OPLL: Optical Phase Locked Loopwith Tunable Frequency Offset
The new Digital Optical Phase Locked Loop (OPLL) productconsists of two RIO high-performance narrow linewidth
PLANEX™ lasers, high-speed phase lock loop circuitry and a
microprocessor for easy setup, fast tuning and interactivecontrol. It provides two optical signals precisely tuned and phaselocked to a specified value of optical frequency difference.
OPLL’s unique design is based on RIO’s proprietary External
Cavity Laser Planar Technology (PLANEX™). PLANEX laser
cavity consists of a gain chip and a Planar Lightwave CircuitPLC) with waveguide Bragg grating. PLANEX laser has significant
advantages, critical to OPLL performance: Low frequency noise, narrow linewidth Low relative intensity noise (RIN) Excellent wavelength stability
 Offset frequency tuning
The OPLL module is providing two optical signals with a tunablewavelength offset and locking wavelength difference.
Performance and features OPLL module provides end users witha stable, self-contained, easy-to-use & cost-effective solution.
This is the most reliable alternative to expensive custom OPLL
modules, based on fiber lasers or other laser sources.
The OPLL module has optical and electrical I/O and standard
data interfaces for external monitoring and control. The OPLL
module is an integrated source solution for fiber optic sensing
applications, such as Brillouin DTSS systems for oil & gas andinfrastructure monitoring, LIDAR and microwave photonics.

Preliminary Specification
January 2011

KEY FEATURES

Two lasers outputs with specified
wavelengths
Selectable wavelength offset lockingand monitoring
PM output
Option with optical amplifier for highoutput power
Monitoring ports for optical signal, RFbeat frequency and PLL lock signal
Single longitudinal mode, narrow
linewidth, long coherence length
1528nm-1565nm, ITU-T DWDM
wavelength or custom
Compact, low power dissipation
Digital controller and firmware

OPLL Block-diagram

GUI, USB port and Data I/O
APPLICATIONSBrillouin (BOTDA/BOTDR) Distributed
Temperature and Strain sensing (DTSS)
Metrology
Coherent Optical Communications
Microwave photonic s
RF over the fiber
LIDAR
Tunable heterodyne source
Testing of high speed optical receivers

Rev.0.0.6
Proprietary Information© Redfern Integrated Optics (RIO),Inc. 3350 Scott Blvd, Bldg 62
Santa Clara, CA 95054 USA

Tel (408) 970 3500
Fax (408) 970 3200
sales@rio-inc.com

All preliminary information contained herein is believed to be accurate and is subject
to change without notice. No responsibility is assumed for its use. Redfern
Integrated Optics, Inc., its subsidiaries and affiliates, or manufacturer, reserve theright to make changes, without notice, to product design, product components, andproduct manufacturing methods. Some specific combinations of options may not beavailable. Please contact Redfern Integrated Optics for more information. ©Redfern
Integrated Optics, Inc.. All rights reserved.

Absolute Maximum Ratings
Operation of the device beyond these maximum conditions may degrade device performance, lead to device failure, shorter
lifetime, and will invalidate the device warranty.

Parameter

MinMaxUnit

Storage temperature- 40+ 85ºC

Supply voltage

VESD-susceptibility
Humidity ( Non condensing )

5500

V

95%

Performance specifications
Parameter
Output Power1L1 (port 1) wavelength
1L2 (port 2) wavelength2
Lorentzian linewidthSide mode suppression ration

SymbolPoutMin12

L1, L2, CW
SMSR
1/2S (f)Frequency noise under locking conditions,BbConditions
Ports L1, L2

Relative Intensity Noise
3Frequency locking range

RIN

Continuous locking tuning range

fsweepfreffstep

45at 100 Hzat 1 kHz> 10 kHzflock

Reference locking offset frequency
Frequency step tuning, GUI selectable

Typ51550.12
1 + 0.09
1050
1000
200

8Max

Hz/ Hz-155
14dB/HzGHz

1GHz

110.01

UnitmW
nm
nm
kHzdB

GHz

10MHz

Locked step response time at 10 MHz step

105secLocked step response time at 100 MHz step10015

Phase noise at 100 kHz offset from the carrier

PSD

Power variation (RMS) over 1 MHz offset tuning
Sweep mode, continuous, numbers of step and step
size are GUI selectable
Operating case temperaturePower Dissipation
AC power consumption
Dimensions

P/P

-65
0.1

sec
MHz
MHz/secdBc/Hz%fstop –fstart

1GHz

Locked step size

fSearch for lock time outside of lock range

f/t

1
2
3

300
50

1055
C
12W
40
W
19” rack mountable, 2U

Custom wavelength is available, see ordering information
Under locking condition Reference locking frequency differenceGUI selectable ranges

Output ports and connectors
L1L2
Beat frequency
Beat frequency

Type
Optical FC/APC PM
Optical FC/APC PM
Optical FC/APC PM
Electrical SMA

Lock monitor

Electrical BNC

Data
PowerFuse
consumption

USBAC

Rev.0.0.6
Proprietary Information© Redfern Integrated Optics (RIO),
Inc. 3350 Scott Blvd, Bldg 62
Santa Clara, CA 95054 USA

Function
Laser 1 output
Laser 2 output
Lasers output L1 and L2
Lock Monitor
Control interface

Tel (408) 970 3500
Fax (408) 970 3200
sales@rio-inc.com

Description

RF monitor (-20 to –30 dBm)
-5V to +5V into resistive load ≥1k if actively locking
In open loop, monitor is near 0interface, GUI85 to 260 VAC
US – single 1A, Europe dual 1A

All preliminary information contained herein is believed to be accurate and is subject
to change without notice. No responsibility is assumed for its use. Redfern
Integrated Optics, Inc., its subsidiaries and affiliates, or manufacturer, reserve theright to make changes, without notice, to product design, product components, andproduct manufacturing methods. Some specific combinations of options may not beavailable. Please contact Redfern Integrated Optics for more information. ©Redfern
Integrated Optics, Inc.. All rights reserved.

Ordering Information
RIO

21

35Product family
2OPLL

3Controller Interface
USB

5

Fiber/Connector
PM/FC-APC

Laser Safety Information
Laser Modules are classified as FDA/CDRH Class
IIIb laser products per CDRH, 21 CFR 1040 laser
safety requirements.

Rev.0.0.6
Proprietary Information© Redfern Integrated Optics (RIO),
Inc. 3350 Scott Blvd, Bldg 62
Santa Clara, CA 95054 USA

Tel (408) 970 3500
Fax (408) 970 3200
sales@rio-inc.com- 1-XX-1

1Linewidth<15 kHz0001
ITU

Wavelength
1550±10nm
custom
DWDM ITU channel

1Output Power
5 mW (typical)

DANGER

All preliminary information contained herein is believed to be accurate and is subject
to change without notice. No responsibility is assumed for its use. Redfern
Integrated Optics, Inc., its subsidiaries and affiliates, or manufacturer, reserve theright to make changes, without notice, to product design, product components, andproduct manufacturing methods. Some specific combinations of options may not beavailable. Please contact Redfern Integrated Optics for more information. ©RedfernIntegrated Optics, Inc.. All rights reserved.