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Specifications Supplementary Performance Characteristics
54 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,
Sixth Edition
Supplementary Performance
Characteristics
Operating Modes
Internal Digital Modulation
1
50% duty cycle, 200 Hz to 300 kHz. Modulation output: TTL reference
signal.
1
Agilent 81480A, Agilent 81680A/40A/82/42A: displayed wavelength
represents average wavelength while digital modulation is active.
External Digital Modulation
1
> 45% duty cycle, fall time < 300 ns, 200 Hz to 1 MHz. Modulation input:
TTL signal.
External Analog Modulation
1
≤ 15% modulation depth, 5 kHz to 20 MHz.
Modulation input: 5 Vp-p.
External Wavelength Locking (Agilent 81480A, Agilent
81680A/40A/82A/42A)
> ±70 pm at 10 Hz
>
±7 pm at 100 Hz
Modulation input:
±5 V
Coherence Control (Agilent 81480A, Agilent
81680A/40A/82A/42A)
For measurements on components with 2-meter long patchcords and connectors
with 14 dB return loss, the effective linewidth results in a typical power stabil-
ity of <
±0.025 dB over 1 minute by drastically reducing interference effects in
the test setup.