P.O.Box 597
Fremont, CA 94537
Tel: (510) 739 6049
Fax: (510) 405 9030
Http://www.YYLabs.com

Specification for
Dual-Parallel-MZ Modulator Bias Controller (0053)
for DQPSK Application(Last updated on 1/7/2010, Rev.1.0)

Dual-Parallel-MZ-Modulator Bias Controller model 0053 is a device specially designed tocontrol the bias positions for dual-parallel-modulator used for DQPSK applications. DQPSK(Differential quadrature phase-shift key) modulator can improve optical transmission properties
such as total reach, dispersion tolerance, or spectral efficiency. Since the Dual Parallel modulator
is a combination of phase modulator and Mach-Zehnder modulators, there are three bias points
requiring controllers. YY Labs’ Dual-Parallel-MZ modulator bias controller has been developed
especially for this kind of device.
YY Labs’ Dual-Parallel-MZ modulator bias controller (DPMZ MBC 0053) is a full-function
miniature OEM version of the Modulator Bias Controller (MBC) family. It simultaneously sets
the first and second modulators at Null points and the third modulator at quad point. The slope ofeach point is selectable from the board.

IPeakQuad

Quad-NullVbias

VFeatures of Dual-Parallel-MZ-MBC (DP MBC 0052B)
••
••••
•

Three modulators can be controlled with one controller(1st, 2nd modulator at Null/peak mode, the 3rd at Quad);
User selectable locking slope (NULL ↔ PEAK);
Two photodiodes are integrated in the controller with an option to use the external PD
integrated in the modulator to replace one of the photodiode.
Two operation modes: calibration mode and locking mode;
Both differential bias outputs and single side bias outputs are provided.
Calibration-off mode for quick system setup in locking mode;Low profile (3.55” * 1.85” * 0.65”).

1P.O.Box 597, Fremont, CA 94537-0597, T: (510)-739-6049, F:(510) 405-9030, E:yanyin@YYLabs.com, W:www.YYLAS.com

1. Dual-Parallel-MZ-MBC Specifications
PARAMETERS

MIN

TYP

MAX

UNITS

Optical Performance
Detector Input Power1-30-10dBm

Optical wavelength
Electrical Performance

1000

1650

nm

Bias voltage
Null Mode Extinction Ratio2
Locking Slope-131340VdB

0.1%%Hz25
Positive or Negative
Two Null (Peak) positions,
one Quad+ or (Quad-) position

Locking Mode
Pilot tone
Modulation Depth (QUAD)3Modulation Depth (Null)
Pilot Tone Frequency
Power Supplies
Positive Power Voltage
Negative Power Voltage
Positive Power Current
Negative Power Current

21K
14.5
-15.5

15-15
100
60

15.5
-14.5

V(DC)
V(DC)
mA(DC)mA(DC)

GeneralOperating temperature
Storage Temperature
Dimension
Weight0-4070Degree C+85
Degree C
3.55x1.85x0.65 inch
0.2 lb

1. For a given input, detection power refers to the coupled optical power to thephotodiode of DPMZ-MBC when the modulator output is at its minimum attenuation(The detection power does not describe the detected power at locking status).
2. In this case, the modulator output power was greater than 0 dBm. 1% coupler wasused. The distinction ratio will be close but not exceed the distinction ratio of themodulator.
3. Optical Modulation Index = amplitude of modulation/Vπ.

2
P.O.Box 597, Fremont, CA 94537-0597, T: (510)-739-6049, F:(510) 405-9030, E:yanyin@YYLabs.com, W:www.YYLAS.com

Major Application
Bias 1CW Laser
Pi/2
Bias 3
Bias 2

Bias control
outputPD1

PD2

Dual-Parallel-MZ MBC 0052B
Figure 2. Configuration of DPMZ modulator bias controller for DQPSK application

3P.O.Box 597, Fremont, CA 94537-0597, T: (510)-739-6049, F:(510) 405-9030, E:yanyin@YYLabs.com, W:www.YYLAS.com