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The Keysight 81609A tunable laser module can step quickly to discrete wavelengths with a resolution of 0.1 pm and a typical wavelength repeatability of ±3 pm, making it ideal for cost-effective testing of broadband optical devices. With wavelength setting times like 300 ms, 3-4 times faster than earlier models, stepped sweeps take much less time. Like the other modules in the family, it delivers more than +12 dBm peak output power with low spontaneous emission levels. At ±0.01 dB power stability over an hour, it can also serve as a static local oscillator with a wide tuning range for receiver testing or transmission experiments.
Specifications.
Wavelength range:
1240 nm to 1380 nm (Option 113),
1450 nm to 1650 nm (Option 216),
1490 nm to 1640 nm (Option 116).
Wavelength resolution:
0.1 pm, 17.5 MHz at 1310 nm (Option 113),
0.1 pm, 12.5 MHz at 1550 nm (Option 116, 216).
Continuous sweep range: Full wavelength range.
Tuning time (typical):
300 ms (1 nm step, max. output power),
1.5 s (100 nm step, max. output power).
Wavelength stability (typical): ≤ ±5 pm, 24 hours.
Linewidth (typical), coherence control off: <10 kHz.
Effective linewidth (typical), coherence control on:
> 50 MHz (1290 nm - 1340 nm) (Option 113),
> 50 MHz (1515 nm - 1620 nm) (Option 116, 216).
Maximum output power (continuous power during sweep):
> +13 dBm peak (typical) (Option 113),
> +12 dBm peak (typical) (Option 116, 216).
Side-mode suppression ratio (typical):
≥ 70 dB (1290 nm - 1340 nm) (Option 113),
≥ 70 dB (1515 nm - 1620 nm) (Option 116, 216).
Relative intensity noise (RIN) (0.1 - 6 GHz):
< -150 dB/Hz (typical, 1290 nm - 1340 nm) (Option 113),
< -150 dB/Hz (typical, 1515 nm - 1620 nm) (Option 116, 216).
Signal to source spontaneous emission ratio:
≥ 75 dB/nm,
≥ 85 dB/0.1 nm.
Signal to total source spontaneous emission ratio: ≥ 70 dB.
Absolute wavelength accuracy:
±20 pm; typ. ±5 pm (Stepped mode),
±10 pm (Continuous sweep mode, both directions (typical)).
Relative wavelength accuracy: ±30 pm; typ. ±10 pm.
Wavelength repeatability: ±15 pm; typ. ±5 pm.
Power repeatability (typical): ±0.01 dB.
Power stability: ±0.01 dB (1 hour), typ. ±0.03 dB (24 hours).
Power linearity: ±0.1 dB.
Power flatness versus wavelength: ±0.25 dB.
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