Electro-optic Modulators

Feb 12,2021
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Data Sheet

List of EO Modulators Drivers Phase Modulator Intensity Modulator Driver 1. Electro-optic Intensity Modulator The STK-KY-AM series electro-optic intensity modulator utilizes the electro-optical effect of lithium niobate and push-pull Mach-Zehnder inte

List of EO Modulators & Drivers

Phase Modulator
Intensity Modulator
Driver

1. Electro-optic Intensity Modulator

The STK-KY-AM series electro-optic intensity modulator utilizes the electro-optical effect of lithium niobate and push-pull Mach-Zehnder interference structure to achieve intensity modulation of optical signals. It features low insertion loss, high modulation bandwidth, high extinction ratio, low half-wave voltage and high damage optical power. This product is mainly used for electro-optical signal conversion in high-speed optical fiber communication systems, the generation of light sidebands, high extinction ratio light pulse generation in quantum communication, microwave fiber link and other fields.

Key Features

Wavelengths optional
Low half-wave voltage
High bandwidth
Low insertion loss

Applications

High-speed optical fiber communication systems
Microwave fiber link
Quantum communication

Parameters	Symbol	STK-KY-AM-08	STK-KY-AM-10	STK-KY-AM-15-10G	STK-KY-AM-15-20G
Wavelength		830±40	1064±60	1550±100nm	155±100nm
Insertion loss	IL	<5 dB	<4 dB	<4 dB	<4.5 dB
Optical return loss	ORL	-40 dB	-45 dB	-45dB	-45dB
Bandwidth (-3dB)	S21	2.5GHz	10GHz-	10GHz	20GHz
Rise time 10%~90%	tr	150ps	35ps	35ps	18ps
Half-wave voltage @50KHz, RF	Vπ	5V	4.5V	4V	5V
Half wave voltage @Bias	Vπ	6V	6V	5V	5V
Extinction ratio	ER	28dB	30dB	>25dB	>25dB
Input resistance	ZRF	50 @RF, 1M @Bias
Electrical interface		SMA(f)			K(f)
Electrical return loss	S11	<-10dB
Input fiber		PM Panda slow axis alignment
Output fiber		Single mode fiber or PM fiber
Fiber connector		FC/APC or customer specified
Operating temperature	Top	-10~60C
Storage temperature	Tst	-40~80C
RF input power	Pi	<28dBm
Max. input optical power	Po	30mW	50mW	100mW	100mW

1.1 1064nm High Extinction Ratio Electro-optic Intensity Modulator STK-KY-AM-10

Key Features

1064nm Operation
Low insertion loss
3dB bandwidth 5GHz
Low half-wave voltage
High Extinction Ratio >50dB

Applications

Optical Pulse Generation
Optical fiber sensing system
Laser mode locking

The 1064nm high extinction ratio electro-optical intensity modulator integrates two Mach-Zehnder intensity modulators with a push-pull structure, which can achieve an extinction ratio of up to 50dB. It is used in the fields of high-speed optical pulse generation, fiber sensing, and laser mode locking.

Block diagram

Parameters			Symbol	Min.	Typ.	Max.	Unit
Optical Parameters
Cystal				LiNbO3 X-Cut Y-Prop
Waveguide process				APE
Wavelength				980	1064	1100	nm
Insertion loss*			IL		7	8	dB
Optical return loss			ORL			-40	dB
Extinction ratio @DC			ER@DC	50			dB
Polarization extinction ratio*			PER	25	28		dB
Fiber	Input			Panda PM 980
Fiber	Output			Panda PM 980
Fiber connector				FC/PC、FC/APC or user specified
Electrical Parameters
Bandwidth（-3dB）			S21	5			GHz
Half-wave voltage Vpi		RF1 & RF2	Vπ@50KHz		4.5	5	V
Half-wave voltage Vpi		Bias1 & Bias2	Vπ@Bias		4	5	V
Electrical return loss			S11		-12	-10	dB
Input impedance		RF1 & RF2	ZRF	50
Input impedance		Bias1 & Bias2	ZBIAS	1M
Electrical connector		RF1 & RF2		SMA(f)
Electrical connector		Bias1 & Bias2		4pin

