Impulsive coding in optical free-space links: optimum choice of the receive filter and impact of a transmit booster amplifier

Peter J. Winzer; Andras Kalmar

doi:10.1117/12.346171

26 April 1999 Impulsive coding in optical free-space links: optimum choice of the receive filter and impact of a transmit booster amplifier

Peter J. Winzer, Andras Kalmar

Author Affiliations +

Proceedings Volume 3615, Free-Space Laser Communication Technologies XI; (1999) https://doi.org/10.1117/12.346171
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

A theory for the signal-to-noise ratio of optical direct detection receivers employing return-to-zero coding (and possibly optical preamplification) is developed. The results are valid for both signal-independent noise limited and signal-dependent noise limited receivers, as well as for arbitrary optical pulse shapes and receive filter characteristics, taking into account intersymbol interference. Even if the same receiver bandwidth is used, return-to-zero coding is seen to yield higher signal-to-noise ratio than nonreturn-to-zero coding. Asymptotic expressions for the signal-to-noise ratio for very high and very low receiver bandwidths show that the full sensitivity enhancement potential of return-to-zero coding is exhausted at fairly moderate duty cycles. A realistic example taking into account inter-symbol interference shows that a receiver sensitivity gain (compared to nonreturn-to-zero coding) of e.g. 3.2 dB can be obtained in a signal-independent noise limited receiver with a bandwidth of 80% of the data rate, using a duty cycle of 3. For the signal-independent noise limited case, the sensitivity enhancement potential depends on the receive filter characteristics; we provide a design rule for filters with high sensitivity enhancement potential. Further, we investigate the role of rare-earth doped booster amplifiers in impulsively coded communication links: It is shown that, due to the average power limitation of these devices, a less powerful booster amplifier as with nonreturn-to-zero coding can be employed if certain conditions regarding the data rate and the return-to-zero duty cycle are met.

Citation Download Citation

Peter J. Winzer and Andras Kalmar "Impulsive coding in optical free-space links: optimum choice of the receive filter and impact of a transmit booster amplifier", Proc. SPIE 3615, Free-Space Laser Communication Technologies XI, (26 April 1999); https://doi.org/10.1117/12.346171

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available