switching Configurations

Operating a Variable Delay Line (VDL)

Multiple configurations can be offered with some laser engines. Configurations can vary between dummy clocks ON/OFF and various speeds. These configurations need to be set at the factory or can be done remotely via Tech Support. Refer to section for more details.

Refer to if your Engine includes optional VDL control capabilities.

switching configurations
these instructions
OCT Host k-clock delay