System and methods for assessing the suitability of analog laser

Details System and methods for assessing the suitability of analog laser System and methods for assessing the suitability of analog laser

1996-03-13

1998-06-16

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359132, 359187, 372 23, 372 29, H04J 1402

Patent

active

057679959

ABSTRACT:
A system and method for predicting the ratio of the strength of the carrier signal to the strength of nonlinear distortion (C/NLD) generated by a communications laser is disclosed. The method jointly evaluates the individual distortion components arising from laser clipping and from inherent laser P-I nonlinearity. According to the method, the laser P-I curve is measured with high precision to quantify the P-I nonlinearity. Various derivatives of the P-I curve are determined and then utilized to calculate C/NLD as a function of a communications network parameter such as the optical modulation index per channel or rms modulation index. Based on this information, the laser can be identified in terms of its sensitivity to RF drive variations in the field. Lasers can be tagged, etc., depending on their C/NLD sensitivity. In this manner, a laser having a C/NLD ratio appropriate for the requirements of a broadband transmission network, such as a SCM CATV system, can be selected and installed in such a system.

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