Fiber-Coupled AOM

  • Update:Jun 13, 2017
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By virtue of having no moving parts our acousto-optic modulators (AOMs) are able to amplitude modulate a laser beam at very high speed. For example modulation bandwidths in excss of 50MHz are readily achievable.

Product Introduction

By virtue of having no moving parts our acousto-optic modulators (AOMs) are able to amplitude modulate a laser beam at very high speed. For example modulation bandwidths in excss of 50MHz are readily achievable.

In an AOM a laser beam is caused to interact with a high frequency ultrasonic sound wave inside an optically polished block of crystal or glass (the interaction medium). By carefully orientating the laser with respect to the sound waves the beam can be made to reflect off the acoustic wavefronts (Bragg diffraction). Therefore, when the sound field is present the beam is deflected and when it is absent the beam passes through undeviated. By switching the sound field on and off very rapidly the deflected beam appears and disappears in response (digital modulation). By varying the amplitude of the acoustic waves the intensity of the deflected beam can similarly be modulated (analogue modulation).

It is usual to choose the deflected beam as the one that is used in the optical system because it can be switched on and off with high extinction ratio (typically >40dB) and intensity can be varied from zero to more that 85% of the incident beam. The rate at which the beam can be modulated is governed by the time it takes the acoustic wavefronts to traverse the laser beam, which depends on the beam diameter and the acoustic velocity in the interaction medium.

The sound waves are generated by a transducer, usually a thin wafer of lithium niobate, that is bonded onto the interaction medium using a highly efficient cold-weld metallic bonding process. When a high frequency electrical signal is applied to the transducer it vibrates, generating the acoustic wave. The signal is derived from an RF driver, which generates a high frequency carrier that is itself modulated by an analogue or digital input signal.

Principal applications for AO modulators are pre-press (putting image and text data onto films or plates as part of the printing process), laser imaging and displays, switching in telecom fibres, instrumentation and research.

1. Fiber-coupled Acousto-optical Modulators (AOM)

Our standard fibre-coupled AOMs are listed below. If you would like to see a detailed technical data sheet just click on the relevant model number. If you do not see a device that meets your requirements please contact one of our engineers. We manufacture application-specific AOMs and would be pleased to design one that meets your needs.

The devices listed are aimed at fibre-optic telecommunications applications but we can also offer fibre-coupled versions of our standard AOMs, if required. If you are considering a non-standard device, or are just not sure which of the listed devices would suit you best, you may find it useful to email us with your questions.

We offer a wide range of standard fibre-coupled AOMs with the following characteristics: 

Our standard FCAOMs are listed below.Options: Single mode, polarisation maintaining and multimode, with or without connectors. Available in two, three or four fibre package configurations.

Model Description Optical Power Wavelength Rise/Fall time Operating Frequency Driver
S200-0.4C2N-3-F2P Non-hermetic, PM   450, 532, 633, 780 nm 25 ns 200 MHz

1xxxAFAINA- 3.0 HCR

1xxxAFDINA- 3.0 HCR

T-M150-0.5C2W-3-F2S Non-hermetic, SM   780 nm 30 ns 150 MHz
T-M150-0.5C2W-3-F2P Non-hermetic, PM   780 nm 30 ns 150 MHz
T-M150-0.4C2G-3-F2S Hermetic, 5W average 1060nm 30ns 150MHz
T-M200-0.1C2G-3-F2S Hermetic, SM, 1W average 1060nm 10ns 200MHz
T-M200-0.1C2G-3-F2P Hermetic, PM, 1W average 1060nm 10ns 200MHz
S-M150-0.4C2G-3-F2S Non-hermetic, SM, HI1060   1060nm 30 ns 150 MHz
T-M260-0.1C2G-3-F2P Hermetic, PM   1060nm 6 ns 260 MHz
T-M200-0.1C2G-3-F2P Hermetic PM   1060nm 10 ns 200 MHz
T-M200-0.1C2G-3-F2S Hermetic SM HI1060   1060nm 10ns 200MHz
T-M150-0.4C2G-3-F2P Hermetic, Fujikura PM980 5W average 1060nm 30ns 150MHz
T-M200-0.1C2J-3-F2P Hermetic, Fujikura PM1550 1W average 1550nm 10ns 200MHz
T-M200-0.1C2J-3-F2S Hermetic, SMF28 1W average 1550nm 10ns 200MHz
T-M110-0.2C2J-3-F2S Hermetic, SMF28 1W average 1550nm 25ns 110MHz
T-M110-0.2C2J-3-F2P Hermetic, Fujikura PM1550 1W average 1550nm 25ns 110MHz
T-M080-0.4C2J-3-F2S Hermetic, SMF28 1W average 1550nm 35ns 80MHz
T-M080-0.4C2J-3-F2S Hermetic, PM 1W average 1550nm 35ns 80MHz
T-M080-0.4C2J-3-F2P Hermetic, Fujikura PM1550 1W average 1550nm 35ns 80MHz
T-M040-0.5C8J-3-F2S SMF28 1W average 1550nm 70-100ns 40MHz
T-M080-0.5C8J-3-F2S Hermetic 1W average 1550nm 70-100ns 80MHz
T-M080-0.5C8J-3-F2P Hermetic, PP 1W average 1550nm 70-100ns 80MHz
T-M040-0.5C8J-3-F2P Polarisation Maintaining, 1W average 1550nm 70-100ns 40MHz
T-M080-0.3C2Z-3-F2S Nufern SM1950 5W average 2000nm 70-100ns 80MHz
T-M080-0.3C2Z-3-F2P Nufern PM1950 5W average 2000nm 70-100ns 80MHz

For more information, please doanload the catalogue here.

