AGERE 2623Y, 2623N, 2623CSA, 2623CS Datasheet

10 Gbits/s Lithium Niobate Electro-Optic Modulator

Data Sheet

May 2001

The Lithium Niobate Modulators include three single-drive
modulators (2623N, 2623Y, 2623CS) and a single-drive modula­tor with an integrated attenuator (2623CSA). All devices are
capable of modulation rates up to 10 Gbits/s.

Features

■

Ti-diffusion process

■

Single-drive technology

■

C- and L-band models

■

Slim, hermetic package

■

Bandwidths up to 10 GHz

■

Operational over a temperature range of 0 °C to
70 °C

■

43 Ω design for minimal electrical reflections

■

Angled interfaces for minimal optical reflections

■

Integrated optical attenuator available on
10 Gbits/s modulator (2623CSA)

■

Tested to

Telcordia Te chnologies

* 468

Benefits

■

Excellent long-term bias stability

■

Internal polarizer

■

Low modulation voltages

Applications

■

Digital high-speed telecommunications:
— SONET: OC-1 through OC-192
— SDH: STM-16, STM-64
— Undersea communications

■

Internet data communications

■

SONET/SDH test equipment

*

Telcordia Technologies

is a trademark of Telcordia Technologies,

Inc.

Data Sheet

10 Gbits/s Lithium Niobate Electro-Optic Modulator May 2001

22 Agere Systems Inc.

Description

The 10 Gbits/s Electro-Optic Modulator is designed for
long-wavelength, single-mode external amplitude mod­ulation applications. It uses an integrated Mach­Zehnder configuration to convert single polarization
CW light from a semiconductor (DFB) laser into a time­varying optical output signal. Agere Systems Inc. also
offers a 10 mW CW laser with polarization-maintaining
fiber (D2525P) to use as a source for the modulator.

The Ti-diffusion process is a standard feature on all
modulator devices. The 2623N, 2623Y, and 2623CS
are single-drive, 10 Gbits/s modulators; the 2623CSA

is a single-drive, 10 Gbits/s modulator with an attenuat­ing section. Variable attenuation to >19 dB is achieved
through a dc bias voltage.

The package is hermetic to protect the LiNbO

3

die from
the environment. Novel processing techniques now
make it possible to achieve 20-year operation with little
drift in the dc bias point. The modulator is tested to, and
meets the intent of TR-NWT-00468.

Other standard features include PANDA-type polariza­tion-maintaining fiber (PMF) for the optical input (all
codes) and output (2623N, 2623Y, and 2623C) fiber
with FC-type connectors that are keyed to the axis of
polarization. Custom designs are available.

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso­lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.

Parameter Symbol Min Max Unit

Storage Temperature T

stg

–40 85 °C

Optical Input Power @ 1.5 µm

P

IN

—

30 mW

RF Voltage (peak to peak) V

RF

—

10 V

dc Voltage (RF input) V

dcRF

–20 20 V

dc Voltage (Attenuator input) V

dcATT

–25 25 V

Operating Temperature T

OP

070°C

Data Sheet
May 2001 10 Gbits/s Lithium Niobate Electro-Optic Modulator

3

Agere Systems Inc.

Optical/Electrical Characteristics

* Bandwidth stated is electrical-optical-electrical as determined by the ratio of the received RF electrical power (at a photodiode) relative to the

RF electrical power used to drive the modulator. This response is referenced to the value at 130 MHz.

Note: Circuitry in dotted lines is used only with the 2623CSA.

Figure 1. Recommended Operating Circuit Diagram

Figure 2. Equivalent Circuit Diagram

Table 1. Optical/Electrical Characteristics

Parameter Min Typ Max Unit

Operating Wavelength:

C-band
L-band

1525
1565

—
—

1565
1620

nm
nm

Insertion Loss:

2623N, 2623Y, 2623CS
2623CSA

3

3.5

3.7

4.5

5.5

6.5

dB

dB
Extinction Ratio @ dc 20 27 — dB
Extinction Ratio @ RF — 13 — dB
S11 Optical Return Loss — — –35 dB
Bandwidth* 8 10 — GHz
Drive Voltage (Vπ) @ dc 2.8 3.1 4.0 V
Drive Voltage (Vπ) @ 1 GHz 3.5 4.1 5.0 V
Attenuation Voltage @ –19 dB 15 19 22 V
Electrode Impedance — 43 — Ω
S11 Electrical Return Loss (0.13 GHz—5 GHz) — –15 –13 dB
S11 Electrical Return Loss (5 GHz—10 GHz) – –14 –12 dB
S11 Electrical Return Loss (10 GHz—18 GHz) — –8 –6 dB

MODULATOR

DRIVER

BIAS

TEE

dc BIAS

CONTROLLER

PHOTODETECTOR/

PREAMP

dc
ATTENUATION
CONTROLLER

HIGH-

SPEED

DATA
INPUT

PMF

CW-LASER 2623N, 2623Y, 2623CS, 2623CSA

SPLITTER

SEE NOTE.

2623N, 2623Y, 2623CS

43

Ω

0.2 µF

43

Ω

0.2 µF
–10 pF

2623CSA

1-1063 (F)

1-1062 (F)