Amplification of a bi-phase shift-key modulated signal by a mm-wave FEL

Conference · Tue Oct 01 00:00:00 EDT 1991

OSTI ID:5156198

Prosnitz, D; Scharlemann, E T; Sheaffer, M K

Bi-phase shift keying (BPSK) is a modulation scheme used in communications and radar in which the phase of a transmitted rf signal is switched in a coded pattern between discrete values differing by {pi} radians. The transmitted information rate (in communications) or resolution (in imaging radar) depends on the rate at which the transmitted signal can be modulated. Modulation rates of greater than 1 GHz are generally desired. Although the instantaneous gain bandwidth of a mm-wave FEL amplifier can be much greater than 10 GHz, slippage may limit the BPSK modulation rate that can be amplified. Qualitative slippage arguments would limit the modulation rate to relatively low values; nevertheless, simulations with a time-dependent FEL code (GINGER) indicate that rates of 2 GHz or more are amplified without much loss in modulation integrity. In this paper we describe the effects of slippage in the simulations and discuss the limits of simple arguments.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5156198
• Report Number(s): UCRL-JC-107200; CONF-9108118-18; ON: DE92002177
• Resource Relation: Conference: 13. international free-electron laser (FEL) conference, Santa Fe, NM (United States), 25-30 Aug 1991
• Country of Publication: United States
• Language: English

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