*with connector

Absolute Maximum Ratings

Parameters	Symbol	Unit	Min.	Typ.	Max.
Input optical power	Pin,Max	dBm			10
RF input power		dBm			28
Bias voltage	Vbias	V	-15		15
Operating temperature	Top	ºC	-10		60
Storage temperature	Tst	ºC	-40		85
Humidity	RH	%	5		90
Dimension		mm		111x12.5x9

Ordering Information

STK-KY-AM-10-BW-PP-FA/FP-HER
WL—Wavelength: 10-1064nm
BW—Bandwidth: 5G---5GHz
FA/FP—Connector: FA---FC/APC; FP---FC/PC

1.2 1550nm High Extinction Ratio Electro-optic Intensity Modulator

Key Features

C and L-Band Operation
Low insertion loss
3dB bandwidth 10GHz
Extinction ratio 35/40dB
Low half-wave voltage
Integrated Monitor Photodiode
Telecordia GR-468-CORE

Applications

Microwave fiber link
Quantum communication
Optical pulse generation
Optical fiber sensing system
Laser mode locking

The 1550nm High Extinction Ratio LiNbO3 electro-optical intensity modulator based on the M-Z push-pull structure has a low half-wave voltage and stable physical and chemical characteristics, and the device has a high response rate, high extinction ratio(>40dB) and is therefore widely used in microwave fiber link, Quantum communication, optical Q-switched systems, laser mode-locking, and fiber sensing .

Schematic diagram

Parameters		Symbol	Min.	Typ.	Max.	Unit
Optical Parameters
Wavelength			1525		1565	nm
Insertion loss(with connector)		IL		4	5	dB
Optical return loss		ORL			-45	dB
Extinction ratio @DC		ER@DC	35	40		dB
Fiber	Input		Panda PM Fujikura SM 15-P-8/125-UV/UV-400
Fiber	Output		Panda PM Fujikura SM 15-P-8/125-UV/UV-400
Fiber interface			FC/PC、FC/APC or user specified
Electrical Parameters
Bandwidth（-3dB）		S21	10	12		GHz
Rise time (10%~90%)		Tr	35			ps
Half-wave voltage Vpi	RF	Vπ@50KHz			5	V
Half-wave voltage Vpi	Bias	Vπ@Bias			6	V
Electrical return loss		S11		-12	-10	dB
Photodiode Responsivity		RP	10-3			A/W
Input impedance	RF	ZRF	50
Input impedance	Bias	ZBIAS	1M
Electrical interface			SMA(f)
Dimension			111x12.5x9			mm

Absolute Maximum Ratings

Parameters	Symbol	Unit	Min.	Typ.	Max.
Input optical power	Pin,Max	dBm			20
RF input power		dBm			28
Bias voltage	Vbias	V	-20		20
Operating temperature	Top	ºC	-10		60
Storage temperature	Tst	ºC	-40		85
Humidity	RH	%	5		90

Characteristic Curve

Ordering Information: STK-KY-AM-WL-BW-PP-FA/FP-ER

WL—Wavelength：15-1550nm
BW—Bandwidth：10G---10GHz 20G-20GHz
FA/FP—Connector：FA---FC/APC; FP---FC/PC
ER----Extinction Ratio: 35dB, 40dB

1.3 10GB 1550nm All-in-one Electro-optic Modulator STK-MU-15-NRZ

We can provide with the driver for the above electro-modulators and integrate the modulator, amplifier and relevant controllers together. The user can manually or automatically set the bias points. At the manual setting mode, the bias can be displayed and the EO modulator and amplifier individually operate. At the automatic setting mode, the user can set various bias points according to the demand and the bias point is locked and displayed. The modulation performance of the modulator is not influenced by external factors such as environment temperature and vibration.

		Symbol	Min	Typical	Max	Unit
Optical parameters
Wavelength		l	1520	1550	1610	nm
Crystal			LiNbO3
Insertion loss	@Peak	IL		4.5	5.5	dB
Insertion loss	@Q	IL		7	8	dB
Optical return loss		ORL			-45	dB
Extinction ratio @DC		ER@DC	25	28		dB
Fiber	Input		Panda PM Fujikura SM 15-P-8/125-UV/UV-400
Fiber	Output		Corning SMF-28
Electrical parameters
Bandwidth (-3dB)		S21	10	12		GHz
Working speed			10K		12.5G	bps
Input signal format				NRZ
Input signal amplitude		Vi	0.25	0.4	0.8	Vpp
Half-wave voltage @10Gbps		Vπ	4.5	5.0		V
Dynamic extinction ratio@10Gbps NRZ		DER	12			dB
Rise time (10%-90%)		Tr	30	35		ps
Additional vibration*		JitterRMS	1.1	1.7	2.0	ps
Amplification gain		G	0		25	dB
Loss from waves		S11		-12	-10	dB
Input impedance @RF input		ZRF		50		W
Manual setting mode
Bias voltage		Vbias	-10		10	V
Adj. accuracy				0.1		V
Automatic setting mode
Bias			Null, Q+/-, Peak
Vibration period		F		1		KHz
Vibration amplitude		Vpp		2%Vπ
Harmonic extinction ratio			40	50		dB
Optical power stability		DP			0.1	dB
Duty			45		55	%
Other parameters
Input interface			SMA(f)
Optical interface	Input		FC/APC PM
Optical interface	Output		FC/APC SM
Input power		VDC	AC 220			V
Dimension		LxWxH	270x300x90			mm
Weight			<5			kg
Port			RS232
Display contents	Manual		Amplification gain, real-time bias voltage
Display contents	Automatic		Amplification gain, bias Vpi, real-time bias voltage, bias lock status

Ordering Information: STK-MU-W-XX-BW-FB-YY-M/A

W: wavelength such as 15-1550nm, 13-1310nm, 10-1064nm
XX: modulation method such as NRZ, DPSK, DQPSK, DPQPSK, AN, PM
BW: bandwidth such as 02-2.5G, 10-10G, 20-20G, 40-40G
FB: input/output fiber type such as PP (input & output are PM), PS (input is PM and output is SM)
YY: fiber connector such as FA-FC/APC, FP-FC/PC
M/A: control mode, M is manual and A is automatic.

2. Electro-optic Phase Modulator

The STK-KY-PM series electro-optic phase modulator utilizes the electro-optical effect of lithium niobate to achieve phase modulation of optical signals, and uses titanium diffusion or proton exchange process to fabricate optical waveguides, which can achieve dual-polarization or single-polarization phase modulation. It has low insertion loss, high modulation bandwidth, low half-wave voltage, high damage optical power, etc. This product is mainly used for optical chirp control in high-speed optical communication systems, phase delay in coherent communication systems, the generation of optical sidebands, phase modulation in quantum communication, reducing stimulated Brillouin scattering (SBS) in analog optical fiber communication systems and other fields.

Key Features

Wavelengths optional
Low half-wave voltage
Low insertion loss
High damage optical power

Applications

Optical fiber sensing systems
Optical fiber communication
Laser coherent synthesis
Phase delay (movement)
Quantum communication

Parameters	Symbol	STK-KY-PM830-1	STK-KY-PM1064-1	STK-KY-PM1550-1	STK-KY-PM1550-2
Wavelength		830+/-40	1064+/-60	1550+/-50nm
Insertion loss	IL	<5 dB	<4 dB	<4 dB	4 dB
Optical return loss	ORL	-40 dB	-45 dB	-45dB	-40 dB
Bandwidth (-3dB)	S21	2.5GHz	10GHz-	300MHz	10GHz
Rise time 10%~90%	tr	150ps	35ps	1ns	35ps
Vpi@50KHz	Vπ	5V	4.5V	4V	4V
Input resistance	ZRF	50		1M	50
Electrical interface		SMA(f)		3pin	SMA(f)
Electrical return loss	S11	<-10dB
Input/output fiber		PM Panda slow axis alignment
Fiber connector		FC/APC or customer specified
Operating temperature	Top	-10~60C
Storage temperature	Tst	-40~80C
RF input power	Pi	<28dBm
Maximum input optical power	Po	30mW	100mW	100mW	100mW

2.1 1550nm Optical CS-SSB Modulation Modules

The STK-KY-MU-SSB-15 series product is an optical CS-SSB modulation module developed by our company. The modulation module integrates Mach-Zehnder dual parallel modulators, bias point control circuits, 90 degree hybrid splitter, can achieve stable and reliable single sideband modulation, and can switch between left and right sideband control as needed. This product is mainly used in Brillouin fiber sensing systems, microwave photonics, gas detection and other fields.

