Location of EML in the optical module
EML packs a laser and modulator onto a single chip, which gives it cleaner modulation at high speeds compared to directly modulated alternatives. That's why you'll find EML in most 800G DR8 and 2xFR4 modules shipping today. • The transmitter laser modulation mode is marked as EML in the Moduletek 25G ER optical transceiver datasheet Figure 1 Moduletek 25G ER Optical Transceiver Datasheet (EML Marked) • The transmitter laser modulation mode is marked as EML in the Moduletek 10G ZR optical transceiver datasheet Figure 2. An EML electro-absorption modulated laser combines a distributed feedback EMLs excel in long-haul links without needing amplifiers. Picking the wrong one means you're either overpaying or underperforming, so it's worth understanding what each type actually does well.
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