{"title":"使用外部调制器的20ghz光模拟链路","authors":"G. Betts, C. Cox, K. Ray","doi":"10.1109/baods.1990.205501","DOIUrl":null,"url":null,"abstract":"An optical analog link operating at 20 GHz with a 3-dB bandwidth of 5.2 GHz was demonstrated. This link has an intermodulation-free dynamic range of 108 dB-Hz/sup 2/3/ and a maximum signal-to-noise ratio (SNR) of 155 dB-Hz. Previously reported direct modulation analog links have not been able to operate at 20 GHz and, even in the 10-GHz frequency range, have had 20-30-dB-poorer SNRs; externally modulated links are capable of high-frequency operation but have demonstrated 30-50-dB-poorer SNRs than the present link. The link consists of a CW laser, an integrated-optical intensity modulator, and a p-i-n diode detector connected by fibers; it contains no amplifiers. The link performance is evaluated at the RF ports, i.e. it is treated as a two-port RF device. It is noted that by simply using a detector with no rolloff and by reducing the modulator excess optical insertion loss to 3 dB, the RF insertion loss can be improved to -25 dB and the noise figure to 33 dB.<<ETX>>","PeriodicalId":119716,"journal":{"name":"LEOS Summer Topical on Broadband Analog Optoelectronics: Devices and Systems","volume":"337 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":"{\"title\":\"20-GHz optical analog link using an external modulator\",\"authors\":\"G. Betts, C. Cox, K. Ray\",\"doi\":\"10.1109/baods.1990.205501\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"An optical analog link operating at 20 GHz with a 3-dB bandwidth of 5.2 GHz was demonstrated. This link has an intermodulation-free dynamic range of 108 dB-Hz/sup 2/3/ and a maximum signal-to-noise ratio (SNR) of 155 dB-Hz. Previously reported direct modulation analog links have not been able to operate at 20 GHz and, even in the 10-GHz frequency range, have had 20-30-dB-poorer SNRs; externally modulated links are capable of high-frequency operation but have demonstrated 30-50-dB-poorer SNRs than the present link. The link consists of a CW laser, an integrated-optical intensity modulator, and a p-i-n diode detector connected by fibers; it contains no amplifiers. The link performance is evaluated at the RF ports, i.e. it is treated as a two-port RF device. It is noted that by simply using a detector with no rolloff and by reducing the modulator excess optical insertion loss to 3 dB, the RF insertion loss can be improved to -25 dB and the noise figure to 33 dB.<<ETX>>\",\"PeriodicalId\":119716,\"journal\":{\"name\":\"LEOS Summer Topical on Broadband Analog Optoelectronics: Devices and Systems\",\"volume\":\"337 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1900-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"8\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"LEOS Summer Topical on Broadband Analog Optoelectronics: Devices and Systems\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/baods.1990.205501\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"LEOS Summer Topical on Broadband Analog Optoelectronics: Devices and Systems","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/baods.1990.205501","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
20-GHz optical analog link using an external modulator
An optical analog link operating at 20 GHz with a 3-dB bandwidth of 5.2 GHz was demonstrated. This link has an intermodulation-free dynamic range of 108 dB-Hz/sup 2/3/ and a maximum signal-to-noise ratio (SNR) of 155 dB-Hz. Previously reported direct modulation analog links have not been able to operate at 20 GHz and, even in the 10-GHz frequency range, have had 20-30-dB-poorer SNRs; externally modulated links are capable of high-frequency operation but have demonstrated 30-50-dB-poorer SNRs than the present link. The link consists of a CW laser, an integrated-optical intensity modulator, and a p-i-n diode detector connected by fibers; it contains no amplifiers. The link performance is evaluated at the RF ports, i.e. it is treated as a two-port RF device. It is noted that by simply using a detector with no rolloff and by reducing the modulator excess optical insertion loss to 3 dB, the RF insertion loss can be improved to -25 dB and the noise figure to 33 dB.<>