Key Features

Wavelength C-band
Sideband suppression ratio:>30dB
Carrier suppression ratio: >26dB
Up and down sidebands
Convenient to use and reliable

Applications

Optical fiber sensing system
Microwave photonics
Gas detection
Optical fiber communication systems

Parameters	Symbol	Min.	Typ.	Max.	Unit
Carrier Optical Source Parameters (Provided by the user)
Laser type	DFB source or wavelength tunable source
Wavelength	l	1510		1560	nm
Line width	Dn	-		1	MHz
Polarization extinction ratio	PER		20	-	dB
Power	Pi		10	100	mW
Modulator Specification Parameters
Modulator type	X-cut double parallel M-Z modulator
Modulator bandwidth S21@3dB	BW	10	12	-	GHz
Insertion loss	IL		7	8	dB
Return loss	RL	-45	-50	-	dB
Bias Controller Parameters
Automatic feedback bias controller		Jitter mode
Jitter signal frequency		400	1000	1400	Hz
Jitter signal amplitude		10	50	1000	mV
Preset work point		Lowest point
CS-SSB Optical Output Signal
Single sideband modulation range*	F	1		12	GHz
Input RF power	PRF	-5		5	dBm
Sideband suppression ratio @1550nm		30	35	-	dB
Carrier suppression ratio @1550nm		26		32	dB
Interface
Input fiber		Panda type polarization-maintaining fiber
Output fiber		Panda type polarization-maintaining fiber
Fiber optic interface		PM FC/APC Slow axis alignment
Input RF signal interface		SMA（50Ω）
Bias controller communication interface		J30J
Other Parameters
Operating temperature	To	+15	-	+35	ºC
Stored temperature	Ts	-40	-	+75	ºC
Power supply	V	-	15	-	V
Module size	LWH	16012520 mm
Weight		-	0.3	-	Kg

3. Drive Module for Electro-optic Modulator

Key Features

10G, 20G, 40GHz optional bandwidth
Gain> 25dB
Saturated output Max.25dBm (11Vpp)
Rise time Min.<8ps
Low jitter
DC12V power supply
Easy to use

Applications

High-speed optical fiber communication system
Quantum communication
Picosecond pulse amplification
Optical fiber sensing system

Product List

10G driver module
10G high output driver module
20G driver module
40G driver module

The STK-KY-MD-XX series electro-optic modulator driver is a broadband, high-output driver amplifier mainly used for lithium niobate electro-optical intensity and phase modulator. Its working bandwidth is up to 30K ~ 40GHz, and it can achieve a maximum of 42Gbps NRZ wideband signal amplification up to 8Vpp. It is mainly used in high-speed optical fiber communication systems, quantum communication, picosecond pulse amplification, and optical fiber sensing systems.

Parameters	Symbol	Unit	STK-KY-MD-10G	STK-KY-MD-10G-HO		STK-KY-MD-20G	STK-KY-MD-40G
Bandwidth（-3dB）	S21-High	GHz	>10	>8		>20	>35
Bandwidth（-3dB）	S21-Low	KHz	30	100		30	30
Data rate		bps	100k~12.5G	100k~10G		100k~25G	100k~42G
Gain	G	dB	>26	>30		>28	>28
Gain ripple	DG	dB	<3	<3		<3	<3
Output amplitude	Vout	Vpp	8	11		8	8
Saturated output power	Ps	dBm	23	25		23	23
Rise time (10% -90%)	Tr	ps	35	40		18	8
Jitter	JitterRMS	ps	<2	<2		<1	<1
Isolation	S12	dB	<-40
Electrical return loss	S11	dB	<-12	<-10		<-10	<-10
RF connector			SMA(f)			K(f)
Operating Voltage	VDC	V			DC 12V
Working current	Io	mA			<500
Dimensions	LxWxH	mm			50x33x15

Absolute Maximum Ratings

Parameters	Symbol	Unit	Min.	Typ.	Max.
Input signal amplitude	Vin	Vpp			1.5
Operating Voltage	DC	V	11.5		13
Operating temperature	Top	ºC	-20		60
Storage temperature	Tst	ºC	-40		85

Characteristic Curve

Typical Application

4. STM Series Electro-optic Modulators

E-O modulators and modulation systems are used for pulse selection, regen-switching, video disk mastering and data recording. Products include E-O phase modulators, beam deflectors, associated drivers, transverse field modulators, laser noise-reduction systems, and optical isolators. We also manufacture, on a custom basis, intensity modulation systems with high frequency capabilities beyond 400MHz.

