| Presentation | 1996/7/25 All-optical Pulse Code Division Multiple Access Utilizing Homodyne Correlation Detection Wei HUNG, Kin-ichi KITAYAMA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Almost conventional optical pulse code division multiple access (CDMA), using a passive optical matched filter detection (MFD), has some fundamental differences between a more standard radio spread spectrum (SS) CDMA. In this paper,a novel all-optical pulse code division multiple access (CDMA) utilizing homodyne correlation detection (HCD) is proposed. Each CDMA transmitter generates an optical pulse code sequence by an optical encoder consisting of pulse laser and optical delay line elements. Electrical information data is imprinted upon the optical pulse sequence by an electro-optic modulation(EOM). With a pulse local oscillator (LO), the receiver includes a HCD process as follows: the same code as the transmitter is locally generated, the generated code is multiplied synchronously the receiver signal chip by chip via a 3dB coupler, followed by a balanced detector and a threshold comparison is implemented after integrating the photo-current from the detector over one bit interval. The advantage of the proposed system is to implement the thresholding in bit rate rather than in chip rate as a conventional optical pulse CDMA with MFD. Without requiring LO at the receiver, a modified system is also proposed. In the system,each user transmits its information data bits with two code sequences multiplexed alternately in time domain. The receiver uses a self-HCD. It permits to implement the system in bit rate without the information of the chip clock and avoids the issues such as phase drift and frequency stability of LO. In the paper, the systems are analyzed theoretically and the numerical results are given by using bipolar code. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | optical CDMA / optical pulse code / homodyne correlation detection |
| Paper # | OCS96-27 |
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| Conference Information | |
| Committee | OCS |
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| Conference Date | 1996/7/25(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Optical Communication Systems (OCS) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | All-optical Pulse Code Division Multiple Access Utilizing Homodyne Correlation Detection |
| Sub Title (in English) | |
| Keyword(1) | optical CDMA |
| Keyword(2) | optical pulse code |
| Keyword(3) | homodyne correlation detection |
| 1st Author's Name | Wei HUNG |
| 1st Author's Affiliation | Communications Research Laboratory Ministry of Posts and Telecommunications, Japan() |
| 2nd Author's Name | Kin-ichi KITAYAMA |
| 2nd Author's Affiliation | Communications Research Laboratory Ministry of Posts and Telecommunications, Japan |
| Date | 1996/7/25 |
| Paper # | OCS96-27 |
| Volume (vol) | vol.96 |
| Number (no) | 188 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |