Butterfly Laser Diode Mounts

Overview
Specs
Pin Diagrams
OEM Modules
Smart Pack
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Features

Laser Diode Mount for 14-Pin Butterfly Packages
Zero Insertion Force (ZIF) Mounting Socket
Type 1, Type 2, Type 2 with Bias-T, and User-Defined Pinout Configurations
LED Indicates When Laser is Enabled

The LM14S2 Universal 14-Pin Butterfly Laser Diode Mount is designed for use with lasers, optical amplifiers, and two-port electro-optic devices in a 14-pin type 1, 2, or 2 with bias-T butterfly package. The top surface has heat sink fins and a recessed region to mount the laser diode, resulting in a low profile package with a temperature coefficient of 3 °C/W. The LM14S2 also includes a laser diode TEC lockout feature^a that disables the laser when the TEC controller is not active. The LM14S2 supports maximum laser and TEC currents of 5 A each. In order to utilize the TEC controller, the laser must have an integrated thermoelectric cooler (TEC) or thermistor sensors. This mount also features a zero insertion force (ZIF) socket, a remote safety interlock connection, and an LED to indicate that the laser diode is enabled.

The LM14S2 eliminates the restriction of fixed-pin configuration mounts by using exchangeable configuration cards that plug into a connector located on the bottom of the mount. Included with the LM14S2 is a card that provides compatibility with both type 1 pump laser diodes and type 2 telecom laser diodes. For the pin diagrams that correspond to these types, please refer to the Pin Diagrams tab. In addition, a second card (Item # LM14S2-UA) is also included. The LM14S2-UA is a user-configurable card designed to allow custom wiring of the mount. Additional LM14S2-UA user-configurable cards are available separately. Please note that even with an LM14S2-UA, only anode-grounded diodes can be used with the LM14S2 butterfly laser mount.

In addition to the configurable pinout feature, a bias-T adapter is included, allowing for RF modulation of butterfly lasers specifically designed with this capability. It features a female SMA connector for an RF source up to 500 MHz, and is designed for lasers with a type 2 pin configuration including an internal bias-T and built-in blocking inductor. For more details on the pin assignments, please refer to the Pin Diagrams tab as well as the spec sheet for the specific laser diode to be used. Please note that Thorlabs' butterfly package laser diodes are not compatible with the bias-T adapter.

The LM14S2 is pin-for-pin compatible with all of Thorlabs' benchtop laser diode and TEC controllers, and most of our platform laser and TEC controllers as well, eliminating the need for custom-made interface cables. Thorlabs also manufactures customized, application-specific butterfly mounts for OEM customers. Please see the OEM Modules tab for details.

The TEC lockout feature only functions with Thorlabs' laser and TEC controllers, and can be easily bypassed if not required.

Item #	LM14S2
Maximum Laser Current	5 A
Polarity of Laser Diode	Anode Ground
Polarity of Monitor Diode	Floating
Maximum TEC Current	5 A
Temperature Sensor	Thermistor^a
Temperature Range^b	0 to 70 °C
Temperature Coefficient of Heat Sink	3 °C/W
Dimensions	3.50" x 3.50" x 1.31" (88.9 mm x 88.9 mm x 33.3 mm)
Modulation (Bias-T Adapter) Specifications^c
RF Modulation Frequency	100 kHz to 500 MHz
RF Input Connection	SMA
RF Input Impedance	25 Ω
RF Power (Max)	200 mW or Limit of Laser Diode

At 25 °C with 2 A of TEC current, integrated into the laser package.
This is the temperature range supported by the LM14S2. Installed laser diodes may have different ranges.
The bias-T adapter is only compatible with Type 2 Telecom Laser Diodes (see the Pin Diagrams tab for details).

Laser Diode Connector

D-type Female

DB9 Female

Pin #	Signal
1	Interlock and Status Pin (LDC Specific)
2	Photodiode Cathode PDC
3	Laser Diode Anode LDA
4	Photodiode Anode PDA
5	Interlock and Status Return
6	Laser Diode Voltage (-) VLD(-)
7	Laser Diode Cathode LDC
8	Not Used
9	Laser Diode Voltage (+) VLD(+)

Bias-T Modulation Adapter*

SMA Female

SMA-female

*RF input for modulation with an external source from 100 kHz to 500 MHz.

TEC Connector

D-type Male

DB9 Male

Pin #	Signal
1	TEC Lockout (+)
2	+Thermistor TH+
3	-Thermistor TH_GND
4	TEC (+)
5	TEC (-) and TEC Lockout (-)
6	Not Used
7	Not Used
8	Not Used
9	Not Used

Pin Assignment of the 14-pin Sockets

The included LM14S2-US custom configuration card can be used for any other pin configuration. This card is also available separately below.

Pin to Connector Configuration for Type 1		Pin to Connector Configuration for Type 2		Pin to Connector Configuration for Type 2 with Bias-T
Click to Enlarge		Click to Enlarge		Click to Enlarge
1	TEC Anode	1	Thermistor Ground	1	Thermistor Ground
2	Thermistor	2	Thermistor	2	Thermistor
3	PD Anode^a	3	LD Cathode	3	LD Cathode
4	PD Cathode^a	4	PD Anode	4	PD Anode
5	Thermistor Ground	5	PD Cathode	5	PD Cathode
6	N.C.	6	TEC Anode	6	TEC Anode
7	PD Cathode^a	7	TEC Cathode	7	TEC Cathode
8	PD Anode^a	8	Case	8	Case
9	LD Cathode^b	9	Case	9	Case
10	LD Anode, Ground	10	N.C.	10	N.C.
11	LD Cathode^b	11	LD Anode	11	LD Anode
12	N.C.	12	N.C.	12	Modulation Input^c
13	LD Anode, Ground	13	LD Anode	13	LD Anode
14	TEC Cathode	14	N.C.	14	N.C.

The monitor photodiode may be placed across either pins 7 and 8 or pins 3 and 4. Please refer to the Laser Diode's documents for the specific pin configuration.
The laser diode cathode may be placed at either pin 9 or pin 11. Please refer to the Laser Diode's documents for the specific pin configuration.
When Using the Bias-T Adapter PCB.

Custom Module for Two 14-Pin Butterfly Packages

Click to Enlarge
Custom Module for 14-Pin Butterfly Packages

Thorlabs OEM Manufacturing

In addition to manufacturing a wide variety of active optical devices, Thorlabs is equipped to deliver customized laser diode, superluminescent diode, and semiconductor optical amplifier modules in OEM quantities. For example, the module shown to the right provides temperature and current control for two superluminescent diodes (SLDs) from an SPI interface. Because this module is designed for standard 14-pin butterfly packages, it is easily adapted for combinations of other optical devices, such as a pigtailed semiconductor laser with an optical amplifier.

As a manufacturer of III-V semiconductor devices, MEMS-VCSEL lasers, quantum cascade lasers, lithium niobate optical modulators, and other devices, we are intimately familiar with the operating requirements of driving lasers and related components. Please visit this webpage for an overview of our laser manufacturing facility, or contact us directly to discuss your application's needs.

Click to Enlarge
LM14S2 Packaging

Smart Pack

Item #	% Weight Reduction	CO₂-Equivalent Reduction^a
LM14S2	21.52%	30.10 kg

Smart Pack

Reduce Weight of Packaging Materials
Increase Usage of Recyclable Packing Materials
Improve Packing Integrity
Decrease Shipping Costs

Thorlabs' Smart Pack Initiative is aimed at waste minimization while still maintaining adequate protection for our products. By eliminating any unnecessary packaging, implementing packaging design changes, and utilizing eco-friendly packaging materials for our customers when possible, this initiative seeks to improve the environmental impact of our product packaging. Products listed above are now shipped in re-engineered packaging that minimizes the weight and the use of non-recyclable materials.^b As we move through our product line, we will indicate re-engineered packages with our Smart Pack logo.

Travel-based emissions reduction calculations are estimated based on the total weight reduction of packaging materials used for all of 2013’s product sales, traveling 1,000 miles on an airplane, to provide general understanding of the impact of packaging material reduction. Calculations were made using the EPA’s shipping emissions values for different modes of transport.
Some Smart Pack products may show a negative weight reduction percentage as the substitution of greener packaging materials, such as the Greenwrap, at times slightly increases the weight of the product packaging.

Posted Comments:

Wieslaw Jasiewicz (posted 2020-11-14 10:23:38.04)

Hi, I can not find main PCB wiring and parts (U1) specification within LM14S2 documents.Would it be possible to get it as it is necessary for our application? Regards Wieslaw

asundararaj (posted 2020-11-17 08:24:02.0)

Thank you for contacting Thorlabs. The PCB design and circuitry are considered proprietary and typically, we are not able to share this. I will reach out to you directly regarding your application.

