High Performance
Fiber Optics

PSI-0303

Digital Modulator Bias Controller
Product Description
The PSI—0303 digital modulator bias controller is a full featured laboratory instrument designed for precise control of Mach-Zehnder interferometer fiber optic
modulators. Designed to operate in the presence of a digital modulation signal,these controllers accurately prevent bias point drift from any of four preset or one
user set modulator transfer function points. Through use of a proprietary control
algorithm, the controller maintains bias control without the use of a dither signal.
Measurements are simplified through use of the PSI-0303 in your link or component evaluation set-up. With an internal optical coupler and photo-detector an internal feedback path automatically establishes lock on the desired bias point.

Photonic Systems, Inc. (PSI)
is a recognized expert in thedesign, analysis and implementation of high performance fiber optic systems.
With decades of collective
experience, the PSI team offers comprehensive fiber optic engineering solutions toAutomatic control modes Benefits
allow the operator to selectComplete- includes optical coupler and photo-detector
Quad+, MAX, Quad– or MINAccurate- maintains drift to within 2° at Quad points; +/0.2° at Max and Min points
bias points. A 10-turn potenEasy to use– front panel optical and bias connections,tiometer provides manual
LCD readout of bias voltage and optical power
control for fine tuning to a
specific bias point. An LCD
display shows the bias voltage and optical output power. All features allow for simplified characterization of a modulator’s Vπ, optical insertion loss, optical extinction
ratio and rate of bias point drift.
Beyond standard specifications, PSI can modify the PSI-0303 to meet the exact requirements of your application. Please contact PSI for information on custom requirements.

government, military andcommercial customers.

900 Middlesex Turnpike, Bldg 5Billerica, MA 01821
Phone: 978-670-4990
Fax: 978-670-2510
E-mail: info@photonicsinc.com
www.photonicsinc.com

Applications• Modulator design• Fiber optic component evaluation• Spectroscopy systems• Data communications systems

PSI-0303 Digital
Modulator Bias
Controller
Specifications
Parameter

Typical ValueUnits

Fiber TypeSMF-28—Wavelength

1300-1550

nm

Optical Insertion Loss0.8dB0 to –15
0 to –10dBm

Output DC Bias Voltage+/-15V

DC Bias Port Impedance<1Ω

Modulator Vπ standard Range; unit may be factory set for other values as needed

2.4– 7.6

V

Dither Frequency

n/aInput Optical Power

Quad + or Max or Min

Bias Point Error

Quad+ or Quad– point
Max or Min point+/- 5+/-3Deg.

10, maximum

sec.

55sec.
sec.

Case Dimensions (WxHxD)

5.75x5.25x8.75

In.

Case Weight
AC Adapter Weight

3.50.5Lb.
Lb.

Storage Temperature-25 to +60

Deg. CPower115v +/-9% @25mA—

Initial Auto Bias Point Acquisition Time
Drift Compensation Response Time

0 to -10 dBm input power-10 to –20 dBm input power

The PSI 0303 Digital Signal
Modulator bias controller (U.S.
Patent pending) has a desirable
spectral output: none at all.
When you apply digital data (at2.5Gbps, 10Gbps, or any otherdata rate) to a modulator controlled by the PSI 0303, its output
light is modulated by your digital
data only: there is no dither tone
present!

Options
P/N suffix

Description-019-xxxx

Custom Optical Wavelength (user specified, nm)-003

High Optical Power-004

High Bias Voltage-001, -002

Optical connector (FC standard, others user specified); SC, APC-018

Polarization maintaining fiber, coupler and connectors-024

Polarization maintaining coupler & connectors combined with high optical power; input range 100uW to 10mW

Phone: 978-670-4990
Fax: 978-670-2510
E-mail: info@photonicsinc.com

www.photonicsinc.com
Rev. 8/25/05

900 Middlesex Turnpike, Bldg 5Billerica, MA 01821