2. STBR Series Fiber Coupled AOM

General Specification

Switching time (nsec) <100
ON/OFF Extinction (dB) >50
Back Reflection (dB) <-50
Insertion Loss (dB) < 2.5
Wavelengths (nm) 380-2100nm
Low Electric Power Consumption (dBm) <23
Operating Wavelength Range (nm) >60
Model # Wavelength (nm) Center Frequency (MHz) Rise Time (ns) Modulation Bandwidth (MHz) Fiber Type
STBR-TEM-110-10-55-2FP 380-1600 110 55 10 SM or PM
STBR-TEM-200-25-20-2FP 380-1600 200 20 25
STBR-TEM-250-50-10-2FP 380-1600 250 10 50
STBR-TEM-500-100-5-2FP 380-1600 500 5 100
STBR-IPM-200-25-20-2FP 1000-2100 200 20 25
STBR-IPM-500-100-5-2FP 1000-2100 500 5 100
STBR-AMM-100-20-25-2FP 1000-2500 100 25 20
STBR-AMM-55-8-70-2FP 1000-2500 55 70 8

3. Fiber coupled AOM (AOMR series)

Part Number AOMR-80 AOMR-120
Interactive Material TeO2 TeO2
Acoustic Mode Longitudinal Longitudinal
Operating Wavelength 1064nm 1064nm
Operating Frequency 80MHz 120MHz
Fiber Type Single mode Hi 1060g Single mode 10/125
Insertion Loss <2.0dB <2.0dB
On/off Contrast Ratio >40dB >40dB
Throughout Laser Power >3W CW (>5kW pulsed) >3W CW (>5kW pulsed)
Light Polarization Random Random
RF Power Level >1.5W >2W
Impedance 50 Ohm 50 Ohm
VSWR <1.2:1@ 80MHz <1.2:1@ 120MHz
Mechanical Dimensions1 142mmx44mmx37mm 139mm×56.5mm×25.5mm
RF Driver AOMD-80-1.5 AOMR-120-2

RF Driver for AOMR series 

Model AOMD-80-1.5 AOMR-120-2
AOM AOMR-80 AOMR-120
Output Frequency 80.000 MHz + 0.01% Quartz Stabilized 120.000 MHz + 0.01% Quartz Stabilized
Spurious Levels -50 dBc Maximum -50 dBc Maximum
Harmonic Distortion -15 dBc Maximum -15 dBc Maximum
Modulation Input TTL,  Minimum RF Power TTL, Minimum RF Power
Extinction Ratio 50 dB Minimum 50 dB Minimum
RF Rise 200ns Max, PRF: 10 to 90 % 200ns Max, PRF: 10 to 90 %
Fall Time 20 ns Max, PRF: 90 to 10 % 20 ns Max, PRF: 90 to 10 %
RF Output Powe >1.5 Watt >2 Watts
Output Impedance 50 Ohms Nominal 50 Ohms Nominal
Supply Voltage + 24 VDC±0.5 Volt + 24 VDC±0.5 Volt
Supply Current 1 Amp Maximum 1.5 Amp Maximum
Mechanical Dimensions 114mm×58mm×30mm 114mm×58mm×30mm
MAXIMUM RATINGS:
Supply Voltage + 28 Volts + 28 Volts
Power Output No DC Feedback Allowed No DC Feedback Allowed
Case Temperature + 55°C + 55°C
 
CONNECTORS & MECHANICAL:
RF Output Connector SMA Female SMA Female
Modulation Input connector Wire Wire
Power Supply connections Wire Wire

Fiber coupled AOM (AOMM series)

Specifications:
Parameters Unit AOMM-①-②-③-④-⑤
Central wavelength nm 1064 1550 2000
Wavelength range nm ±5 ±5 ±5
Typ. Insertion loss dB 1.2 2.0 2.0
Max insertion loss dB 1.5 3.0 3.0
Min isolation dB 50 50 50
Min return loss dB 50 50 50
Optical power CW W 2 5 10
Min polarization extinction ratio dB 20 (PM fiber) 20 (PM fiber) 20 (PM fiber)
Peak power kW 10 10 10
RF power W 2 2 2
RF frequency MHz 35/40/60/80/100/120/150/200
VSWR MHz <1.2:1 (50ohm)
Tensile load N 5
Fiber type / 9/125, 10/125, 15/130, 20/130 or others
Fiber length m 1
Operating temperature °C 5-50

Ordering code:

AOMM- ①- ②- ③-④-⑤ ①: Wavelength in nm, 1064, 1550, 2000 ②: Frequency in MHz, 35, 40, 60, 80, 100, 120, 150, 200 ③: Fiber type, L06-6/125, L09-9/125, L10-10/125 DCF, L12-12/125 DCF, P06-PM98, P09-PM1550, P10-PM10/125           DCF, S-Specify ④: Fiber jacket on In&Out, B-Bare fiber, L-900um loose fiber, C-3mm loose fiber, S-Specify ⑤: Fiber length: 10-1.0m
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