New Focus 9091 User manual

USER’S GUIDE
Five-Axis Fiber Aligner
Model 9091 and Accessories
Includes Model 9131-FS-FC and Model 9131-FS-ST Fiber-Aligner Kits
U.S. Patents: #5,282,393 & #5,400,674
5215 Hellyer Ave. • San Jose, CA 95138-1001 • USA
phone: [phone] • fax: [phone]
e-mail: [e-mail] • www.newfocus.com
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Warranty
New Focus, Inc. guarantees its products to be free of defects for one year from
the date of shipment. This is in lieu of all other guarantees, expressed or implied,
and does not cover incidental or consequential loss.
Products described in this document may be covered by one or more of the
following U.S. patents: #5,282,393 and #5,400,674.
Information in this document is subject to change without notice.
Copyright 2002, 2001–1998, New Focus, Inc. All rights reserved.
The and logos, and NEW FOCUS, Inc. are
registered trademarks of NEW FOCUS, Inc.
Document Number 900983 Rev. D
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Five-Axis Fiber Aligner Contents • 3
Contents
Introduction 5
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Principles of Operation . . . . . . . . . . . . . . . .5
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operation 9
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Specifications 12
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Physical Characteristics . . . . . . . . . . . . . . . .13
Customer Service 14
Technical Support . . . . . . . . . . . . . . . . . . . . .14
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Appendix: Mode Matching 15
Maximizing Coupling Efficiency . . . . . . .15
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4 • Contents NEW FOCUS, Inc.
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Five-Axis Fiber Aligner Introduction • 5
Introduction
Overview
The Model 9091 five-axis fiber-aligner system has the
submicron resolution and stability required for align-
ing single-mode optical fibers. The aligner has three
axes of translation and two axes of rotation. Proper
kinematic design, precision 80-pitch adjustment
screws, and sapphire seats produce lifelong X and Y
resolutions of 0.01 µ m with minimal hysteresis.
Typical five-axis fiber aligners are built by stacking five
single-axis stages. Each of these stages contributes its
own slop and error to your optical system. In contrast,
our aligner consists of a single stage positioned by five
actuators and mounted in a solid frame. This design
provides five unique degrees of freedom and exactly
one constraint, making it more stable than traditional
fiber aligners.
The New Focus fiber aligner, in conjunction with its
accessories, provides objective-to-fiber capabilities for
ST- or FC-connectorized fibers.
Principles of Operation
The optical fiber is carried in the stage plate of the
aligner (see Figure 1 on page 6). The stage plate is sup-
ported in the X–Y plane by two perpendicular 80-pitch
screws that intersect radially at the fiber end. Rotating
the X- or Y-screws causes a translation of the fiber.
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6 • Introduction NEW FOCUS, Inc.
The stage plate is supported from behind by three 80-
pitch adjustment screws (two Z-screws and the Z-
knob), located at three corners of a square where the
optical fiber is positioned in the fourth corner (Figure
2). You can achieve pure rotation about the fiber end
by holding one of the Z-screws with an Allen wrench
while turning the Z-knob.
To minimize undesirable translation during this rota-
tion, the fiber-end face must be positioned in the fiber-
tip plane defined by the Z-axis screws. Pure Z-axis
translation is achieved by adjusting the Z-knob, which
rotates the two Z-screws equally.
Figure 1:
Front view of
Model 9091
Positioner,
shown with
optional
accessories
Figure 2:
Rear view of
Model 9091
Positioner
X
Y
Z
Optional Model 9092
coupler body
Coarse Y-screw
Fine Y-screw
Fine X-screw
Coarse X-screw
Stage plate
Optional Model 9123
objective holder
Z-knob
Z-screws
Coupler-body screws
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Five-Axis Fiber Aligner Introduction • 7
Accessories
Use the following accessories to attach fibers or
objective lenses to the fiber aligner. Most of these
accessories are shown either in Figure 1 on page 6 or
Figure 4 on page 10.
Model 9092 Coupler Body: Use the coupler body to
hold optical elements, such as objective lenses and
fibers, stationary. You may also need one of the hold-
ers listed below to fit the element into the coupler
body. (For infrared applications, a gap between the
coupler body and the positioner can accommodate IR
cards.) This is included with all Model 9131 kits.
Model 9123 Objective Holder: Attach a standard
RMS-threaded microscope objective to this objective
holder in order to mount it on the Model 9092 cou-
pler body. This is included with all Model 9131 kits.
Model 9126 ST Adapter: These adapters mount ST-
connectorized fibers to the stage plate of the fiber
aligner. This is included with the Model 9131-FS-ST
kit.
Model 9127 FC Adapter: These adapters mount FC-
connectorized fibers to the stage plate of the fiber
aligner. This is included with the Model 9131-FS-FC
kit.
Model 5708 Asphere Adapter: These adapters hold
our Model 572X aspheric lenses and fit directly in the
Model 9092 coupler body.
Model 5709 RMS Adapter: These adapters also
work with our aspheric lenses. Attach this adapter to
the Model 9123 to fit it into the coupler body.
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8 • Introduction NEW FOCUS, Inc.
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Five-Axis Fiber Aligner Operation • 9
Operation
Setup
1. Attach the Coupler Body (optional): If you are
using the Model 9092 coupler body, fasten it to the
fiber positioner with the two provided 8-32 (M4)
screws and a 9/64" (3-mm) Allen wrench.
Figure 3:
Attaching the
coupler body
2. Mount the Aligner to the Table: For maximum
rigidity, mount the fiber aligner on a New Focus
pedestal riser. The fiber end is approximately 1"
(25.4 mm) above the aligner base. Mounting holes
are placed on two orthogonal sides of the aligner
for either left- or right-handed mounting.