Most modulators are transverse field type Pockels Cells. In the original Pockels Cell design the optical beam is longitudinal to the electric field. In the new transverse design the optical beam is orthogonal to the electric field. The advantage of the transverse design is that it requires approximately 100 volts as opposed to the kilovolts required by the original design.

Features

2 or 4 crystal configurations
Designed to minimize the natural net birefringence
Require DC offset voltage to set the quiescent operating point
Supplied with an output polarizer, pre-aligned to the crystal axes
Require either that the input laser is polarized or use of an auxiliary polarizer at the input
Filled with index matching fluid < /li> Note: Window assemblies should not be removed

Configurations

ADP Crystal Series Wavelength Limits (240 to 800 nm)*

Model Number	V ½ wave @ 500nm	V ½ wave @ 830nm	Aperture Diameter	Resonances	Contrast Ratio @ 633nm	Length w/ Polarizer
STM370	184	306	2.5mm	No	500:1	158mm
STM370 LA	263	437	3.5mm	No	500:1	158mm
STM380	92	153	2.5mm	No	500:1	253mm
STM390	115	190	3.5mm	No	500:1	272mm

KDP Crystal Series Wavelength Limits (240 to 1100nm)

Model Number	V ½ wave @ 500nm	V ½ wave @ 830nm	V ½ wave @ 1064nm	Aperture Diameter	Resonances	Contrast Ratio @ 633nm & 1064nm	Length w/ Polarizer
STM350-50	455	757	970	3.1mm	Yes	500:1,700:1	106mm
STM350-80	261	433	522	2.7mm	Yes	500:1,700:1	137mm
STM350-80LA	360	600	720	3.5mm	Yes	500:1,700:1	137mm
STM350-105	226	376	472	3.1mm	Yes	500:1,700:1	162mm
STM350-160	130	216	275	2.7mm	yes	300:1,500:1	215mm
STM350-210	113	188	240	3.1mm	Yes	300:1,500:1	268mm

LTA Crystal Series Wavelength Limits (700 to 2000nm)

Model Number	V ½ wave @ 830nm	V ½ wave @ 1064nm	V ½ wave @ 2500nm	Aperture Diameter	Resonances	Contrast Ratio @ 1064nm	Length w/ Polarizer
STM360-40	213	400	950	2.7mm	Yes	200:1	95mm
STM360-80	143	183	430	2.7mm	Yes	100:1	137mm
STM360-120	107	138	323	2.7mm	Yes	100:1	174mm
STM360-160	71	92	215	2.7mm	Yes	100:1	215mm

Amplifier Details

Model	Bandwidth	Rise/Fall Times	Max. Output V	Typical Drive Configuration	Output
ST25A	DC-to-25MHz	14ns	145	100 Ohms B.L.	Linear
ST25D	DC-to-30MHz	8ns	175	100 Ohms B.L.	Digital
ST50	DC-to-50MHz	7ns	90	50 Ohms B.L.	Linear
ST100	DC-to-100MHz	3.5ns	90	50 Ohms B.L.	Linear
ST200	10Khz-to-200MHz	2ns	170	50 Ohms S.E.	--
ST275	DC-to-8MHz	50ns	275	Lumped Capacitance	Linear
ST302RM	DC-to-250KHz	1 micro-sec	750	Lumped Capacitance	Linear
ST302A	DC-to-1MHz	350ns	350	Lumped Capacitance	Linear
ST307	DC-to-50KHz	8ns	800	Lumped Capacitance	Digital
ST505	5MHz-to-100MHz	3.5ns	44	50 Ohms S.E.	--
ST550	20MHz-to-500MHz	1.5ns	140	50 Ohms S.E.	--