Ch10Sec5_1

Ch10Sec5_1 - THE FIBER FORUM Fiber Optic Communications...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Dr. Joseph C. Palais 10.5 1 THE FIBER FORUM Fiber Optic Communications Dr. JOSEPH C. PALAIS PRESENTED BY
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dr. Joseph C. Palais 10.5 2 Section 10.5 Electroabsorption Modulators
Background image of page 2
Dr. Joseph C. Palais 10.5 3 Modulation Choices 1. Direct (internal) modulation. Works for LEDs and laser diodes. Limit on LEDS is about a few hundred MB/s. Limit on laser diodes is a few Gb/s. Systems now work up to 40 Gb/s. Electrical Signal Optical Signal LD
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dr. Joseph C. Palais 10.5 4 2. External modulation. The light source operates continuously (cw) and feeds into the modulator. Optical Signal LD DC Electrical Signal MOD Earlier (chapter 4), we discussed the integrated optic interferometric Mach-Zehnder external modulator. We now introduce a newer modulator.
Background image of page 4
Dr. Joseph C. Palais 10.5 5 ELECTROABSORPTION MODULATOR (EAM) This is an external modulator used for high speed (above 2.5 Gb/s) fiber optical communications systems. It is based on the Franz-Keldysh effect . When a reverse bias is applied to a semiconductor, the
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

Ch10Sec5_1 - THE FIBER FORUM Fiber Optic Communications...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online