3. Mount the Output Fiber: Mount the connector-
ized fiber to the appropriate adapter: Model 9126
for ST connectors or Model 9127 for FC/PC con-
nectors.
For bare fibers, we recommend using a bare-fiber
terminator to give it an ST or FC connector.
Coupler-body screws
Note:
Note:
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10 • Operation NEW FOCUS, Inc.
Figure 4:
Mounting the
output fiber
4. Attach the Output Fiber to the Positioner:
Insert the fiber assembly into the back of the
positioner, firmly seating the assembly against the
ledge in the rear of the stage plate. Tighten the
fiber-adapter lock with a 1/16" (1.5-mm) Allen
wrench.
Figure 5:
Attaching the
output fiber to
the positioner
Alignment
For most adjustments to the aligner, you will need a
1/8" (3-mm) Allen wrench.
Coupler Translation (Positioning the Focus)
1. Screw the objective lens into the Model 9123
Objective Holder.
For New Focus aspheric lenses, you can mount the lens
into the coupler body using the Model 5709 RMS adapter
Optional
Model 9127
FC/PC adapter
Optional
Model 9126
ST adapter
Fiber-adapter lock
Insert fiber assembly
into positioner.
Note:
Note:
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Five-Axis Fiber Aligner Operation • 11
and the Model 9123 objective holder, or using the Model
5708 1" adapter.
2. Position the holder in the coupler body so that the
objective-lens focus is in the fiber-tip plane.
3. Tighten the thumbscrew to lock the objective into
place.
X/Y Translation
The coarse X- and Y-screws each translate the fiber
over a 3-mm range with 1-µm resolution. With the fine
X- and Y-screws, 8 µm of final tuning can be achieved
with a resolution of 0.01 µm.
Z Translation
Turning the Z-knob translates the fiber along the
Z-axis of the aligner. This adjustment produces a
1-µm resolution over a 3-mm range.
Rotation about the Fiber End
Pure tilt about the fiber end is achieved by holding one
of the two Z-screws with an Allen wrench while
turning the Z-knob, as shown in Figure 6.
Figure 6:
Rotation about
the fiber end
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12 • Specifications NEW FOCUS, Inc.
Specifications
Performance
Model # 9091
Degrees of Freedom X, Y, Z, θ
x
, θ
y
X,Y, Z Travel 3 mm
X,Y Coarse Resolution/5º Turn 4.4 µm
X,Y Fine Resolution/5º Turn 0.02 µm
Z Resolution/5º Turn 4.4 µm
θ
x
, θ
y
Range 5 degrees
θ
x
, θ
y
Resolution/5º Turn 231 µrad
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Five-Axis Fiber Aligner Specifications • 13
Physical Characteristics
2x C'BORE FOR
#8 (M4) SHCS
6x 4-40 (M2.5)
THREAD
0.00 0.25 (6.3) 0.25 (6.3) 0.50 (12.5) 1.00 (25.0)
0.00
0.25 (6.3)
0.50 (12.5)
1.00 (50.0)
0.25 (6.3)
.00 1.00 (25.4) 3.40 (86.5) 0.22 (5.5) 1.25 (31.7)
.00
1.00 (25.4)
3.40 (86.5)
0.22 (5.5)
1.25 (31.7)
4x 8-32 (M4)
THREAD
.00
2x 1.00 (25.4)
2x 2.00 (50.4)
FIBER CHUCK
LOCK
.00 2.48 (63.0) .60 (15.2) 1.19 (30.2)
REAR VIEW
FRONT VIEW
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14 • Customer Service NEW FOCUS, Inc.
Customer Service
Technical Support
Information and advice about the operation of any
New Focus product is available from our applications
engineers. For quickest response, ask for “Technical
Support” and know the model and serial numbers for
your product.
Hours: 8:00–5:00 PST, Monday through Friday
(excluding holidays).
Toll Free: 1-866-NUFOCUS (1-866-683-6287)
(from the USA & Canada only)
Phone: [phone]
Support is also available by fax and email:
Fax: [phone]
Email: [e-mail]
We typically respond to faxes and email within one
business day.
Service
In the event that your fiber aligner becomes damaged,
please contact New Focus for a return authorization
number and instructions on shipping the unit back for
evaluation and repair.
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Five-Axis Fiber Aligner Appendix: Mode Matching • 15
Appendix: Mode Matching
Maximizing Coupling Efficiency
To maximize the coupling efficiency into a single-
mode optical fiber, the incident optical field
distribution at the fiber face should match the mode
profile of the optical fiber. This can, in general, be
modeled as a Gaussian with a 1/ e width of ω
m
;
typically, the modal field diameter is slightly larger
than the core diameter. Given a lens with focal length f
and an incident Gaussian beam with diameter D , the
lens produces a focused spot diameter, ω , where
where λ is the wavelength of the incident light. (See
Figure 7 on page 16.) Assuming that the incident laser
beam has a waist of ω
1
, the lens should be placed at a
distance d
1
so that the focused waist diameter ω
matches the modal field diameter ω
m
. The distances d
1
and d can be found from the following expressions:
where
ω4λf
πD
----------
=
d1fω1
ω
------ f2f0
2
–±=
df
ω
ω1
------ f2f02
–±=
f0πω1ω
λ
--------------=
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16 • Appendix: Mode Matching NEW FOCUS, Inc.
Figure 7:
A lens with
focal length f
focuses an
incident
optical beam
of diameter D
to a waist of
diameter ω , as
expressed by
ω4λf
πD
---------=
ω1
D
d
1
ω
d
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