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Definition of Terms Specifications
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 43
Measurement with optical spectrum analyzer. Tunable laser switched
on and off.
Modulation Frequency Range
The range of frequencies for which the modulation index is above − 3
dB of the highest modulation index. In this context, modulation index
is defined as the AC power amplitude (peak-to-peak) divided by the
average power.
Output Power
The achievable output power for the specified TLS tuning range.
Conditions: temperature within operating temperature range.
Measurement with power meter at the end of a single-mode fiber
patchcord.
Output Isolation
The insertion loss of the built-in isolator in the backward direction.
Measurement: Cannot be measured from the outside. This
characteristic is based on known isolator characteristics.
Peak Power
The highest optical power within specified wavelength range.
Polarization Extinction Ratio
The ratio of optical power in the slow axis of the polarization-
maintaining fiber to optical power in the fast axis within a specified
wavelength range.
Conditions: only applicable for TLS with polarization maintaining
fiber with the TE mode in slow axis and oriented in line with
connector key, at constant power level.
Measurement with a polarization analyzer at the end of a polarization-
maintaining patchcord, by sweeping the wavelength, thereby creating
circular traces on the Poincaré sphere, then calculating the
polarization extinction ratio from the circle diameters.