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Coherence Control, Internal Modulation All the DWDM series laser modules provide an adjustable coherence length control. For high precision power measurement the narrow linewidth of a DFB laser can lead to coherent interference effects caused by reflections from the multiple surfaces that are present in most optical systems. These multiple reflections, while extremely small, can add coherently. The long coherence length of a DFB laser can lead to significant errors when making high precision power measurements.

Laser & ASE Systems

DWDM Laser Sources for TXP Platform

Tunable Lasers Femtosecond Laser WDM Laser Sources Benchtop Laser Sources HeNe Lasers ASE Sources A small signal modulation on the laser current is used to broaden the DFB laserlinewidth from about a few MHz to more than 1GHz. The LS5000 providescontinuous adjustment of the linewidth over this entire range. An internal sinewave/square wavegenerator is used to modulate the laser current. Using these features a discrete spectral distribution is generated. Brillouin scattering is another effect that can lead to significant errors when makingoptical power measurements in fiber based systems. The magnitude of the error can be reduced by increasing the linewidth of the source.With the internal, freely running, function generator thelaser power can be modulated between 20Hz and 20kHz.
TXP5016 CHASSIS WITH LS5000 MODULES

LS5000 DWDM Laser ModulesWavelength

â–  Options: 600 points: S, C, and L-Band
â–  External Analog LF Modulation DC to 50kHz(option) For applications where a precise LF modulationup to 50kHz is required, the DWDM modules are availablewith an LF modulation option. With this option, theoutput power can be modulated via an optional SMA input. The laser remains fully protected due to a precise limit circuit in the module. Tuning Range: ±1nm Precision Wavelength Tuning
â–  Accuracy: ±0.025nm, typ.
â–  Stability typ.:
â–  Resolution: 1pm
â–  Laser Linewidth:

Output Power:

â–  Options: 10mW, 20mW

Tools of the trade - Vol 18 - 36188 TXP TUNABLELASER MODULE

â–  Accuracy (abs/rel): 0.6dB/0.4dB
â–  Stability:
â–  â–  Attenuation: 10dB (ContinuouslyVariable) Mode Hop Free
â–  Smooth and Truly Continuous Tuning
â–  Resolution: 0.01dB
â–  1519 to 1630nm Tuning Range
â–  Side Mode Suppression Ratio:
â–  Sweep and Step Mode Operation > 45dB typ. (> 40dB Min) –145dB/Hz typ.
â–  High Output Power
â–  Relative Intensity Noise (RIN):

See Page 487for Details

â–  Optical Isolation: > 35dB
ECL5000D TXPMODULE

Coherence Control (StandardFeature, All Models)

â–  Linewidth: Up to 1 GHz (Adjustable)
â–  Shape: Noise, Sine & Square (Triangle upon request)
â–  Frequency: 0.02 to up to 20kHz
â–  Modulation depth: 0.1 to 100%

Modulation

â–  Analog LF Modulation: DC-50kHz (option)

Ordering InformationLS5-X-XXX-XX-NM General Data

ITU GRID COLUMN(A, B, C OR D) â–  Optical output: FC/APC Connector For informationabout the ITU gridand availablewavelengths see page 500 to 501.
â–  Fiber: SMF-28 or Equivalent
â–  Operating temperature: 0 to +35ËšC
â–  Storing temperature: -40 to +60ËšC
CHANNELCODE (01...50) â–  Warm-up Time: 15 minfor Rated Accuracy
10 (10mW)20 (20mW) S/C/L BAND â–  Laser Module Width: 1 Slot
All data vilid at 23±5ºC and 45±relative humidity Example: LS5-C-09B-10: C-band source, Channel 9 in the 50GHz ITU “B” Grid (1522.95nm), 10mW.
ITEM$£ ¥DESCRIPTION LS5-X-XXX-10-NM $2,400.00£1,333.33 2.000,00¥320,000WDM Laser Source 10 mW, no direct modulationLS5-X-XXX-20-NM $2,700.00£1,500.00 2.250,00¥360,000WDM Laser Source 20 mW, no direct modulation Sales: 973-579-7227
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