Experimental Study of 1.55-μ m EML-Based Optical IM/DD PAM-4/8 Short Reach Systems

• We experimentally evaluate high-speed intensity modulation/direct detection (IM/DD) transmissions with a 1.55-μ text broadband electro-Absorption modulated laser and pulse amplitude modulations (PAM). We demonstrate 80 Gb/s/ λ PAM-4 and 96 Gb/s/ λ PAM-8 transmissions with low-complexity digital equalizers at the receiver. Performance comparison with different types of equalizers are performed, including linear symbol-spaced feed-forward equalizer (FFE), fractional (half-symbol) spaced FFE and decision feedback equalizer (DFE), with different tap number. It is found that for both cases, a 6-Tap symbol-spaced FFE is sufficient to achieve a stable performance with bit-error-rate below the 7% overhead hard decision forward error correction (7%-OH HD-FEC) threshold over a 4 km standard single mode fiber link. Practical considerations including comparison between adaptive and static equalizer implementation and tolerable fiber chromatic dispersion are discussed.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)

NATURVETENSKAP  -- Data- och informationsvetenskap (hsv//swe)

NATURAL SCIENCES  -- Computer and Information Sciences (hsv//eng)

Nyckelord

direct detection

equalizers

optical modulation

Pulse amplitude modulation

Adaptive optics

Amplitude modulation

Bit error rate

Chromatic dispersion

Data communication systems

Decision feedback equalizers

Digital television

Error correction

Light modulation

Modulation

Optical communication

Radio communication

Single mode fibers

Electro-absorption modulated laser

Feedforward equalizer

Fiber chromatic dispersion

Intensity-modulation/direct-detection (IM/DD)

Performance comparison

Pulse amplitude modulations (PAM)

Standard single mode fibers

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