THORLABS ULN15 Series User Manual Download Page 12 | Manualshive

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THORLABS ULN15 Series User Manual Download Page 12

Ultra-Low Noise Laser

Chapter 3: Description

Page 10

QTN039956-D02

Figure 8

Tuning of center wavelength as T

FBG

is changed for a T-configuration ULN. The slope of

the linear fit correlates to the device’s temperature-tuning coefficient.

10

20

30

40

50

60

70

1549.8

1549.9

1550.0

1550.1

1550.2

1550.3

1550.4

Center Wavelength
Linear Fit

Wavelength Tuning with FBG Temperature

Cent

er

W

ave

lengt

h (

nm

)

T

FBG

(°C)

Equation: y = a + b*x
Slope: 0.00923 ± 7.73718 E-5

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Summary of Contents for ULN15 Series

Page 1: ...ULN15 Series Ultra Low Noise Lasers User Guide ...

Page 2: ......

Page 3: ...de Hop Free Current Tuning 7 3 2 2 T Configuration Optimized for Longer Range Temperature Tuning 8 3 3 Frequency Noise Characteristics 11 3 4 Intensity Noise Characteristics 12 Chapter 4 Setup 13 4 1 Control Electronics 13 Chapter 5 Operation 15 Chapter 6 Trouble Shooting 16 Chapter 7 Specifications 17 Chapter 8 Mechanical Drawing 18 Chapter 9 Regulatory 19 Chapter 10 Thorlabs Worldwide Contacts 2...

Page 4: ...scription Direct Current Alternating Current Both Direct and Alternating Current Earth Ground Terminal Protective Conductor Terminal Frame or Chassis Terminal Equipotentiality On Supply Off Supply In Position of a Bi Stable Push Control Out Position of a Bi Stable Push Control Caution Risk of Electric Shock Caution Hot Surface Caution Risk of Danger Warning Laser Radiation Caution Spinning Blades ...

Page 5: ...ot comply with the requirements of the U S Code of Federal Regulations title 21 sections 1040 10 and 1040 11 A laser system based on the ULN component is capable of producing sufficient radiation to be classified as a Class IIIb laser Avoid eye or skin exposure WARNING Device emits invisible laser radiation Avoid eye or skin exposure CAUTION The ULN component should be properly mounted to a therma...

Page 6: ...and a photodiode for monitoring the back facet power The ULN15PC and ULN15PT lasers operate in the ITU C band 1530 1565 nm The center wavelength of each device is tested and reported on a serialized data sheet Most devices will operate at or near 1550 nm Customers that require a specific wavelength may contact technical support to place a special order see Chapter 10 ULN lasers are available with ...

Page 7: ...LI behavior is shown in Figure 1 The single mode regions are consistent and stable as long as the device s temperature is adequately controlled The figure also plots the ULN s LI behavior as the current is decreased With decreasing current the device is able to stay in single mode operation within each particular single mode range down to a lower current This hysteresis is characteristic of the UL...

Page 8: ...nges the center wavelength of the FBG s resonant frequency Figure 3 LI plot overlaid with current tuning characteristics Note that the optical spectrum analyzer used in this measurement was set to a sampling resolution of 4 pm the actual tuning is smoother than shown here This is a C configuration device operated at the optimal ΔT which is the difference between TFBG and TCHIP 1548 1549 1550 1551 ...

Page 9: ...and chip temperature TCHIP for each device on its individual datasheet Note that operation with TCHIP 25 C will reduce the device s output power Users wishing to thermally tune the device s wavelength without impacting the output power should therefore select the T configuration The plots in Figure 1 and Figure 3 show a C configuration device operated at the optimal ΔT The multimode operation rang...

Page 10: ...of the single mode ranges can be seen when compared to the C configuration device behavior shown in Figure 1 OSA measurements of the spectrum are shown at various TFBG in Figure 7 The tuning of the center wavelength is shown in Figure 8 It should be noted that the single mode regions do move as TFBG is adjusted as shown in Figure 6 a ULN kept at a single current will therefore not operate single m...

Page 11: ... T configuration ULN spectrum at various TFBG with an operating point above 100 mW Spectra are measured with a 20 pm resolution OSA 450 500 550 600 650 90 100 110 120 130 140 TFBG 25 C TFBG 26 C TFBG 27 C Effect of Changing TFBG Single Mode Power mW Current mA 1548 1549 1550 1551 1552 70 60 50 40 30 20 10 0 10 20 FBG Setpoint 15 C 25 C 35 C 45 C 55 C 65 C Wavelength Change with Temperature Amplitu...

