EM650 Laser Diode + TEC Drive

 

       

Features

  • Integrated current source
  • Integrated temperature controller
  • Integrated monitor detector amplifier
  • High optical output power
  • ITU Wavelengths – Full C band coverage
  • Low RIN
  • Narrow Linewidth
  • PM/SM fiber with or without furcation tubing
  • Simple Interface
  • Small form factor
  • Operates from single +5V supply

 

General Description

The EM650 integrates a high-power fiber-coupled DFB laser with both an ultra-low noise laser current source and temperature controller. It represents a precision OEM solution for fiber coupled high power DFB lasers operating with excellent frequency stability, narrow linewidth, low noise, and stable polarization. The module contains a high-power DFB laser, optical isolator, single-mode fiber pigtail, thermo-electric cooler, thermistor, and monitor detector integrated with a laser current source, temperature controller, and monitor detector readout amplifier. The entire module operates from a single +5 V supply. The unit provides a bi-directional power adjust input that may be used for SBS prevention, for constant power operation in conjunction with the monitor detector readout signal and an external control loop, or for finely adjusting the laser oscillation frequency via chirp. The unit also incorporates a bi-directional temperature adjust input for coarse tuning of the laser oscillation frequency. The module is designed and built using EM4s high-reliability platform for defense components and incorporates an advanced ultra-low noise laser current source. The EM650 drives the internal TEC with an audio quality class AB linear H-bridge and incorporates multiple layers of EMI protection. It is EM4’s highest performance integrated laser solution and offers performance comparable to laboratory equipment in a much smaller package.

Optical Characteristics

TOP=25°C unless otherwise noted, All parameters measured after an initial 60s settling time. VCC = LE = 5.0V with PA and TA open.

Parameter

Sym.

Condition

Min

Typ

Max

Unit

Optical Output Power Setpoint

POP

See ordering information

Pop

 

 

mW

Optical Output Power Fluctuation1

ΔPOP

1σ, tm=400s,

0.1s avg&period

 

20

50

PPM

Long-Term Power Fluctuation

ΔPOP

1σ, tm=20hr,

0.1s avg, 18s period

 

200

500

PPM

Temperature Dependent Power Drift

ΔPT

-10 ≤ TOP ≤ 60°

 

 

500

PPM/°C

Optical Frequency Accuracy

FOP

Top = 25°C

FOP-0.005

 

FOP+0.005

THz

Optical Frequency Instability2

ΔFOP

min-max, tm=100s

@0.8Hz sampling

 

<100

±200

MHz

Temperature Dependent Frequency Drift

ΔFT

-10 ≤ TOP ≤ 60°

 

 

±200

MHz/°C

Side Mode Suppression Ratio

SMSR

 

30

 

 

dB

Polarization Extinction Ratio

 

w/ PM fiber only

17

20

 

dB

Optical Isolation

 

 

30

35

 

dB

Linewidth

Δν

 

 

300

 

kHz

Relative Intensity Noise

RIN

at maximum

 

-155

-150

dBc/Hz

Cold Start Settling Time

 

VCC=VEN 0 to 5V

 

 

30

s

Rise Time (Hot Start)

tR

VEN=0 to 5V

 

30

 

ms

Fall Time (Hot Standby)

tF

VEN=5 to 0V

 

5

 

µs

Back Facet Tracking Over Temp

 

 

-10

 

+10

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