Language Reference

GRATORDER Select re￿ection order of analyzer's internal di￿raction grating.

Item

Description

 

 

Preset State

AUTO

Wavelength Crossover

900 nm

Example

10 OUTPUT 723;"GRATORDER MAN;" Select only the ￿rst order.

Description Use the GRATORDER command to manually select the ￿rst or second re￿ection order of the optical spectrum analyzer's di￿raction grating. The

di￿raction grating is located in the optical spectrum analyzer's internal monochromator. Normally, the optical spectrum analyzer automatically selects the proper re￿ection order. The following list describes the conditions you can expect:

￿If GRATORDER is set to MAN mode, the analyzer is locked into ￿rst-order di￿raction grating.

￿If GRATORDER is set to AUTO mode, and the stop wavelength is less than 900 nm (RES BW = 10 nm), the analyzer selects ￿rst-order di￿raction grating.

￿If GRATORDER is set to AUTO mode, and the stop wavelength is less than 900 nm (RES BW < 10 nm), the analyzer selects second-order di￿raction grating.

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