Page 12: ...d for a T configuration ULN The slope of the linear fit correlates to the device s temperature tuning coefficient 10 20 30 40 50 60 70 1549 8 1549 9 1550 0 1550 1 1550 2 1550 3 1550 4 Center Wavelength Linear Fit Wavelength Tuning with FBG Temperature Center Wavelength nm TFBG C Equation y a b x Slope 0 00923 7 73718 E 5 ...

Page 13: ...a ULN at various currents within a single mode region The peak in noise at 43 Hz is due to HVAC systems present in the testing facility The Lorentzian instantaneous linewidth may be estimated from the high frequency white noise level of the noise plot according to Lorentzian linewidth 𝜋 white noise level 2 where the white noise level is measured in hertz sqrt hertz The linewidth at longer integrat...

Page 14: ...f high frequency RIN is shown in Figure 12 this data was taken on a different measurement system with a lower noise floor Figure 11 Low Frequency RIN Measurement Figure 12 High Frequency RIN Measurement Data is typical and obtained from Morton and Morton see section 3 1 for detailed reference 10 1 10 2 10 3 10 4 10 5 10 6 10 7 170 160 150 140 130 120 110 Low Frequency Relative Intensity Noise RIN ...

Page 15: ...ermined by at least two factors the fundamental noise of the laser cavity and the noise of the control electronics The frequency noise spectral density shown in the previous chapter was acquired using low noise control electronics such that the fundamental noise of the laser cavity is the dominant contributor to the noise The shape is characteristic of the frequency noise of semiconductor lasers T...

Page 16: ...port can provide recommendations of suitable circuit designs and suppliers Thorlabs current control instruments are generally not suitable for low noise operation of the ULN Excess noise in the 10 Hz frequency range is typically caused by noisy or unstable temperature control Thorlabs TED200C temperature controllers are suitable for low noise operation of the ULN however users should carefully opt...

Page 17: ... an OSA Small adjustments may be needed to obtain the required performance The ambient temperature has an influence on ULN performance In most laboratory environments single frequency operation will remain unchanged from the test datasheet If the case temperature deviates greatly from 25 C it may be necessary to reset the laser current and or TFBG to find single frequency operation The ULN is sens...

Page 18: ...erialized data sheet check to be sure that the following conditions are met Laser is properly mounted on a suitable heat sink A 55 dB or greater optical isolator is connected to the laser output An ultra low noise current control is used The output fiber connector is undamaged and clean If these conditions are all met and the laser performance is still unacceptable please contact technical support...

Page 19: ...m 1565 nm Lorentzian Linewidtha 100 Hz 250 Hz Output Power CW ICW 100 mW 140 mW Operating Current CW 650 mA 800 mA Threshold Current 50 mA Forward Voltage ICW 3 0 V 4 0 V Side Mode Suppression Ratio ICW 60 dB 70 dB Relative Intensity Noiseb 165 dBc Hz Polarization Extinction Ratio 16 dB 20 dB a At High Current End of Single Mode Range b At Low Current End of Single Mode Range and Measured Above 1 ...

Page 20: ...Ultra Low Noise Laser Chapter 8 Mechanical Drawing Page 18 QTN039956 D02 Chapter 8 Mechanical Drawing ...

Page 21: ...r Thorlabs products such as Pure OEM products that means assemblies to be built into a unit by the user e g OEM laser driver cards Components Mechanics and optics Left over parts of units disassembled by the user PCB s housings etc If you wish to return a Thorlabs unit for waste recovery please contact Thorlabs or your nearest dealer for further information Waste Treatment is Your Own Responsibili...

Page 22: ... USA Canada and South America Thorlabs Inc sales thorlabs com techsupport thorlabs com UK and Ireland Thorlabs Ltd sales uk thorlabs com techsupport uk thorlabs com Europe Thorlabs GmbH europe thorlabs com Scandinavia Thorlabs Sweden AB scandinavia thorlabs com France Thorlabs SAS sales fr thorlabs com Brazil Thorlabs Vendas de Fotônicos Ltda brasil thorlabs com Japan Thorlabs Japan Inc sales thor...

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