Ashwin Vijayasai (posted 2020-02-27 04:55:08.153)

Do you have a Butterfly Laser Diode Mount version where external case temperature can be controlled. Newport has one item that can control external case temp. from -5C to 85C. LDM-4984T https://www.newport.com/f/telecom-laser-diode-mounts

asundararaj (posted 2020-02-27 04:12:04.0)

Thank you for your feedback. At the moment, we do not have a butterfly laser diode mount with external case temperature control. I have added this idea to our internal product forum for discussion to offer this at a future time.

Matthew Majewski (posted 2019-09-26 22:07:42.733)

Hello, I understand that the bias-T adapter supplied will only work with diodes that have the correct internal circuity, but my question is if it would be possible to use your laser diode bias-T PCB component to externally wire up a modulation input for other diode types?

asundararaj (posted 2019-10-02 11:05:27.0)

Thank you for your Feedback. To use the Bias-T adapter with other configurations of diodes in a Butterfly package, you can manually configure the LM14S2-UA to suit the pin configurations of your diode.

HYUNJONG CHOI (posted 2019-08-27 17:56:47.8)

Nice to meet you. I'm try to find the evaluation board of thorlabs CW laser "SFL1550P". In the manual of SFL1550P, LM14S2 will be used for mounting the laser SFL1550P. Is it mean that LM14S2 can be used for the evaluation board of SFL1550P? Please reply. Thank you Your sincerely, Choi

YLohia (posted 2019-08-27 09:25:51.0)

Hello Choi, thank you for contacting Thorlabs. The LM14S2 is intended to serve as a proper mount for butterfly laser diodes and can be used for nominal testing of the SFL1550P. I have reached out to you directly to gather more details about your application and requirements.

bsvikram (posted 2017-05-23 01:24:29.873)

Hi, We want to use bias-t to modulate the current of a type -1 diode (SFL 1550S). But the manual says that the bias tee is for type-2 diodes only. How can we modulate type -1 diodes at high frequencies. We also have CLD 1015, but it is also limited in modulation frequency range.

nbayconich (posted 2017-06-09 09:33:29.0)

Thank you for contacting Thorlabs. The bias-T adapter in the LM14S2 is only compatible with Type 2 Telecom Laser Diodes. Type 2 telecom butterfly diodes are designed specifically to be modulated by a bias-T RF circuit. The type 1 butterfly diode packages do not have the proper circuitry in order to be modulated in a bias-T circuit. Some alternative options to modulate your Type butterfly diodes at higher frequencies is to use an external modulating source such as a LiNbO3 EO modulator which can modulate up to 40 Gb/s . Several of our Laser Diode current drivers can directly modulate the type 1 butterfly diode mounts through the LM14S2. For example the ITC series controllers can directly modulate from DC to 150Khz. A Techsupport representative will contact you directly with more information.

savin.saju (posted 2017-03-07 21:59:26.173)

dear Sir , LM14S2 is used for 14 pin butterfly package. Currently, there are 10 pin butterfly package laser. Do you have laser mount for 10-pin butterfly package??? please reply

jlow (posted 2017-03-08 09:01:37.0)

Response from Jeremy at Thorlabs: We do not currently have a 10-pin butterfly mount. I will contact you regarding a custom solution.

schdingo (posted 2014-11-18 15:00:38.487)

Dear Sir or Madam, what is the maximum heat capacity of the LM14S2? Sincerely

jlow (posted 2014-12-10 05:07:40.0)

Response from Jeremy at Thorlabs: We do not have a spec on the maximum heat capacity but it is estimated to be around a few W. We will contact you directly to discuss more about suitability of the mount with your application.

emsia (posted 2013-11-19 10:52:41.403)

Dear Sir/Madam, I am using ILX LDC to control my laser mounted on LM14S2. Everything works perfectly except when the laser is on, the LED does not turn on. The intelock is on bypass mode. The pin 1 os LD is connected to intrlk of the ILX LDC and pin 5 to the ground. any suggestions would be appreciated. Thank you

jlow (posted 2013-11-19 09:23:30.0)

Response from Jeremy at Thorlabs: The LED indicator needs a certain amount of current (5-10mA) to turn on. We will get in touch with you directly to troubleshoot this.

thomas.chassagne (posted 2013-07-02 15:29:14.367)

Hi, I would like to use the LM14S2 with the TED200 TEC controller and an external electronic board that command the bias current. In order to disable the Status and the Interlock function, Should I switch the TEC Lock button to "Bypass" ? In the Operating Manual, it's said that a resistor should be used to limit the curent into the PIN1 to between 5. Thus, if I connect the "driver" side of the resistor to 5V, I should use a 500Ohm resistor and connect the PIN5 to the ground ? Thanks, Thomas

tcohen (posted 2013-07-11 16:20:00.0)

Response from Tim at Thorlabs to Thomas: Thank you for contacting us. Yes, it should be switched to Bypass. You can use that resistance but you may use slightly higher as the current should be limited to a maximum of 10mA.

mlaroton (posted 2013-03-14 10:48:56.47)

Hi, I would like to use the LM14S2 mount with the FLD5F10NP-A Modulator-integrated DFB laser. In this laser, the case ground is the laser cathode. I wonder if I can still use your mount; do I need a non-standard Adapter Card? or does this feature prevents me to use your mount at all? Thanks, Miguel.

tcohen (posted 2013-03-14 13:22:00.0)

Response from Tim at Thorlabs: Physically it appears as if your modulation connection opposite to the pins would interfere with our package designed for a 14pin butterfly. Even if this were to fit however, and a custom configuration card LM14S2-UA was to be used, the LM14S2 is suitable only for anode-grounded diodes.

jjurado (posted 2011-06-15 11:29:00.0)

Response from Javier at Thorlabs to zhemin.cai: Thank you very much for contacting us. We can certainly provide reference drawings that you might be able to use in order to determine whether the LM14S2 will work with your pigtail. Please contact us at techsupport@thorlabs.com, and we will gladly assist you.

zhemin.cai (posted 2011-06-10 06:55:59.0)

Dear Sir/Madam, I am wondering is that possible to get the mechanical drawing for the LM14S2? Becasue we want to use it to hold a long butterfly package, I want to check if it is fit in or not. Cheers. Zhemin.Cai

tor (posted 2011-01-04 14:35:52.0)

Response from Tor at Thorlabs to mhafiz.abakar: Thank you for your interest in our LM14S2. This mount is compatible with our LDC8040 and TED8040 via compatible connector cables, http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=895 . We recommend a CAB400 to connect to the LDC and a CAB420-15 to connect to the TED.

mhafiz.abakar (posted 2010-12-28 21:23:58.0)

Is this laser diode mount suitable to be used with LDC8040 and TED8040 on a pro800 mainframe. thanks.

apalmentieri (posted 2010-02-10 08:58:39.0)

A response from Adam at Thorlabs to serefocal: The LM14S2 is designed to be used with a temperature controller, like the TED200C. It has the ability of controlling the temperature between 0 and 70 degrees C. The temperature coefficient of the heat sink is 3 degreeC/W. I will email you directly to answer any other questions you may have.

serefocal (posted 2010-02-10 10:03:30.0)

Dear Sir/Madam:What is the "LM14S2 Butterfly Laser Diode Mounts"s Heat Dissipation Capacity? May I learn? Thanks...

klee (posted 2009-09-09 10:44:30.0)

A response from Ken at Thorlabs to yuhengc: An applications engineer will contact you directly to discuss about the problem.

yuhengc (posted 2009-09-09 09:24:44.0)

Dear Sir/Madam: We are using LM14S2. Recently we found the current waveform of DFB LD was not stable. The current drive seems to be OK. Since it is new one and I tested with two simulated diode in series. There was no problem. But when I connected to the LD. The current waveform ( monitored from the current feedback)was not constant. Even worst, after a period of fluctuation, it kept decreasing and finally went down to zero. Sometime, if I switched off the driver and powered up again. The current recovered. The LD is the NEL with a little difference layout of pin to type two laser. I am using type 2 configuration card with pin12 connected as the instruction from the manual. What ,do you think, is the reason?

View All »Matching Part Numbers

Butterfly Laser Diode Mounts

Features

Laser Diode Connector

D-type Female

Bias-T Modulation Adapter*

SMA Female

TEC Connector

D-type Male

Pin Assignment of the 14-pin Sockets

Thorlabs OEM Manufacturing

Smart Pack

14-Pin Butterfly Laser Diode Mounts